miku/.gitignore

## .gitignore
xmlp

## README.md

      
    Raw
  

              README.md
            
          
    Parallel XML processing

When working with large XML files, only a streaming approach is feasible, which also helps to work on the data in parallel, since only one record needs to be cosidered at a time.
First version of wikikit parsed the XML element in the main routine and the fan out the parsed struct to the workers. Thanks to pprof, it got clear, why this did not yield major speed improvements - most time was spent in converting a XML token into a struct.
Single routine, tokenization only

Needs about 6.268s to decode and parse 10000 XML elements.
Skipping struct parsing:
decoder := xml.NewDecoder(handle)
var inElement string

for {
	t, _ := decoder.Token()
	if t == nil {
		break
	}
	switch se := t.(type) {
	case xml.StartElement:
		inElement = se.Name.Local
		if inElement == "page" {
			// ...
		}
	default:
	}
}

gets the speed down to 0.433s. Just tokenizing through a 34G XML file with
a single routine takes 39m21.517s saturating a single core.
Time distribution looks like this: https://cdn.mediacru.sh/DYyiKLBA7U2i.svg
Single routine, struct loading

decoder := xml.NewDecoder(handle)
var inElement string
var p Page

for {
	// Read tokens from the XML document in a stream.
	t, _ := decoder.Token()
	if t == nil {
		break
	}
	// Inspect the type of the token just read.
	switch se := t.(type) {
	case xml.StartElement:
		// If we just read a StartElement token
		inElement = se.Name.Local
		// ...and its name is "page"
		if inElement == "page" {
			// decode a whole chunk of following XML into the
			// variable p which is a Page (se above)
			decoder.DecodeElement(&p, &se)
		}
	default:
	}
}

Observation

Most time is spent actually getting the token out. DecodeElement is not
unsignificant. Grepping for </page> in 34G takes finds 15671705 occurences
and takes about 16m35.992s.
Distributing decoder.Token() among workers seems not that easy. Workaround
could be to

split the file into N pieces, while preserving the XML structure,
write the N pieces to N files,
convert each file in a separate routine,
concatenate the result into a single file.


## inspect.sh
#!/usr/bin/env bash
go tool pprof --web xmlp $1

## Makefile
all:
	go fmt xmlp.go
	go build xmlp.go

clean:
	rm -f xmlp

## v0.svg

      
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## v2.svg
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
 "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.26.3 (20100126.1600)
 -->
<!-- Title: xmlp; 197453 samples Pages: 1 -->
<svg width="100%" height="100%"
  xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<script type="text/ecmascript"><![CDATA[
// SVGPan
// http://www.cyberz.org/blog/2009/12/08/svgpan-a-javascript-svg-panzoomdrag-library/
// Local modification: if(true || ...) below to force panning, never moving.
// Local modification: add clamping to fix bug in handleMouseWheel.

/**
 *  SVGPan library 1.2
 * ====================
 *
 * Given an unique existing element with id "viewport", including the
 * the library into any SVG adds the following capabilities:
 *
 *  - Mouse panning
 *  - Mouse zooming (using the wheel)
 *  - Object dargging
 *
 * Known issues:
 *
 *  - Zooming (while panning) on Safari has still some issues
 *
 * Releases:
 *
 * 1.2, Sat Mar 20 08:42:50 GMT 2010, Zeng Xiaohui
 *	Fixed a bug with browser mouse handler interaction
 *
 * 1.1, Wed Feb  3 17:39:33 GMT 2010, Zeng Xiaohui
 *	Updated the zoom code to support the mouse wheel on Safari/Chrome
 *
 * 1.0, Andrea Leofreddi
 *	First release
 *
 * This code is licensed under the following BSD license:
 *
 * Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com>. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of Andrea Leofreddi.
 */

var root = document.documentElement;

var state = 'none', stateTarget, stateOrigin, stateTf;

setupHandlers(root);

/**
 * Register handlers
 */
function setupHandlers(root){
	setAttributes(root, {
		"onmouseup" : "add(evt)",
		"onmousedown" : "handleMouseDown(evt)",
		"onmousemove" : "handleMouseMove(evt)",
		"onmouseup" : "handleMouseUp(evt)",
		//"onmouseout" : "handleMouseUp(evt)", // Decomment this to stop the pan functionality when dragging out of the SVG element
	});

	if(navigator.userAgent.toLowerCase().indexOf('webkit') >= 0)
		window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari
	else
		window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others

	var g = svgDoc.getElementById("svg");
	g.width = "100%";
	g.height = "100%";
}

/**
 * Instance an SVGPoint object with given event coordinates.
 */
function getEventPoint(evt) {
	var p = root.createSVGPoint();

	p.x = evt.clientX;
	p.y = evt.clientY;

	return p;
}

/**
 * Sets the current transform matrix of an element.
 */
function setCTM(element, matrix) {
	var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";

	element.setAttribute("transform", s);
}

/**
 * Dumps a matrix to a string (useful for debug).
 */
function dumpMatrix(matrix) {
	var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n  " + matrix.b + ", " + matrix.d + ", " + matrix.f + "\n  0, 0, 1 ]";

	return s;
}

/**
 * Sets attributes of an element.
 */
function setAttributes(element, attributes){
	for (i in attributes)
		element.setAttributeNS(null, i, attributes[i]);
}

/**
 * Handle mouse move event.
 */
function handleMouseWheel(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	var delta;

	if(evt.wheelDelta)
		delta = evt.wheelDelta / 3600; // Chrome/Safari
	else
		delta = evt.detail / -90; // Mozilla

	var z = 1 + delta; // Zoom factor: 0.9/1.1

	// Clamp to reasonable values.
	// The 0.1 check is important because
	// a very large scroll can turn into a
	// negative z, which rotates the image 180 degrees.
	if(z < 0.1)
		z = 0.1;
	if(z > 10.0)
		z = 10.0;

	var g = svgDoc.getElementById("viewport");

	var p = getEventPoint(evt);

	p = p.matrixTransform(g.getCTM().inverse());

