Go switch jump tables - before and after performance using GoAWK

gistfile1.txt

# 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)
CondExpr-8               147ns ± 1%   157ns ± 1%   +6.55%  (p=0.008 n=5+5)
BuiltinSplitSpace-8     34.7µs ± 1%  34.3µs ± 1%     ~     (p=0.151 n=5+5)
BuiltinSplitRegex-8     89.0µs ± 3%  91.9µs ± 6%     ~     (p=0.222 n=5+5)
BuiltinSub-8            14.0µs ± 1%  13.9µs ± 4%     ~     (p=0.841 n=5+5)
BuiltinSubAmpersand-8   14.0µs ± 3%  13.7µs ± 2%     ~     (p=0.222 n=5+5)
BuiltinGsub-8           16.8µs ± 3%  16.9µs ± 7%     ~     (p=1.000 n=5+5)
BuiltinGsubAmpersand-8  16.5µs ± 2%  16.4µs ± 4%     ~     (p=0.579 n=5+5)
BuiltinSprintf-8        7.77µs ± 2%  7.74µs ± 4%     ~     (p=0.151 n=5+5)
NativeFunc-8            10.1µs ± 2%  10.0µs ± 1%     ~     (p=0.056 n=5+5)
ForInLoop-8             1.62µs ± 3%  1.64µs ± 5%     ~     (p=0.421 n=5+5)
SimplePattern-8          129ns ± 2%   127ns ± 2%     ~     (p=0.286 n=5+5)
ConcatSmall-8            348ns ± 6%   355ns ± 3%     ~     (p=0.421 n=5+5)
ArrayOperations-8        566ns ± 1%   572ns ± 0%     ~     (p=0.087 n=5+5)
AugAssign-8              932ns ± 1%   945ns ± 2%     ~     (p=0.095 n=5+5)
Print-8                 2.21µs ± 2%  2.21µs ± 2%     ~     (p=1.000 n=5+5)
RepeatExecProgram-8     13.8µs ± 6%  14.0µs ± 6%     ~     (p=0.841 n=5+5)
RepeatNew-8             87.6ns ± 2%  87.7ns ± 1%     ~     (p=0.690 n=5+5)
RepeatIOExecProgram-8   23.3µs ± 0%  23.3µs ± 1%     ~     (p=0.841 n=5+5)
RepeatIONew-8           1.12µs ± 2%  1.11µs ± 3%     ~     (p=1.000 n=5+5)
Printf-8                4.41µs ± 1%  4.33µs ± 1%   -1.74%  (p=0.016 n=5+5)
LocalVars-8              270ns ± 1%   264ns ± 2%   -2.24%  (p=0.032 n=5+5)
RegexMatch-8            1.06µs ± 1%  1.03µs ± 1%   -2.37%  (p=0.008 n=5+5)
GlobalVars-8             258ns ± 1%   251ns ± 0%   -2.82%  (p=0.008 n=5+5)
BuiltinMatch-8          2.60µs ± 0%  2.51µs ± 1%   -3.44%  (p=0.008 n=5+5)
ForLoop-8               2.35µs ± 1%  2.26µs ± 2%   -3.69%  (p=0.008 n=5+5)
GetField-8               331ns ± 4%   318ns ± 1%   -3.96%  (p=0.008 n=5+5)
RecursiveFunc-8         14.1µs ± 2%  13.5µs ± 1%   -4.07%  (p=0.008 n=5+5)
BuiltinIndex-8           993ns ± 1%   952ns ± 1%   -4.16%  (p=0.008 n=5+5)
FuncCall-8              2.59µs ± 1%  2.47µs ± 2%   -4.46%  (p=0.008 n=5+5)
SetField-8               780ns ± 1%   741ns ± 2%   -4.93%  (p=0.008 n=5+5)
Comparisons-8            324ns ± 2%   307ns ± 1%   -5.03%  (p=0.008 n=5+5)
Assign-8                 253ns ± 1%   239ns ± 2%   -5.48%  (p=0.008 n=5+5)
BuiltinSubstr-8          736ns ± 1%   693ns ± 1%   -5.93%  (p=0.008 n=5+5)
BinaryOperators-8        432ns ± 1%   403ns ± 1%   -6.61%  (p=0.008 n=5+5)
SimpleBuiltins-8         731ns ± 2%   682ns ± 2%   -6.67%  (p=0.008 n=5+5)
ConcatLarge-8           1.61ms ± 3%  1.49ms ± 2%   -7.47%  (p=0.008 n=5+5)
BuiltinLength-8          430ns ± 1%   391ns ± 1%   -9.14%  (p=0.008 n=5+5)
ConcatTwo-8              101ns ± 2%    91ns ± 1%   -9.94%  (p=0.008 n=5+5)
[Geo mean]              1.72µs       1.69µs        -1.70%


# COUNTWORDS - SUMMARY: 3.4% FASTER
0 ~/h/goawk$ cat countwords.awk 
{
    for (i=1; i<=NF; i++)
        counts[tolower($i)]++
}

