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#!/usr/bin/env python
"""%prog [options] shellpath dirpath
Pulls performance data on parsing via the js shell.
Displays the average number of milliseconds it took to parse each file.
For comparison, something apparently approximating a t-test is performed:
"Faster" means that:
t_baseline_goodrun = (t_baseline_avg - t_baseline_stddev)
t_current_badrun = (t_current_avg + t_current_stddev)
t_current_badrun < t_baseline_goodrun
Effectively, a bad run from the current data is better than a good run from the
baseline data, we're probably faster. A similar computation is used for
determining the "slower" designation.
Arguments:
shellpath executable JavaScript shell
dirpath directory filled with parsilicious js files
"""
from __future__ import print_function
import math
import optparse
import os
import subprocess as subp
import sys
from string import Template
try:
import compare_bench
except ImportError:
compare_bench = None
_DIR = os.path.dirname(__file__)
JS_CODE_TEMPLATE = Template("""
if (typeof snarf !== 'undefined') read = snarf
var contents = read("$filepath");
for (var i = 0; i < $warmup_run_count; i++)
parse(contents);
var results = [];
for (var i = 0; i < $real_run_count; i++) {
var start = new Date();
parse(contents);
var end = new Date();
results.push(end - start);
}
print(results);
""")
def gen_filepaths(dirpath, target_ext='.js'):
for filename in os.listdir(dirpath):
if filename.endswith(target_ext):
yield os.path.join(dirpath, filename)
def avg(seq):
return sum(seq) / len(seq)
def stddev(seq, mean):
diffs = ((float(item) - mean) ** 2 for item in seq)
return math.sqrt(sum(diffs) / len(seq))
def bench(shellpath, filepath, warmup_runs, counted_runs, stfu=False):
"""Return a list of milliseconds for the counted runs."""
assert '"' not in filepath
code = JS_CODE_TEMPLATE.substitute(filepath=filepath,
warmup_run_count=warmup_runs,
real_run_count=counted_runs)
proc = subp.Popen([shellpath, '-e', code], stdout=subp.PIPE)
stdout, _ = proc.communicate()
milliseconds = [float(val) for val in stdout.split(',')]
mean = avg(milliseconds)
sigma = stddev(milliseconds, mean)
if not stfu:
print('Runs:', [int(ms) for ms in milliseconds])
print('Mean:', mean)
print('Stddev: {:.2f} ({:.2f}% of mean)'.format(
sigma, sigma / mean * 100))
return mean, sigma
def parsemark(filepaths, fbench, stfu=False):
""":param fbench: fbench(filename) -> float"""
bench_map = {} # {filename: (avg, stddev)}
for filepath in filepaths:
filename = os.path.split(filepath)[-1]
if not stfu:
print('Parsemarking {}...'.format(filename))
bench_map[filename] = fbench(filepath)
print('{')
for i, (filename, (avg, stddev)) in enumerate(bench_map.iteritems()):
assert '"' not in filename
fmt = ' {:30s}: {{"average_ms": {:6.2f}, "stddev_ms": {:6.2f}}}'
if i != len(bench_map) - 1:
fmt += ','
filename_str = '"{}"'.format(filename)
print(fmt.format(filename_str, avg, stddev))
print('}')
return dict((filename, dict(average_ms=avg, stddev_ms=stddev))
for filename, (avg, stddev) in bench_map.iteritems())
def main():
parser = optparse.OptionParser(usage=__doc__.strip())
parser.add_option('-w', '--warmup-runs', metavar='COUNT', type=int,
default=5,
help='used to minimize test instability [%default]')
parser.add_option('-c', '--counted-runs', metavar='COUNT', type=int,
default=50,
help='timed data runs that count towards the average'
' [%default]')
parser.add_option('-s', '--shell', metavar='PATH',
help='explicit shell location; when omitted, will look'
' in likely places')
parser.add_option('-b', '--baseline', metavar='JSON_PATH',
dest='baseline_path',
help='json file with baseline values to '
'compare against')
parser.add_option('-q', '--quiet', dest='stfu', action='store_true',
default=False,
help='only print JSON to stdout [%default]')
options, args = parser.parse_args()
try:
shellpath = args.pop(0)
except IndexError:
parser.print_help()
print()
print('error: shellpath required', file=sys.stderr)
return -1
try:
dirpath = args.pop(0)
except IndexError:
parser.print_help()
print()
print('error: dirpath required', file=sys.stderr)
return -1
if not shellpath or not os.path.exists(shellpath):
print('error: could not find shell:', shellpath, file=sys.stderr)
return -1
if options.baseline_path:
if not os.path.isfile(options.baseline_path):
print('error: baseline file does not exist', file=sys.stderr)
return -1
if not compare_bench:
print('error: JSON support is missing, cannot compare benchmarks',
file=sys.stderr)
return -1
benchfile = lambda filepath: bench(shellpath, filepath,
options.warmup_runs,
options.counted_runs,
stfu=options.stfu)
bench_map = parsemark(gen_filepaths(dirpath), benchfile, options.stfu)
if options.baseline_path:
compare_bench.compare_immediate(bench_map, options.baseline_path)
return 0
if __name__ == '__main__':
sys.exit(main())
|