	// Compute new scale matrix in current mouse position
	var k = root.createSVGMatrix().translate(p.x, p.y).scale(z).translate(-p.x, -p.y);

        setCTM(g, g.getCTM().multiply(k));

	stateTf = stateTf.multiply(k.inverse());
}

/**
 * Handle mouse move event.
 */
function handleMouseMove(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	var g = svgDoc.getElementById("viewport");

	if(state == 'pan') {
		// Pan mode
		var p = getEventPoint(evt).matrixTransform(stateTf);

		setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y));
	} else if(state == 'move') {
		// Move mode
		var p = getEventPoint(evt).matrixTransform(g.getCTM().inverse());

		setCTM(stateTarget, root.createSVGMatrix().translate(p.x - stateOrigin.x, p.y - stateOrigin.y).multiply(g.getCTM().inverse()).multiply(stateTarget.getCTM()));

		stateOrigin = p;
	}
}

/**
 * Handle click event.
 */
function handleMouseDown(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	var g = svgDoc.getElementById("viewport");

	if(true || evt.target.tagName == "svg") {
		// Pan mode
		state = 'pan';

		stateTf = g.getCTM().inverse();

		stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
	} else {
		// Move mode
		state = 'move';

		stateTarget = evt.target;

		stateTf = g.getCTM().inverse();

		stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
	}
}

/**
 * Handle mouse button release event.
 */
function handleMouseUp(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	if(state == 'pan' || state == 'move') {
		// Quit pan mode
		state = '';
	}
}