END {
    for (k in counts)
        print k, counts[k]
}
0 ~/h/goawk$ time ./goawk_before -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.781s
user	0m1.836s
sys	0m0.016s
0 ~/h/goawk$ time ./goawk_before -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.676s
user	0m1.778s
sys	0m0.024s
0 ~/h/goawk$ time ./goawk_before -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.680s
user	0m1.780s
sys	0m0.036s
0 ~/h/goawk$ time ./goawk_before -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.654s
user	0m1.774s
sys	0m0.017s
0 ~/h/goawk$ time ./goawk_before -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.677s
user	0m1.771s
sys	0m0.049s
0 ~/h/goawk$ 
0 ~/h/goawk$ 
0 ~/h/goawk$ 
0 ~/h/goawk$ time ./goawk_after -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.607s
user	0m1.709s
sys	0m0.036s
0 ~/h/goawk$ time ./goawk_after -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.610s
user	0m1.719s
sys	0m0.036s
0 ~/h/goawk$ time ./goawk_after -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.631s
user	0m1.728s
sys	0m0.029s
0 ~/h/goawk$ time ./goawk_after -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.597s
user	0m1.703s
sys	0m0.024s
0 ~/h/goawk$ time ./goawk_after -f countwords.awk ../countwords/kjvbible_x10.txt >/dev/null

real	0m1.607s
user	0m1.711s
sys	0m0.021s

0 ~/h/goawk$ python3
Python 3.9.7 (default, Sep 10 2021, 14:59:43) 
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> (1.654-1.597)/1.654
0.0344619105199516


# SUMFIELD1 - SUMMARY: 4.3% FASTER
0 ~/h/goawk$ time ./goawk_before '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.899s
user	0m0.939s
sys	0m0.032s
0 ~/h/goawk$ time ./goawk_before '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.933s
user	0m0.993s
sys	0m0.012s
0 ~/h/goawk$ time ./goawk_before '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.983s
user	0m1.005s
sys	0m0.044s
0 ~/h/goawk$ time ./goawk_before '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.895s
user	0m0.924s
sys	0m0.048s
0 ~/h/goawk$ time ./goawk_before '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.878s
user	0m0.933s
sys	0m0.020s
0 ~/h/goawk$ 
0 ~/h/goawk$ 
0 ~/h/goawk$ 
0 ~/h/goawk$ time ./goawk_after '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.968s
user	0m1.039s
sys	0m0.000s
0 ~/h/goawk$ time ./goawk_after '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.858s
user	0m0.864s
sys	0m0.060s
0 ~/h/goawk$ time ./goawk_after '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.879s
user	0m0.939s
sys	0m0.012s
0 ~/h/goawk$ 
0 ~/h/goawk$ time ./goawk_after '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.840s
user	0m0.863s
sys	0m0.049s
0 ~/h/goawk$ time ./goawk_after '{ s += $1 } END { print s }' ../countwords/kjvbible_x10.txt ../countwords/kjvbible_x10.txt 
11023640

real	0m0.953s
user	0m1.006s
sys	0m0.017s
0 ~/h/goawk$ python3
Python 3.9.7 (default, Sep 10 2021, 14:59:43) 
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> (.878-.840)/.878
0.04328018223234628


# SUMLOOP - SUMMARY: 4.8% SLOWER
0 ~/h/goawk$ cat sumloop.awk 
BEGIN {
    for (i=0; i<10000000; i++)
        sum += i+i+i+i+i
}
0 ~/h/goawk$ time ./goawk_before -f sumloop.awk 

real	0m0.840s
user	0m0.839s
sys	0m0.004s
0 ~/h/goawk$ time ./goawk_before -f sumloop.awk 

real	0m0.799s
user	0m0.801s
sys	0m0.000s
0 ~/h/goawk$ time ./goawk_before -f sumloop.awk 

real	0m0.843s
user	0m0.842s
sys	0m0.004s
0 ~/h/goawk$ time ./goawk_before -f sumloop.awk 

real	0m0.833s
user	0m0.831s
sys	0m0.004s
0 ~/h/goawk$ time ./goawk_before -f sumloop.awk 

real	0m0.804s
user	0m0.802s
sys	0m0.004s
0 ~/h/goawk$ 
0 ~/h/goawk$ 
0 ~/h/goawk$ time ./goawk_after -f sumloop.awk 

real	0m0.947s
user	0m0.941s
sys	0m0.008s
0 ~/h/goawk$ time ./goawk_after -f sumloop.awk 

real	0m0.943s
user	0m0.942s
sys	0m0.004s
0 ~/h/goawk$ time ./goawk_after -f sumloop.awk 

real	0m0.938s
user	0m0.935s
sys	0m0.004s
0 ~/h/goawk$ time ./goawk_after -f sumloop.awk 

real	0m0.963s
user	0m0.962s
sys	0m0.004s
0 ~/h/goawk$ time ./goawk_before -f sumloop.awk 

real	0m0.837s
user	0m0.836s
sys	0m0.004s

$ python3
Python 3.9.7 (default, Sep 10 2021, 14:59:43) 
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> (0.799-0.837)/0.799
-0.04755944931163945