Skip to content

Instantly share code, notes, and snippets.

View felixge's full-sized avatar

Felix Geisendörfer felixge

4.2k followers · 14 following
View GitHub Profile
@felixge
felixge / main.go
Last active November 26, 2024 08:05
package main
import (
"log"
"os"
"runtime/trace"
"time"
)
func main() {
@felixge
felixge / 0001-runtime-use-sched.bp-for-unwinding-trace-events-with.patch
Created March 10, 2023 10:07
From 08b6b8208c07c3f764da8a8fbbc01d0b1573748a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felix=20Geisend=C3=B6rfer?=
<felix.geisendoerfer@datadoghq.com>
Date: Fri, 10 Mar 2023 11:04:19 +0100
Subject: [PATCH] runtime: use sched.bp for unwinding trace events with frame
pointers
Depends on CL 472195.
Change-Id: Ibe91debf04569d18ccb2eb6497bfebdd1eaeaf74
@felixge
felixge / compile.txt
Created February 4, 2023 10:29
$ go tool compile -S main.go
main.main STEXT size=64 args=0x0 locals=0x8 funcid=0x0 align=0x0
0x0000 00000 (main.go:3) TEXT main.main(SB), ABIInternal, $16-0
0x0000 00000 (main.go:3) MOVD 16(g), R16
0x0004 00004 (main.go:3) PCDATA $0, $-2
0x0004 00004 (main.go:3) CMP R16, RSP
0x0008 00008 (main.go:3) BLS 40
0x000c 00012 (main.go:3) PCDATA $0, $-1
0x000c 00012 (main.go:3) MOVD.W R30, -16(RSP)
0x0010 00016 (main.go:3) MOVD R29, -8(RSP)
@felixge
felixge / 0-note.md
Last active April 11, 2023 04:14

All results are based on my patch against the sweet benchmarks.

  • baseline is HEAD^ with tracing disabled.
  • gentraceback is HEAD^ with tracing enabled (-trace).
  • fpcallers is HEAD with tracing enabled (-trace).
@felixge
felixge / macos_pprof_bias.go
Created January 10, 2023 14:56
package main
import (
"bytes"
"compress/gzip"
"io"
"os"
"testing"
)
@felixge
felixge / _commands.bash
Created November 2, 2022 15:45
$ curl 'http://169.254.169.254/latest/meta-data/instance-type'
c6g.metal
$ go version
go version go1.19.3 linux/arm64
$ go test -run='^$' -cpu=1,2,4,8,16,32,64 -bench . -count=30 -timeout=0 | tee bench.txt
$ benchstat bench.txt | tee benchstat.txt
@felixge
felixge / test.diff
Last active December 28, 2021 20:25
diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go
index 1947edf44a..f474036ccf 100644
--- a/src/runtime/pprof/pprof_test.go
+++ b/src/runtime/pprof/pprof_test.go
@@ -1435,49 +1435,25 @@ func TestLabelSystemstack(t *testing.T) {
// Two conditions to check:
// * labelHog should always be labeled.
// * The label should _only_ appear on labelHog and the Do call above.
- for _, s := range p.Sample {
+ _true, _false := true, false
@felixge
felixge / json0.json
Last active November 2, 2021 18:24
{"version":0,"package":"main","goos":"darwin","goarch":"amd64","gc_version":"go1.17.2","file":"/Users/felix.geisendoerfer/go/src/github.com/felixge/dump/inline-test/main.go"}
{"range":{"start":{"line":5,"character":6},"end":{"line":5,"character":6}},"severity":3,"code":"canInlineFunction","source":"go compiler","message":"cost: 59"}
{"range":{"start":{"line":9,"character":6},"end":{"line":9,"character":6}},"severity":3,"code":"cannotInlineFunction","source":"go compiler","message":"function too complex: cost 88 exceeds budget 80"}
{"range":{"start":{"line":11,"character":15},"end":{"line":11,"character":15}},"severity":3,"code":"escape","source":"go compiler","message":"\"Hello World\" escapes to heap","relatedInformation":[{"location":{"uri":"file:///Users/felix.geisendoerfer/go/src/github.com/felixge/dump/inline-test/main.go","range":{"start":{"line":11,"character":15},"end":{"line":11,"character":15}}},"message":"escflow: flow: ~arg0 = \u0026{storage for \"Hello World\"}:"},{"location":{"uri":"file:///U
@felixge
felixge / example.json
Created August 13, 2020 08:30
{
"flameExplain": "Go to flame-explain.com and paste this JSON in the Input tab.",
"input": {
"plan": "[\n {\n \"Plan\": {\n \"Node Type\": \"Function Scan\",\n \"Parallel Aware\": false,\n \"Function Name\": \"generate_series\",\n \"Schema\": \"pg_catalog\",\n \"Alias\": \"generate_series\",\n \"Startup Cost\": 0.00,\n \"Total Cost\": 10.00,\n \"Plan Rows\": 1000,\n \"Plan Width\": 4,\n \"Actual Startup Time\": 194.503,\n \"Actual Total Time\": 331.185,\n \"Actual Rows\": 1500000,\n \"Actual Loops\": 1,\n \"Output\": [\"generate_series\"],\n \"Function Call\": \"generate_series(1, 1500000)\",\n \"Shared Hit Blocks\": 0,\n \"Shared Read Blocks\": 0,\n \"Shared Dirtied Blocks\": 0,\n \"Shared Written Blocks\": 0,\n \"Local Hit Blocks\": 0,\n \"Local Read Blocks\": 0,\n \"Local Dirtied Blocks\": 0,\n \"Local Written Blocks\": 0,\n \"Temp Read Blocks\": 0,\n \"Temp Written Bloc
@felixge
felixge / example.json
Created August 13, 2020 08:30
{
"flameExplain": "Go to flame-explain.com and paste this JSON in the Input tab.",
"input": {
"plan": "[\n {\n \"Plan\": {\n \"Node Type\": \"Function Scan\",\n \"Parallel Aware\": false,\n \"Function Name\": \"generate_series\",\n \"Schema\": \"pg_catalog\",\n \"Alias\": \"generate_series\",\n \"Startup Cost\": 0.00,\n \"Total Cost\": 10.00,\n \"Plan Rows\": 1000,\n \"Plan Width\": 4,\n \"Actual Startup Time\": 194.503,\n \"Actual Total Time\": 331.185,\n \"Actual Rows\": 1500000,\n \"Actual Loops\": 1,\n \"Output\": [\"generate_series\"],\n \"Function Call\": \"generate_series(1, 1500000)\",\n \"Shared Hit Blocks\": 0,\n \"Shared Read Blocks\": 0,\n \"Shared Dirtied Blocks\": 0,\n \"Shared Written Blocks\": 0,\n \"Local Hit Blocks\": 0,\n \"Local Read Blocks\": 0,\n \"Local Dirtied Blocks\": 0,\n \"Local Written Blocks\": 0,\n \"Temp Read Blocks\": 0,\n \"Temp Written Bloc