]]></script>
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<title>xmlp; 197453 samples</title>
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<!-- N5&#45;&gt;N6 -->
<g id="edge12" class="edge"><title>N5&#45;&gt;N6</title>
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<!-- N5&#45;&gt;N9 -->
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<g id="edge164" class="edge"><title>N5&#45;&gt;N16</title>
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<!-- N5&#45;&gt;N24 -->
<g id="edge144" class="edge"><title>N5&#45;&gt;N24</title>
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<!-- N6&#45;&gt;N8 -->
<g id="edge14" class="edge"><title>N6&#45;&gt;N8</title>
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<!-- N6&#45;&gt;N11 -->
<g id="edge46" class="edge"><title>N6&#45;&gt;N11</title>
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<!-- N6&#45;&gt;N15 -->
<g id="edge134" class="edge"><title>N6&#45;&gt;N15</title>
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<!-- N6&#45;&gt;N18 -->
<g id="edge102" class="edge"><title>N6&#45;&gt;N18</title>
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<text text-anchor="end" x="990" y="-595.05" font-family="Times Roman,serif" font-size="10.50">of 6647 (3.4%)</text>
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<!-- N6&#45;&gt;N25 -->
<g id="edge22" class="edge"><title>N6&#45;&gt;N25</title>
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<text text-anchor="middle" x="563" y="-1192.66" font-family="Times Roman,serif" font-size="12.60">encoding/xml.(*Decoder).nsname</text>
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<!-- N6&#45;&gt;N27 -->
<g id="edge70" class="edge"><title>N6&#45;&gt;N27</title>
<path fill="none" stroke="black" d="M1373.91,-1283.28C1370.92,-1282.83 1367.95,-1282.4 1365,-1282 1233.04,-1264.06 896.212,-1291.92 766,-1264 716.801,-1253.45 664.4,-1231.47 625.162,-1212.64"/>
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<g id="node30" class="node"><title>N29</title>
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<text text-anchor="middle" x="737" y="-1190.68" font-family="Times Roman,serif" font-size="9.80">gostringsize</text>
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<!-- N6&#45;&gt;N29 -->
<g id="edge36" class="edge"><title>N6&#45;&gt;N29</title>
<path fill="none" stroke="black" d="M1373.91,-1283.3C1370.92,-1282.84 1367.95,-1282.41 1365,-1282 1306.96,-1273.99 893.354,-1283.2 838,-1264 808.706,-1253.84 782.041,-1230.78 763.474,-1211.39"/>
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<!-- N6&#45;&gt;N36 -->
<g id="edge120" class="edge"><title>N6&#45;&gt;N36</title>
<path fill="none" stroke="black" d="M1748.06,-1313.11C1879.85,-1298.22 2059.47,-1271.89 2213,-1228 2226.74,-1224.07 2241.03,-1218.91 2254.64,-1213.43"/>
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<!-- N6&#45;&gt;N41 -->
<g id="edge140" class="edge"><title>N6&#45;&gt;N41</title>
<path fill="none" stroke="black" d="M1373.63,-1282.62C1301.91,-1263.45 1229.35,-1242.47 1196,-1228 1185.52,-1223.46 1174.77,-1217.73 1164.7,-1211.83"/>
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<text text-anchor="middle" x="1669" y="-1190.77" font-family="Times Roman,serif" font-size="9.70">strings.explode</text>
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<!-- N6&#45;&gt;N51 -->
<g id="edge110" class="edge"><title>N6&#45;&gt;N51</title>
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<g id="node54" class="node"><title>N53</title>
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<text text-anchor="end" x="1863" y="-1163.28" font-family="Times Roman,serif" font-size="10.80">of 1053 (0.5%)</text>
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<!-- N6&#45;&gt;N53 -->
<g id="edge146" class="edge"><title>N6&#45;&gt;N53</title>
<path fill="none" stroke="black" d="M1637.27,-1282.33C1674.94,-1258.79 1719.28,-1231.08 1752.3,-1210.44"/>
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<!-- N7&#45;&gt;N6 -->
<g id="edge90" class="edge"><title>N7&#45;&gt;N6</title>
<path fill="none" stroke="black" d="M1937.82,-1038.26C1791.11,-1050.75 1618.29,-1077 1570,-1132 1536.93,-1169.66 1538.58,-1228.57 1546.14,-1272.35"/>
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<!-- N7&#45;&gt;N7 -->
<g id="edge30" class="edge"><title>N7&#45;&gt;N7</title>
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<!-- N19 -->
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<text text-anchor="end" x="2048.5" y="-868.8" font-family="Times Roman,serif" font-size="18.00">7959 (4.0%)</text>
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<!-- N7&#45;&gt;N19 -->
<g id="edge44" class="edge"><title>N7&#45;&gt;N19</title>
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<!-- N20 -->
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<text text-anchor="end" x="2244.5" y="-879.89" font-family="Times Roman,serif" font-size="17.90">7674 (3.9%)</text>
<text text-anchor="end" x="2244.5" y="-857.89" font-family="Times Roman,serif" font-size="17.90">of 7790 (3.9%)</text>
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<!-- N7&#45;&gt;N20 -->
<g id="edge86" class="edge"><title>N7&#45;&gt;N20</title>
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<!-- N7&#45;&gt;N22 -->
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<!-- N42 -->
<g id="node43" class="node"><title>N42</title>
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<text text-anchor="end" x="1753.5" y="-868.37" font-family="Times Roman,serif" font-size="10.70">of 2698 (1.4%)</text>
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<!-- N7&#45;&gt;N42 -->
<g id="edge82" class="edge"><title>N7&#45;&gt;N42</title>
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<!-- N8&#45;&gt;N15 -->
<g id="edge74" class="edge"><title>N8&#45;&gt;N15</title>
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<!-- N30 -->
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<text text-anchor="end" x="1500.5" y="-1012.15" font-family="Times Roman,serif" font-size="16.50">5761 (2.9%)</text>
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<!-- N8&#45;&gt;N30 -->
