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perf: add command for measuring revlog chunk operations...
perf: add command for measuring revlog chunk operations Upcoming commits will teach revlogs to leverage the new compression engine API so that new compression formats can more easily be leveraged in revlogs. We want to be sure this refactoring doesn't regress performance. So this commit introduces "perfrevchunks" to explicitly test performance of reading, decompressing, and recompressing revlog chunks. Here is output when run on the mozilla-unified repo: $ hg perfrevlogchunks -c ! read ! wall 0.346603 comb 0.350000 user 0.340000 sys 0.010000 (best of 28) ! read w/ reused fd ! wall 0.337707 comb 0.340000 user 0.320000 sys 0.020000 (best of 30) ! read batch ! wall 0.013206 comb 0.020000 user 0.000000 sys 0.020000 (best of 221) ! read batch w/ reused fd ! wall 0.013259 comb 0.030000 user 0.010000 sys 0.020000 (best of 222) ! chunk ! wall 1.909939 comb 1.910000 user 1.900000 sys 0.010000 (best of 6) ! chunk batch ! wall 1.750677 comb 1.760000 user 1.740000 sys 0.020000 (best of 6) ! compress ! wall 5.668004 comb 5.670000 user 5.670000 sys 0.000000 (best of 3) $ hg perfrevlogchunks -m ! read ! wall 0.365834 comb 0.370000 user 0.350000 sys 0.020000 (best of 26) ! read w/ reused fd ! wall 0.350160 comb 0.350000 user 0.320000 sys 0.030000 (best of 28) ! read batch ! wall 0.024777 comb 0.020000 user 0.000000 sys 0.020000 (best of 119) ! read batch w/ reused fd ! wall 0.024895 comb 0.030000 user 0.000000 sys 0.030000 (best of 118) ! chunk ! wall 2.514061 comb 2.520000 user 2.480000 sys 0.040000 (best of 4) ! chunk batch ! wall 2.380788 comb 2.380000 user 2.360000 sys 0.020000 (best of 5) ! compress ! wall 9.815297 comb 9.820000 user 9.820000 sys 0.000000 (best of 3) We already see some interesting data, such as how much slower non-batched chunk reading is and that zlib compression appears to be >2x slower than decompression. I didn't have the data when I wrote this commit message, but I ran this on Mozilla's NFS-based Mercurial server and the time for reading with a reused file descriptor was faster. So I think it is worth testing both with and without file descriptor reuse so we can make informed decisions about recycling file descriptors.
Yuya Nishihara - - Load All Authors

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test-propertycache.py
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/ tests / test-propertycache.py
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"""test behavior of propertycache and unfiltered propertycache
The repoview overlay is quite complex. We test the behavior of
property cache of both localrepo and repoview to prevent
regression."""
from __future__ import absolute_import, print_function
import os
import subprocess
from mercurial import (
hg,
localrepo,
ui as uimod,
util,
)
# create some special property cache that trace they call
calllog = []
@util.propertycache
def testcachedfoobar(repo):
name = repo.filtername
if name is None:
name = ''
val = len(name)
calllog.append(val)
return val
unficalllog = []
@localrepo.unfilteredpropertycache
def testcachedunfifoobar(repo):
name = repo.filtername
if name is None:
name = ''
val = 100 + len(name)
unficalllog.append(val)
return val
#plug them on repo
localrepo.localrepository.testcachedfoobar = testcachedfoobar
localrepo.localrepository.testcachedunfifoobar = testcachedunfifoobar
# Create an empty repo and instantiate it. It is important to run
# these tests on the real object to detect regression.
repopath = os.path.join(os.environ['TESTTMP'], 'repo')
assert subprocess.call(['hg', 'init', repopath]) == 0
ui = uimod.ui()
repo = hg.repository(ui, path=repopath).unfiltered()
print('')
print('=== property cache ===')
print('')
print('calllog:', calllog)
print('cached value (unfiltered):',
vars(repo).get('testcachedfoobar', 'NOCACHE'))
print('')
print('= first access on unfiltered, should do a call')
print('access:', repo.testcachedfoobar)
print('calllog:', calllog)
print('cached value (unfiltered):',
vars(repo).get('testcachedfoobar', 'NOCACHE'))
print('')
print('= second access on unfiltered, should not do call')
print('access', repo.testcachedfoobar)
print('calllog:', calllog)
print('cached value (unfiltered):',
vars(repo).get('testcachedfoobar', 'NOCACHE'))
print('')
print('= first access on "visible" view, should do a call')
visibleview = repo.filtered('visible')
print('cached value ("visible" view):',
vars(visibleview).get('testcachedfoobar', 'NOCACHE'))
print('access:', visibleview.testcachedfoobar)
print('calllog:', calllog)
print('cached value (unfiltered):',
vars(repo).get('testcachedfoobar', 'NOCACHE'))
print('cached value ("visible" view):',
vars(visibleview).get('testcachedfoobar', 'NOCACHE'))
print('')
print('= second access on "visible view", should not do call')
print('access:', visibleview.testcachedfoobar)
print('calllog:', calllog)
print('cached value (unfiltered):',
vars(repo).get('testcachedfoobar', 'NOCACHE'))
print('cached value ("visible" view):',
vars(visibleview).get('testcachedfoobar', 'NOCACHE'))
print('')
print('= no effect on other view')
immutableview = repo.filtered('immutable')
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedfoobar', 'NOCACHE'))
print('access:', immutableview.testcachedfoobar)
print('calllog:', calllog)
print('cached value (unfiltered):',
vars(repo).get('testcachedfoobar', 'NOCACHE'))
print('cached value ("visible" view):',
vars(visibleview).get('testcachedfoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedfoobar', 'NOCACHE'))
# unfiltered property cache test
print('')
print('')
print('=== unfiltered property cache ===')
print('')
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("visible" view): ',
vars(visibleview).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedunfifoobar', 'NOCACHE'))
print('')
print('= first access on unfiltered, should do a call')
print('access (unfiltered):', repo.testcachedunfifoobar)
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('')
print('= second access on unfiltered, should not do call')
print('access (unfiltered):', repo.testcachedunfifoobar)
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('')
print('= access on view should use the unfiltered cache')
print('access (unfiltered): ', repo.testcachedunfifoobar)
print('access ("visible" view): ', visibleview.testcachedunfifoobar)
print('access ("immutable" view):', immutableview.testcachedunfifoobar)
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("visible" view): ',
vars(visibleview).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedunfifoobar', 'NOCACHE'))
print('')
print('= even if we clear the unfiltered cache')
del repo.__dict__['testcachedunfifoobar']
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("visible" view): ',
vars(visibleview).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedunfifoobar', 'NOCACHE'))
print('unficalllog:', unficalllog)
print('access ("visible" view): ', visibleview.testcachedunfifoobar)
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("visible" view): ',
vars(visibleview).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedunfifoobar', 'NOCACHE'))
print('access ("immutable" view):', immutableview.testcachedunfifoobar)
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("visible" view): ',
vars(visibleview).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedunfifoobar', 'NOCACHE'))
print('access (unfiltered): ', repo.testcachedunfifoobar)
print('unficalllog:', unficalllog)
print('cached value (unfiltered): ',
vars(repo).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("visible" view): ',
vars(visibleview).get('testcachedunfifoobar', 'NOCACHE'))
print('cached value ("immutable" view):',
vars(immutableview).get('testcachedunfifoobar', 'NOCACHE'))