benhoyt

# $ python3 count_features.py writings/go-python-features.md 
# go1.25  0 23
# go1.24  1 29
# go1.23 15 27
# go1.22  6 41
# go1.21  8 50
# go1.20  4 33
# go1.19  0 14
# go1.18 15 31
# go1.17  3 15

benhoyt

| Go version | binary size (MB) | countwords (s) | sumloop (s) |
| ---------- | ---------------- | -------------- | ----------- |
| 1.0        |             3.27 |           8.20 |        9.47 |
| 1.1        |             3.95 |           7.57 |        9.54 |
| 1.2        |             5.50 |          25.51 |        9.36 |
| 1.3        |             4.27 |           2.85 |        1.99 |
| 1.4        |             4.32 |           3.03 |        2.13 |
| 1.5        |             4.73 |           2.16 |        1.16 |
| 1.6        |             4.70 |           2.15 |        1.18 |
| 1.7        |             3.94 |           1.86 |        0.63 |

benhoyt

import csv
import os
import subprocess
import time


print('| Go version | binary size (MB) | countwords (s) | sumloop (s) |')
print('| ---------- | ---------------- | -------------- | ----------- |')

benhoyt

package model

import (
	"database/sql"
	"errors"
	"fmt"
	"reflect"
	"sync"
)

benhoyt

import collections, random, sys, textwrap

# Build possibles table indexed by pair of prefix words (w1, w2)
w1 = w2 = ''
possibles = collections.defaultdict(list)
for line in sys.stdin:
    for word in line.split():
        possibles[w1, w2].append(word)
        w1, w2 = w2, word

benhoyt

package main

import (
	"fmt"
	"net/http"
	"strconv"
)

func main() {
	http.HandleFunc("/multiply", func(w http.ResponseWriter, r *http.Request) {

benhoyt

BEGIN {
	FS = ","
}

{
	nf = csvify(fields)

	for (i=1; i<=nf; i++) {
		printf "|%s|\n", fields[i]
	}

benhoyt

package main

import (
	"fmt"
	"os"
	"path/filepath"
)

func main() {
	if len(os.Args) != 2 {

benhoyt

# NOTES
"before" is Go version go1.19-dd97871282, before the switch jump tables commits
"after" is Go version go1.19-78bea702cd, after the switch jump tables commits


# GOAWK'S GO MICROBENCHMARKS
$ benchstat -sort=delta -geomean benchmarks_before.txt benchmarks_after.txt 
name                    old time/op  new time/op  delta
IncrDecr-8               141ns ± 1%   160ns ± 2%  +13.59%  (p=0.008 n=5+5)
IfStatement-8            147ns ± 1%   157ns ± 2%   +6.59%  (p=0.008 n=5+5)

benhoyt

     static void* prog[] = {
-        // loop:
         &&i_pushvar0,                       // pushvar i
         &&i_pushnum, (void*)100000000,      // pushnum 100000000
         &&i_jge, (void*)5,                  // jge end
+        // loop:
         &&i_pushvar0,                       // push i
         &&i_addvar1,                        // addvar s
         &&i_incvar0,                        // incvar i
-        &&i_jmp, (void*)((long long)-10),   // jmp loop