<g id="edge50" class="edge"><title>N8&#45;&gt;N30</title>
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<!-- N9&#45;&gt;N7 -->
<g id="edge92" class="edge"><title>N9&#45;&gt;N7</title>
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<!-- N9&#45;&gt;N15 -->
<g id="edge142" class="edge"><title>N9&#45;&gt;N15</title>
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<!-- N10 -->
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<text text-anchor="end" x="934.5" y="-430.72" font-family="Times Roman,serif" font-size="19.20">9852 (5.0%)</text>
<text text-anchor="end" x="934.5" y="-406.72" font-family="Times Roman,serif" font-size="19.20">of 19307 (9.8%)</text>
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<!-- N31 -->
<g id="node32" class="node"><title>N31</title>
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<text text-anchor="end" x="828.5" y="-316.76" font-family="Times Roman,serif" font-size="8.60">24 (0.0%)</text>
<text text-anchor="end" x="828.5" y="-305.76" font-family="Times Roman,serif" font-size="8.60">of 4932 (2.5%)</text>
</g>
<!-- N10&#45;&gt;N31 -->
<g id="edge114" class="edge"><title>N10&#45;&gt;N31</title>
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<!-- N34 -->
<g id="node35" class="node"><title>N34</title>
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<text text-anchor="middle" x="910" y="-323.96" font-family="Times Roman,serif" font-size="15.60">gc</text>
<text text-anchor="end" x="958.5" y="-304.96" font-family="Times Roman,serif" font-size="15.60">4524 (2.3%)</text>
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<!-- N10&#45;&gt;N34 -->
<g id="edge128" class="edge"><title>N10&#45;&gt;N34</title>
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<!-- N12 -->
<g id="node13" class="node"><title>N12</title>
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<text text-anchor="end" x="498" y="-1023.44" font-family="Times Roman,serif" font-size="13.40">2265 (1.1%)</text>
<text text-anchor="end" x="498" y="-1006.44" font-family="Times Roman,serif" font-size="13.40">of 13757 (7.0%)</text>
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<!-- N11&#45;&gt;N12 -->
<g id="edge104" class="edge"><title>N11&#45;&gt;N12</title>
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<!-- N13 -->
<g id="node14" class="node"><title>N13</title>
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<text text-anchor="middle" x="153" y="-1044.61" font-family="Times Roman,serif" font-size="17.10">unicode/utf8.decodeRuneInternal</text>
<text text-anchor="end" x="298" y="-1022.61" font-family="Times Roman,serif" font-size="17.10">6515 (3.3%)</text>
<text text-anchor="end" x="298" y="-1000.61" font-family="Times Roman,serif" font-size="17.10">of 13465 (6.8%)</text>
</g>
<!-- N11&#45;&gt;N13 -->
<g id="edge132" class="edge"><title>N11&#45;&gt;N13</title>
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<!-- N48 -->
<g id="node49" class="node"><title>N48</title>
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<text text-anchor="middle" x="603" y="-1031.75" font-family="Times Roman,serif" font-size="12.50">sync.(*RWMutex).Lock</text>
<text text-anchor="end" x="674" y="-1015.75" font-family="Times Roman,serif" font-size="12.50">1606 (0.8%)</text>
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<!-- N11&#45;&gt;N48 -->
<g id="edge42" class="edge"><title>N11&#45;&gt;N48</title>
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<!-- N26 -->
<g id="node27" class="node"><title>N26</title>
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<text text-anchor="middle" x="415" y="-891.61" font-family="Times Roman,serif" font-size="17.10">sync.(*RWMutex).RUnlock</text>
<text text-anchor="end" x="528.5" y="-869.61" font-family="Times Roman,serif" font-size="17.10">6549 (3.3%)</text>
</g>
<!-- N12&#45;&gt;N26 -->
<g id="edge116" class="edge"><title>N12&#45;&gt;N26</title>
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<!-- N35 -->
<g id="node36" class="node"><title>N35</title>
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<text text-anchor="middle" x="658" y="-890.14" font-family="Times Roman,serif" font-size="15.40">sync.(*RWMutex).RLock</text>
<text text-anchor="end" x="754" y="-871.14" font-family="Times Roman,serif" font-size="15.40">4293 (2.2%)</text>
</g>
<!-- N12&#45;&gt;N35 -->
<g id="edge138" class="edge"><title>N12&#45;&gt;N35</title>
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<!-- N23 -->
<g id="node24" class="node"><title>N23</title>
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<text text-anchor="middle" x="153" y="-891.34" font-family="Times Roman,serif" font-size="17.40">unicode.init</text>
<text text-anchor="end" x="207.5" y="-869.34" font-family="Times Roman,serif" font-size="17.40">6950 (3.5%)</text>
</g>
<!-- N13&#45;&gt;N23 -->
<g id="edge126" class="edge"><title>N13&#45;&gt;N23</title>
<path fill="none" stroke="black" d="M153,-989.691C153,-968.602 153,-942.351 153,-921.412"/>
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<g id="node15" class="node"><title>N14</title>
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<text text-anchor="end" x="860.5" y="-1006.8" font-family="Times Roman,serif" font-size="13.00">of 13389 (6.8%)</text>
</g>
<!-- N14&#45;&gt;N10 -->
<g id="edge34" class="edge"><title>N14&#45;&gt;N10</title>
<path fill="none" stroke="black" d="M797,-997.355C797,-968.628 797,-923.828 797,-885 797,-885 797,-885 797,-611 797,-569.149 797,-521.668 797,-486.733"/>
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<g id="node45" class="node"><title>N44</title>
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<text text-anchor="middle" x="1027" y="-449.44" font-family="Times Roman,serif" font-size="13.40">vdso_find_version</text>
<text text-anchor="end" x="1086" y="-432.44" font-family="Times Roman,serif" font-size="13.40">2320 (1.2%)</text>
<text text-anchor="end" x="1086" y="-415.44" font-family="Times Roman,serif" font-size="13.40">of 2492 (1.3%)</text>
</g>
<!-- N14&#45;&gt;N44 -->
<g id="edge28" class="edge"><title>N14&#45;&gt;N44</title>
