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#!/usr/bin/env elvish
# Parse an output of "go test -bench .", annotating benchmark results for
# persistent operations with the slowdown ratio compared to their native
# counterparts.
use re
fn extract {|line|
# Extract the name and ns/op of a benchmark entry.
var fields = [(re:split '\s+' $line)]
if (not (eq $fields[-1] ns/op)) {
fail 'Last column of '(repr $line)' not ns/op'
}
put $fields[0] $fields[-2]
}
var native = [&]
each {|line|
if (re:match Native $line) {
# Remember the result so that it can be used later.
var name data = (extract $line)
set native[$name] = $data
} elif (re:match Persistent $line) {
# Calculate slowdown and append to the end of the line.
var name data = (extract $line)
var native-name = (re:replace Persistent Native $name)
if (not (has-key $native $native-name)) {
fail 'Native counterpart for '$name' not found'
}
set line = $line' '(printf '%.2f' (/ $data $native[$native-name]))'x'
}
echo $line
}
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