ksoda

Memo: メソドロジと可観測性ツール

詳解 システム・パフォーマンスから。よくわからない箇所を書き留めるための文書。

メソドロジと分析

仕事を省略できるので性能チューニングは仕事をする場所付近で行うと効果が高い。 チューニング2.3.4やワークロードの特性の把握2.5.10参照。

方向性を定めるため目標を定めると、行動を選択するとき役立つ。定まればあとは要因を探すだけだ。

ksoda

Alloy part 2

前回の続き。Part 3

アトムと関係

アトムとは不可分、不変、非解釈（性質が組み込まれていない）を満たす。これだけではモデル化する能力が足りない。 そこで時空間を表せる関係を導入する。これはアトムからなるタプルの集合だ。

論理系

ksoda

var _require = function _require(cond) {
  if (!cond) {
    factor(-Infinity);
  }
}

// Class attendance model.
var attendance = function(i_pl, i_stats, busy) {
  var attendance = function (interest, busy) {
    if (interest) {

ksoda

(def alt-from-char {\U 1 \D -1})

(defn ending-valley? [step alt]
  (and (= alt -1) (= step \U)))

(defn countingValleys [n s]
  (:cnt
   (reduce
    (fn [acc step]
      (let [{:keys [cnt alt]} acc]

ksoda

#[allow(dead_code)]
fn read<T: std::str::FromStr>() -> Option<T> {
    let mut b = String::new();
    std::io::stdin().read_line(&mut b).ok();
    b.trim().parse().ok()
}

/// # Examples
/// ```
/// let mtx = (0..2).map(|_| read_v().unwrap()).collect();

ksoda

"No.","Time","Source","Destination","Protocol","Length","Info"
"6","17.004176504","192.168.56.102","192.168.56.1","TCP","66","49931  >  4444 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 WS=256 SACK_PERM=1"
"7","17.004243596","192.168.56.1","192.168.56.102","TCP","66","4444  >  49931 [SYN, ACK] Seq=0 Ack=1 Win=64240 Len=0 MSS=1460 SACK_PERM=1 WS=128"
"8","17.004560848","192.168.56.102","192.168.56.1","TCP","54","49931  >  4444 [ACK] Seq=1 Ack=1 Win=2102272 Len=0"
"9","17.013046010","192.168.56.102","192.168.56.1","HTTP","202","GET /grid/api/hub HTTP/1.1 "
"10","17.013094764","192.168.56.1","192.168.56.102","TCP","54","4444  >  49931 [ACK] Seq=1 Ack=149 Win=64128 Len=0"
"13","17.056025","192.168.56.102","192.168.56.1","TCP","66","[TCP Retransmission] 49931  >  4444 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 WS=256 SACK_PERM=1"
"14","17.056329","192.168.56.1","192.168.56.102","TCP","66","[TCP Retransmission] 4444  >  49931 [SYN, ACK] Seq=0 Ack=1 Win=64240 Len=0 MSS=1460 SACK_PERM=1 WS=128"
"15","17.056409","192.168.56.102","1

ksoda

MIT License

Copyright (c) 2019 Ken SONODA

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

ksoda

let
  pkgs = import <nixpkgs> {};
  stdenv = pkgs.stdenv;
in with pkgs; {
  myProject = stdenv.mkDerivation {
    name = "myProject";
    version = "1";
    src = if pkgs.lib.inNixShell then null else nix;

    buildInputs = with rPackages; [

ksoda

//javascript:
(() => {
  const mkDebounce = fn => {
    let timeoutId;
    let resolves = [];
    return function(...args) {
      return new Promise(resolve => {
        clearTimeout(timeoutId);
        timeoutId = setTimeout(() => {
          timeoutId = null;

ksoda

//usr/bin/env go run "$0" "$@"; exit "$?"
package main

import (
	"fmt"
	"os"

	"github.com/codeskyblue/go-sh"
)