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<g id="node47" class="node"><title>N46</title>
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<text text-anchor="middle" x="1181" y="-449.02" font-family="Times Roman,serif" font-size="12.20">vdso_parse_symbols</text>
<text text-anchor="end" x="1242.5" y="-433.02" font-family="Times Roman,serif" font-size="12.20">1384 (0.7%)</text>
<text text-anchor="end" x="1242.5" y="-417.02" font-family="Times Roman,serif" font-size="12.20">of 2024 (1.0%)</text>
</g>
<!-- N14&#45;&gt;N46 -->
<g id="edge94" class="edge"><title>N14&#45;&gt;N46</title>
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<!-- N15&#45;&gt;N15 -->
<g id="edge56" class="edge"><title>N15&#45;&gt;N15</title>
<path fill="none" stroke="black" d="M1326.17,-1038.19C1337.18,-1035.76 1344,-1032.03 1344,-1027 1344,-1023.7 1341.06,-1020.96 1335.93,-1018.78"/>
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<!-- N16&#45;&gt;N13 -->
<g id="edge122" class="edge"><title>N16&#45;&gt;N13</title>
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<g id="node18" class="node"><title>N17</title>
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<text text-anchor="end" x="2277" y="-2016.8" font-family="Times Roman,serif" font-size="8.00">of 9654 (4.9%)</text>
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<!-- N38 -->
<g id="node39" class="node"><title>N38</title>
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<!-- N17&#45;&gt;N38 -->
<g id="edge16" class="edge"><title>N17&#45;&gt;N38</title>
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<!-- N40 -->
<g id="node41" class="node"><title>N40</title>
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<text text-anchor="middle" x="2238" y="-1876.4" font-family="Times Roman,serif" font-size="14.00">addroots</text>
<text text-anchor="end" x="2282" y="-1858.4" font-family="Times Roman,serif" font-size="14.00">2831 (1.4%)</text>
</g>
<!-- N17&#45;&gt;N40 -->
<g id="edge106" class="edge"><title>N17&#45;&gt;N40</title>
<path fill="none" stroke="black" d="M2238,-2009.94C2238,-1983.54 2238,-1935.48 2238,-1903.39"/>
<polygon fill="black" stroke="black" points="2241.5,-1903.17 2238,-1893.17 2234.5,-1903.17 2241.5,-1903.17"/>
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<!-- N49 -->
<g id="node50" class="node"><title>N49</title>
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<text text-anchor="middle" x="2386" y="-1882.7" font-family="Times Roman,serif" font-size="12.00">syscall.(*Errno).Timeout</text>
<text text-anchor="end" x="2456" y="-1867.7" font-family="Times Roman,serif" font-size="12.00">1277 (0.6%)</text>
<text text-anchor="end" x="2456" y="-1852.7" font-family="Times Roman,serif" font-size="12.00">of 1324 (0.7%)</text>
</g>
<!-- N17&#45;&gt;N49 -->
<g id="edge98" class="edge"><title>N17&#45;&gt;N49</title>
<path fill="none" stroke="black" d="M2255.85,-2009.94C2280.12,-1984.03 2323.94,-1937.25 2353.98,-1905.19"/>
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</g>
<!-- N18&#45;&gt;N14 -->
<g id="edge24" class="edge"><title>N18&#45;&gt;N14</title>
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<!-- N21 -->
<g id="node22" class="node"><title>N21</title>
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<text text-anchor="middle" x="1536" y="-622.28" font-family="Times Roman,serif" font-size="10.80">runtime.persistentalloc</text>
<text text-anchor="end" x="1595.5" y="-608.28" font-family="Times Roman,serif" font-size="10.80">600 (0.3%)</text>
<text text-anchor="end" x="1595.5" y="-594.28" font-family="Times Roman,serif" font-size="10.80">of 7640 (3.9%)</text>
</g>
<!-- N21&#45;&gt;N10 -->
<g id="edge60" class="edge"><title>N21&#45;&gt;N10</title>
<path fill="none" stroke="black" d="M1468.73,-608.447C1365.8,-602.353 1164.99,-581.732 1011,-512 999.175,-506.645 999.517,-499.988 988,-494 976.484,-488.013 964.249,-482.536 951.753,-477.549"/>
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</g>
<!-- N21&#45;&gt;N44 -->
<g id="edge76" class="edge"><title>N21&#45;&gt;N44</title>
<path fill="none" stroke="black" d="M1468.64,-594.095C1382.33,-571.509 1228.82,-528.213 1103,-476 1098.58,-474.168 1094.08,-472.167 1089.59,-470.068"/>
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</g>
<!-- N21&#45;&gt;N46 -->
<g id="edge58" class="edge"><title>N21&#45;&gt;N46</title>
<path fill="none" stroke="black" d="M1485.14,-585.927C1422.48,-555.038 1315.89,-502.494 1246.98,-468.527"/>
<polygon fill="black" stroke="black" points="1248.45,-465.35 1237.94,-464.067 1245.36,-471.628 1248.45,-465.35"/>
<text text-anchor="middle" x="1345.5" y="-499.4" font-family="Times Roman,serif" font-size="14.00">1037</text>
</g>
<!-- N28 -->
<g id="node29" class="node"><title>N28</title>
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<text text-anchor="middle" x="2321" y="-780.14" font-family="Times Roman,serif" font-size="10.40">runtime.mapiter2</text>
<text text-anchor="end" x="2365.5" y="-767.14" font-family="Times Roman,serif" font-size="10.40">451 (0.2%)</text>
<text text-anchor="end" x="2365.5" y="-754.14" font-family="Times Roman,serif" font-size="10.40">of 6238 (3.2%)</text>
</g>
<!-- N22&#45;&gt;N28 -->
<g id="edge80" class="edge"><title>N22&#45;&gt;N28</title>
<path fill="none" stroke="black" d="M2321,-858.328C2321,-842.173 2321,-821.409 2321,-804.073"/>
<polygon fill="black" stroke="black" points="2324.5,-803.793 2321,-793.793 2317.5,-803.793 2324.5,-803.793"/>
<text text-anchor="middle" x="2339.5" y="-817.4" font-family="Times Roman,serif" font-size="14.00">6173</text>
</g>
<!-- N25&#45;&gt;N10 -->
<g id="edge64" class="edge"><title>N25&#45;&gt;N10</title>
<path fill="none" stroke="black" d="M925.905,-587.399C903.476,-561.055 866.58,-517.722 837.996,-484.15"/>
<polygon fill="black" stroke="black" points="840.441,-481.622 831.293,-476.277 835.111,-486.16 840.441,-481.622"/>
<text text-anchor="middle" x="877.5" y="-499.4" font-family="Times Roman,serif" font-size="14.00">4641</text>
</g>
<!-- N25&#45;&gt;N44 -->
<g id="edge154" class="edge"><title>N25&#45;&gt;N44</title>
<path fill="none" stroke="black" d="M943.989,-587.099C942.979,-562.348 944.456,-523.27 960,-494 964.045,-486.382 969.532,-479.32 975.635,-472.934"/>
