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revlog: read/cache chunks in fixed windows of 64 KB...
revlog: read/cache chunks in fixed windows of 64 KB When reading a revlog chunk, instead of reading up to 64 KB ahead of the request offset and caching that, this change caches a fixed window before and after the requested data that falls on 64 KB boundaries. This increases cache hits when reading revlogs backwards. Running perfmoonwalk on the Mercurial repo (with almost 20,000 changesets) on Mac OS X with an SSD, before this change: $ hg perfmoonwalk ! wall 2.307994 comb 2.310000 user 2.120000 sys 0.190000 (best of 5) (Each run has 10,668 cache hits and 9,304 misses.) After this change: $ hg perfmoonwalk ! wall 1.814117 comb 1.810000 user 1.810000 sys 0.000000 (best of 6) (19,931 cache hits, 62 misses.) On a busy NFS share, before this change: $ hg perfmoonwalk ! wall 17.000034 comb 4.100000 user 3.270000 sys 0.830000 (best of 3) After: $ hg perfmoonwalk ! wall 1.746115 comb 1.670000 user 1.660000 sys 0.010000 (best of 5)

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debugshell.py
53 lines | 1.2 KiB | text/x-python | PythonLexer
Vishakh H
contrib: add debugshell extension
r11633 # debugshell extension
"""a python shell with repo, changelog & manifest objects"""
Sean Farley
debugshell: check ui.debugger for which debugger to use
r19773 import sys
Vishakh H
contrib: add debugshell extension
r11633 import mercurial
import code
Sean Farley
debugshell: abstract out pdb code.interact
r19771 def pdb(ui, repo, msg, **opts):
Vishakh H
contrib: add debugshell extension
r11633 objects = {
'mercurial': mercurial,
'repo': repo,
'cl': repo.changelog,
'mf': repo.manifest,
}
Sean Farley
debugshell: abstract out pdb code.interact
r19771
code.interact(msg, local=objects)
Sean Farley
debugshell: add function to embed ipython
r19772 def ipdb(ui, repo, msg, **opts):
import IPython
cl = repo.changelog
mf = repo.manifest
Matt Mackall
debugshell: appease pyflakes
r19794 cl, mf # use variables to appease pyflakes
Sean Farley
debugshell: add function to embed ipython
r19772
IPython.embed()
Sean Farley
debugshell: abstract out pdb code.interact
r19771 def debugshell(ui, repo, **opts):
Vishakh H
contrib: add debugshell extension
r11633 bannermsg = "loaded repo : %s\n" \
"using source: %s" % (repo.root,
mercurial.__path__[0])
Sean Farley
debugshell: abstract out pdb code.interact
r19771
Sean Farley
debugshell: check ui.debugger for which debugger to use
r19773 pdbmap = {
'pdb' : 'code',
'ipdb' : 'IPython'
}
debugger = ui.config("ui", "debugger")
if not debugger:
debugger = 'pdb'
# if IPython doesn't exist, fallback to code.interact
try:
__import__(pdbmap[debugger])
except ImportError:
ui.warn("%s debugger specified but %s module was not found\n"
% (debugger, pdbmap[debugger]))
debugger = 'pdb'
getattr(sys.modules[__name__], debugger)(ui, repo, bannermsg, **opts)
Vishakh H
contrib: add debugshell extension
r11633
cmdtable = {
"debugshell|dbsh": (debugshell, [])
}