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import os
import subprocess as sp
def percentile(sequence, percent):
if not sequence:
return None
values = sorted(sequence)
if percent == 0:
return values[0]
pos = int(len(values) * percent) - 1
return values[pos]
def secs(value):
units = ['s ', 'ms', 'us', 'ns']
if value is None:
return ' 0.000ns'
elif value == 0:
return ' 0.000ns'
else:
for unit in units:
if value > 1:
return '%7.3f' % value + unit
else:
value *= 1000
def run(*args):
"""Run command, print output, and return output."""
print('utils$', *args)
result = sp.check_output(args)
print(result)
return result.strip()
def mount_ramdisk(size, path):
"""Mount RAM disk at `path` with `size` in bytes."""
sectors = size / 512
os.makedirs(path)
dev_path = run('hdid', '-nomount', 'ram://%d' % sectors)
run('newfs_hfs', '-v', 'RAMdisk', dev_path)
run('mount', '-o', 'noatime', '-t', 'hfs', dev_path, path)
return dev_path
def unmount_ramdisk(dev_path, path):
"""Unmount RAM disk with `dev_path` and `path`."""
run('umount', path)
run('diskutil', 'eject', dev_path)
run('rm', '-r', path)
def display(name, timings):
cols = ('Action', 'Count', 'Miss', 'Median', 'P90', 'P99', 'Max', 'Total')
template = ' '.join(['%9s'] * len(cols))
print()
print(' '.join(['=' * 9] * len(cols)))
print('Timings for %s' % name)
print('-'.join(['-' * 9] * len(cols)))
print(template % cols)
print(' '.join(['=' * 9] * len(cols)))
len_total = sum_total = 0
for action in ['get', 'set', 'delete']:
values = timings[action]
len_total += len(values)
sum_total += sum(values)
print(
template
% (
action,
len(values),
len(timings.get(action + '-miss', [])),
secs(percentile(values, 0.5)),
secs(percentile(values, 0.9)),
secs(percentile(values, 0.99)),
secs(percentile(values, 1.0)),
secs(sum(values)),
)
)
totals = ('Total', len_total, '', '', '', '', '', secs(sum_total))
print(template % totals)
print(' '.join(['=' * 9] * len(cols)))
print()
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