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<text text-anchor="middle" x="974" y="-499.4" font-family="Times Roman,serif" font-size="14.00">583</text>
</g>
<!-- N25&#45;&gt;N46 -->
<g id="edge66" class="edge"><title>N25&#45;&gt;N46</title>
<path fill="none" stroke="black" d="M969.775,-587.295C999.758,-557.661 1049.93,-509 1071,-494 1075.69,-490.657 1095.61,-480.011 1117.24,-468.736"/>
<polygon fill="black" stroke="black" points="1118.98,-471.775 1126.24,-464.057 1115.75,-465.564 1118.98,-471.775"/>
<text text-anchor="middle" x="1085" y="-499.4" font-family="Times Roman,serif" font-size="14.00">237</text>
</g>
<!-- N27&#45;&gt;N12 -->
<g id="edge26" class="edge"><title>N27&#45;&gt;N12</title>
<path fill="none" stroke="black" d="M544.854,-1151.72C533.298,-1134.72 517.448,-1113.12 501,-1096 489.905,-1084.45 476.876,-1073.08 464.362,-1063"/>
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<text text-anchor="middle" x="535.5" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">3464</text>
</g>
<!-- N27&#45;&gt;N13 -->
<g id="edge162" class="edge"><title>N27&#45;&gt;N13</title>
<path fill="none" stroke="black" d="M491.241,-1151.87C458.461,-1138.49 423.704,-1123.4 409,-1114 398.925,-1107.56 399.576,-1101.58 389,-1096 359.067,-1080.2 347.605,-1087.09 315,-1078 302.665,-1074.56 289.852,-1070.82 277.079,-1066.98"/>
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<text text-anchor="middle" x="423" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">775</text>
</g>
<!-- N27&#45;&gt;N48 -->
<g id="edge166" class="edge"><title>N27&#45;&gt;N48</title>
<path fill="none" stroke="black" d="M570.337,-1151.94C577.376,-1125.01 587.972,-1084.48 595.172,-1056.94"/>
<polygon fill="black" stroke="black" points="598.607,-1057.64 597.75,-1047.08 591.835,-1055.87 598.607,-1057.64"/>
<text text-anchor="middle" x="599" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">466</text>
</g>
<!-- N28&#45;&gt;N21 -->
<g id="edge130" class="edge"><title>N28&#45;&gt;N21</title>
<path fill="none" stroke="black" d="M2268.89,-759.444C2133.93,-732.11 1772.52,-658.906 1613.22,-626.641"/>
<polygon fill="black" stroke="black" points="1613.52,-623.131 1603.03,-624.576 1612.13,-629.992 1613.52,-623.131"/>
<text text-anchor="middle" x="2129.5" y="-715.4" font-family="Times Roman,serif" font-size="14.00">4540</text>
</g>
<!-- N52 -->
<g id="node53" class="node"><title>N52</title>
<polygon fill="none" stroke="black" points="2373,-692 2269,-692 2269,-530 2373,-530 2373,-692"/>
<text text-anchor="middle" x="2321" y="-678.37" font-family="Times Roman,serif" font-size="10.70">type..hash.struct</text>
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<text text-anchor="middle" x="2321" y="-650.37" font-family="Times Roman,serif" font-size="10.70">Size</text>
<text text-anchor="middle" x="2321" y="-636.37" font-family="Times Roman,serif" font-size="10.70">uint32;</text>
<text text-anchor="middle" x="2321" y="-622.37" font-family="Times Roman,serif" font-size="10.70">Mallocs</text>
<text text-anchor="middle" x="2321" y="-608.37" font-family="Times Roman,serif" font-size="10.70">uint64;</text>
<text text-anchor="middle" x="2321" y="-594.37" font-family="Times Roman,serif" font-size="10.70">Frees</text>
<text text-anchor="middle" x="2321" y="-580.37" font-family="Times Roman,serif" font-size="10.70">uint64</text>
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<text text-anchor="end" x="2365" y="-552.37" font-family="Times Roman,serif" font-size="10.70">573 (0.3%)</text>
<text text-anchor="end" x="2365" y="-538.37" font-family="Times Roman,serif" font-size="10.70">of 1084 (0.5%)</text>
</g>
<!-- N28&#45;&gt;N52 -->
<g id="edge158" class="edge"><title>N28&#45;&gt;N52</title>
<path fill="none" stroke="black" d="M2321,-746.196C2321,-734.072 2321,-718.474 2321,-702.208"/>
<polygon fill="black" stroke="black" points="2324.5,-702.018 2321,-692.018 2317.5,-702.018 2324.5,-702.018"/>
<text text-anchor="middle" x="2335" y="-715.4" font-family="Times Roman,serif" font-size="14.00">839</text>
</g>
<!-- N29&#45;&gt;N14 -->
<g id="edge152" class="edge"><title>N29&#45;&gt;N14</title>
<path fill="none" stroke="black" d="M746.244,-1156.43C755.653,-1132.43 770.406,-1094.81 781.587,-1066.3"/>
<polygon fill="black" stroke="black" points="784.986,-1067.22 785.378,-1056.64 778.469,-1064.67 784.986,-1067.22"/>
<text text-anchor="middle" x="787.5" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">5782</text>
</g>
<!-- N32 -->
<g id="node33" class="node"><title>N32</title>
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<text text-anchor="middle" x="797" y="-229.85" font-family="Times Roman,serif" font-size="8.50">runtime.notesleep</text>
<text text-anchor="end" x="836.5" y="-218.85" font-family="Times Roman,serif" font-size="8.50">16 (0.0%)</text>
<text text-anchor="end" x="836.5" y="-207.85" font-family="Times Roman,serif" font-size="8.50">of 4728 (2.4%)</text>
</g>
<!-- N31&#45;&gt;N32 -->
<g id="edge18" class="edge"><title>N31&#45;&gt;N32</title>
<path fill="none" stroke="black" d="M797,-298.217C797,-284.834 797,-267.192 797,-252.149"/>
<polygon fill="black" stroke="black" points="800.5,-251.753 797,-241.753 793.5,-251.753 800.5,-251.753"/>
<text text-anchor="middle" x="815.5" y="-265.4" font-family="Times Roman,serif" font-size="14.00">4728</text>
</g>
<!-- N33 -->
<g id="node34" class="node"><title>N33</title>
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<text text-anchor="middle" x="797" y="-132.19" font-family="Times Roman,serif" font-size="10.90">runtime.MCentral_AllocList</text>
<text text-anchor="end" x="869.5" y="-118.19" font-family="Times Roman,serif" font-size="10.90">680 (0.3%)</text>
<text text-anchor="end" x="869.5" y="-104.19" font-family="Times Roman,serif" font-size="10.90">of 4526 (2.3%)</text>
</g>
<!-- N32&#45;&gt;N33 -->
<g id="edge100" class="edge"><title>N32&#45;&gt;N33</title>
<path fill="none" stroke="black" d="M797,-200.28C797,-187.666 797,-171.214 797,-156.569"/>
<polygon fill="black" stroke="black" points="800.5,-156.305 797,-146.305 793.5,-156.305 800.5,-156.305"/>
