Thomas Pelletier pelletier

While benchmarking https://github.com/pelletier/go-toml/tree/v2, I decided to play with CPU frequency scaling, to eliminate some noise in the benchmarks.

Running on the following:

goos: linux
goarch: amd64
cpu: AMD Ryzen 9 5950X 16-Core Processor
kernel: 5.12.8-300.fc34.x86_64

	"""Python script that automates the benchmarking of Go utf8.Valid function over
	small inputs.

	This script will clone the Go repository, build the Go toolchain, and run the
	utf8.Valid benchmarks over small inputs, both on the CL and its parent, and plot
	the time per operation.

	Requirements:

	- Python 3

	#include <immintrin.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/mman.h>

	const char mask_bytes[] = {
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

	;; Display the assembly generated by the Go compiler of the code at current line in an emacs buffer.
	;;
	;; Navigate to a line of go code, then M-x my/go-show-asm.
	(defun my/go-show-asm ()
	(interactive)
	(let* ((p (buffer-file-name))
	(out-b "go-show-asm")
	(needle (concat p ":" (number-to-string (line-number-at-pos)))))
	(if (string-suffix-p ".go" p)
	(progn

	// Go AVO code that generates a right shift cross lanes with zeroes fill when offset is known and less than 16 bytes.

	Comment("Shift right that works if remaining bytes >= 16")

	VPMOVQU(Mem{Base: d}, currentBlockY)

	zeroes := YMM()
	VPXOR(zeroes, zeroes, zeroes)

	src1 := YMM()

	# Script to generate performance graph for utf8.Valid.
	# Takes output of go test -bench as stdin.
	#
	# make && go test ./utf8 -run=None -bench=BenchmarkValid\|tee out.txt
	# python plot.py < out.txt
	# open data.png


	import fileinput
	import re

	// Package document provides tools for manipulating the structure of TOML
	// documents.
	//
	// While github.com/pelletier/go-toml provides efficient functions to transform
	// TOML documents to and from usual Go types, this package allows you to create
	// and modify the structure of a TOML document.
	//
	// Comments
	//
	// Most structural elements of a Document can have comments attached to them.

	gh issue list --json number,title,body -t "{{range .}}
	---

	## {{.number}} - {{.title}}

	{{.body}}

	{{end}}"\|sed 's/\r//g' > issues.md

	package main

	import (
	"reflect"
	"unsafe"
	)

	// Safe version to do this.
	func ReadOnlyChanFromSlice(s []string) <-chan string {
	c := make(chan string, len(s))