<text text-anchor="middle" x="815.5" y="-169.4" font-family="Times Roman,serif" font-size="14.00">4526</text>
</g>
<!-- N43 -->
<g id="node44" class="node"><title>N43</title>
<polygon fill="none" stroke="black" points="846,-42 748,-42 748,-2.13163e-14 846,-7.10543e-15 846,-42"/>
<text text-anchor="middle" x="797" y="-25.76" font-family="Times Roman,serif" font-size="13.60">runfinq</text>
<text text-anchor="end" x="838" y="-8.76" font-family="Times Roman,serif" font-size="13.60">2509 (1.3%)</text>
</g>
<!-- N33&#45;&gt;N43 -->
<g id="edge84" class="edge"><title>N33&#45;&gt;N43</title>
<path fill="none" stroke="black" d="M797,-95.7658C797,-82.5792 797,-66.318 797,-52.3321"/>
<polygon fill="black" stroke="black" points="800.5,-52.1692 797,-42.1692 793.5,-52.1693 800.5,-52.1692"/>
<text text-anchor="middle" x="815.5" y="-65.4" font-family="Times Roman,serif" font-size="14.00">2418</text>
</g>
<!-- N50 -->
<g id="node51" class="node"><title>N50</title>
<polygon fill="none" stroke="black" points="992,-41.5 864,-41.5 864,-0.5 992,-0.5 992,-41.5"/>
<text text-anchor="middle" x="928" y="-29.67" font-family="Times Roman,serif" font-size="8.70">runtime.setblockspecial</text>
<text text-anchor="end" x="984" y="-18.67" font-family="Times Roman,serif" font-size="8.70">44 (0.0%)</text>
<text text-anchor="end" x="984" y="-7.67" font-family="Times Roman,serif" font-size="8.70">of 1310 (0.7%)</text>
</g>
<!-- N33&#45;&gt;N50 -->
<g id="edge136" class="edge"><title>N33&#45;&gt;N50</title>
<path fill="none" stroke="black" d="M830.057,-95.7658C849.29,-81.0839 873.516,-62.5905 893.062,-47.6699"/>
<polygon fill="black" stroke="black" points="895.3,-50.3654 901.125,-41.5156 891.052,-44.8013 895.3,-50.3654"/>
<text text-anchor="middle" x="893.5" y="-65.4" font-family="Times Roman,serif" font-size="14.00">1310</text>
</g>
<!-- N37&#45;&gt;N7 -->
<g id="edge40" class="edge"><title>N37&#45;&gt;N7</title>
<path fill="none" stroke="black" d="M2624.51,-1156.21C2604.01,-1136.9 2572.52,-1110.56 2540,-1096 2512.6,-1083.73 2457.69,-1071.54 2398.05,-1060.89"/>
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<text text-anchor="middle" x="2584" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">725</text>
</g>
<!-- N37&#45;&gt;N22 -->
<g id="edge148" class="edge"><title>N37&#45;&gt;N22</title>
<path fill="none" stroke="black" d="M2637.97,-1156.5C2629.78,-1138.82 2617.12,-1114.57 2602,-1096 2538.58,-1018.11 2440.5,-953.125 2378.58,-916.67"/>
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<text text-anchor="middle" x="2603.5" y="-1023.4" font-family="Times Roman,serif" font-size="14.00">2326</text>
</g>
<!-- N39&#45;&gt;N4 -->
<g id="edge160" class="edge"><title>N39&#45;&gt;N4</title>
<path fill="none" stroke="black" d="M1898.85,-1644.48C1914.67,-1630.62 1934.99,-1612.82 1952.7,-1597.3"/>
<polygon fill="black" stroke="black" points="1955.41,-1599.58 1960.63,-1590.36 1950.8,-1594.31 1955.41,-1599.58"/>
<text text-anchor="middle" x="1954" y="-1613.4" font-family="Times Roman,serif" font-size="14.00">458</text>
</g>
<!-- N39&#45;&gt;N21 -->
<g id="edge6" class="edge"><title>N39&#45;&gt;N21</title>
<path fill="none" stroke="black" d="M1862.81,-1644.24C1844.25,-1591.8 1809.25,-1465.36 1873,-1396 1903.79,-1362.49 2039.48,-1403.76 2077,-1378 2116.16,-1351.11 2086.01,-1310.52 2124,-1282 2151.96,-1261.01 2411.5,-1254.76 2434,-1228 2461.46,-1195.34 2463.41,-1162.91 2434,-1132 2420.16,-1117.45 2092.97,-1116.11 2073,-1114 1952.78,-1101.3 1536,-1147.89 1536,-1027 1536,-1027 1536,-1027 1536,-770 1536,-727.467 1536,-678.534 1536,-646.313"/>
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<text text-anchor="middle" x="2474.5" y="-1176.4" font-family="Times Roman,serif" font-size="14.00">1024</text>
</g>
<!-- N41&#45;&gt;N15 -->
<g id="edge124" class="edge"><title>N41&#45;&gt;N15</title>
<path fill="none" stroke="black" d="M1116.5,-1153.15C1117.14,-1136.08 1119.76,-1113.91 1128,-1096 1133.36,-1084.34 1141.4,-1073.25 1149.92,-1063.51"/>
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<text text-anchor="middle" x="1142" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">581</text>
</g>
<!-- N41&#45;&gt;N30 -->
<g id="edge2" class="edge"><title>N41&#45;&gt;N30</title>
<path fill="none" stroke="black" d="M1147.33,-1153.44C1171.12,-1134.17 1205.98,-1109.25 1241,-1096 1299.68,-1073.8 1322.87,-1101.6 1381,-1078 1392.64,-1073.27 1404.06,-1066.05 1414.12,-1058.51"/>
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<text text-anchor="middle" x="1255" y="-1101.4" font-family="Times Roman,serif" font-size="14.00">303</text>
</g>
<!-- N42&#45;&gt;N42 -->
<g id="edge108" class="edge"><title>N42&#45;&gt;N42</title>
<path fill="none" stroke="black" d="M1761.15,-896.384C1771.62,-894.982 1779,-891.188 1779,-885 1779,-881.036 1775.97,-878.054 1771.04,-876.054"/>
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<text text-anchor="middle" x="1797.5" y="-881.4" font-family="Times Roman,serif" font-size="14.00">2154</text>
</g>
<!-- N45 -->
<g id="node46" class="node"><title>N45</title>
<polygon fill="none" stroke="black" points="1764,-790.5 1646,-790.5 1646,-749.5 1764,-749.5 1764,-790.5"/>
<text text-anchor="middle" x="1705" y="-778.67" font-family="Times Roman,serif" font-size="8.70">runtime.settype_flush</text>
<text text-anchor="end" x="1756" y="-767.67" font-family="Times Roman,serif" font-size="8.70">42 (0.0%)</text>
<text text-anchor="end" x="1756" y="-756.67" font-family="Times Roman,serif" font-size="8.70">of 2113 (1.1%)</text>
</g>
<!-- N42&#45;&gt;N45 -->
<g id="edge168" class="edge"><title>N42&#45;&gt;N45</title>
<path fill="none" stroke="black" d="M1705,-859.763C1705,-842.408 1705,-819.256 1705,-800.811"/>
<polygon fill="black" stroke="black" points="1708.5,-800.575 1705,-790.575 1701.5,-800.575 1708.5,-800.575"/>
<text text-anchor="middle" x="1723.5" y="-817.4" font-family="Times Roman,serif" font-size="14.00">2113</text>
</g>
<!-- N45&#45;&gt;N21 -->
<g id="edge4" class="edge"><title>N45&#45;&gt;N21</title>
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## xmlp.go
// example of parallel XML stream processing, using wikidata XML dump
package main

import (
	"encoding/xml"
	"flag"
	"fmt"
	"os"
	"runtime/pprof"
)

type Redirect struct {
	Title string `xml:"title,attr" json:"title"`
}

// A page as it occurs on Wikipedia
type Page struct {
	Title          string   `xml:"title" json:"title"`
	CanonicalTitle string   `xml:"ctitle" json:"ctitle"`
	Redir          Redirect `xml:"redirect" json:"redirect"`
	Text           string   `xml:"revision>text" json:"text"`
}

func main() {
	cpuprofile := flag.String("cpuprofile", "", "write cpu profile to file")

	flag.Parse()

	if *cpuprofile != "" {
		f, err := os.Create(*cpuprofile)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
		}
		pprof.StartCPUProfile(f)
		defer pprof.StopCPUProfile()
	}

	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: %s WIKDATA-XML-FILE\n", os.Args[0])
		fmt.Fprintf(os.Stderr, "Find dumps under http://dumps.wikimedia.org/wikidatawiki/\n")
		flag.PrintDefaults()
	}

	if flag.NArg() < 1 {
		flag.Usage()
		os.Exit(1)
	}

	filename := flag.Args()[0]

	handle, err := os.Open(filename)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer handle.Close()

	decoder := xml.NewDecoder(handle)
	var inElement string
	var p Page

	for {
		// Read tokens from the XML document in a stream.
		t, _ := decoder.Token()
		if t == nil {
			break
		}
		// Inspect the type of the token just read.
		switch se := t.(type) {
		case xml.StartElement:
			// If we just read a StartElement token
			inElement = se.Name.Local
			// ...and its name is "page"
			if inElement == "page" {
				// decode a whole chunk of following XML into the
				// variable p which is a Page (se above)
				decoder.DecodeElement(&p, &se)
			}
		default:
		}
	}
}
	// example of parallel XML stream processing, using wikidata XML dump
	package main

	import (
	"encoding/xml"
	"flag"
	"fmt"
	"os"
	"runtime/pprof"
	)

	type Redirect struct {
	Title string `xml:"title,attr" json:"title"`
	}

	// A page as it occurs on Wikipedia
	type Page struct {
	Title string `xml:"title" json:"title"`
	CanonicalTitle string `xml:"ctitle" json:"ctitle"`
	Redir Redirect `xml:"redirect" json:"redirect"`
	Text string `xml:"revision>text" json:"text"`
	}

	func main() {
	cpuprofile := flag.String("cpuprofile", "", "write cpu profile to file")

	flag.Parse()

	if *cpuprofile != "" {
	f, err := os.Create(*cpuprofile)
	if err != nil {
	fmt.Fprintln(os.Stderr, err)
	}
	pprof.StartCPUProfile(f)
	defer pprof.StopCPUProfile()
	}

	flag.Usage = func() {
	fmt.Fprintf(os.Stderr, "Usage: %s WIKDATA-XML-FILE\n", os.Args[0])
	fmt.Fprintf(os.Stderr, "Find dumps under http://dumps.wikimedia.org/wikidatawiki/\n")
	flag.PrintDefaults()
	}

	if flag.NArg() < 1 {
	flag.Usage()
	os.Exit(1)
	}

	filename := flag.Args()[0]

	handle, err := os.Open(filename)
	if err != nil {
	fmt.Println(err)
	return
	}
	defer handle.Close()

	decoder := xml.NewDecoder(handle)
	var inElement string
	var p Page

	for {
	// Read tokens from the XML document in a stream.
	t, _ := decoder.Token()
	if t == nil {
	break
	}
	// Inspect the type of the token just read.
	switch se := t.(type) {
	case xml.StartElement:
	// If we just read a StartElement token
	inElement = se.Name.Local
	// ...and its name is "page"
	if inElement == "page" {
	// decode a whole chunk of following XML into the
	// variable p which is a Page (se above)
	decoder.DecodeElement(&p, &se)
	}
	default:
	}
	}
	}