Mercurial > hg
annotate hgweb.cgi @ 30212:260af19891f2
changegroup: increase write buffer size to 128k
By default, Python defers to the operating system for choosing the
default buffer size on opened files. On my Linux machine, the default
is 4k, which is really small for 2016.
This patch bumps the write buffer size when writing
changegroups/bundles to 128k. This matches the 128k read buffer
we already use on revlogs.
It's worth noting that this only impacts when writing to an explicit
file (such as during `hg bundle`). Buffers when writing to bundle
files via the repo vfs or to a temporary file are not impacted.
When producing a none-v2 bundle file of the mozilla-unified repository,
this change caused the number of write() system calls to drop from
952,449 to 29,788. After this change, the most frequent system
calls are fstat(), read(), lseek(), and open(). There were
2,523,672 system calls after this patch (so a net decrease of
~950k is statistically significant).
This change shows no performance change on my system. But I have a
high-end system with a fast SSD. It is quite possible this change
will have a significant impact on network file systems, where
extra network round trips due to excessive I/O system calls could
introduce significant latency.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 16 Oct 2016 13:35:23 -0700 |
parents | 4b0fc75f9403 |
children | 47ef023d0165 |
rev | line source |
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202 | 1 #!/usr/bin/env python |
159 | 2 # |
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3 # An example hgweb CGI script, edit as necessary |
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urls: bulk-change primary website URLs
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4 # See also https://mercurial-scm.org/wiki/PublishingRepositories |
159 | 5 |
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6 # Path to repo or hgweb config to serve (see 'hg help hgweb') |
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7 config = "/path/to/repo/or/config" |
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cgi: sys.path.insert should be before importing mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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8 |
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hgweb: add hint about finding library path with debuginstall
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9 # Uncomment and adjust if Mercurial is not installed system-wide |
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10 # (consult "installed modules" path from 'hg debuginstall'): |
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11 #import sys; sys.path.insert(0, "/path/to/python/lib") |
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Enable demandimport only in scripts, not in importable modules (issue605)
Thomas Arendsen Hein <thomas@intevation.de>
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12 |
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hgweb: disable cgitb by default
Maxim Dounin <mdounin@mdounin.ru>
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13 # Uncomment to send python tracebacks to the browser if an error occurs: |
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14 #import cgitb; cgitb.enable() |
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hgweb: pull cgitb into CGI script example, where it can easily be disabled
mpm@selenic.com
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15 |
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hgweb: simplify hgweb.cgi, add help pointer
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16 from mercurial import demandimport; demandimport.enable() |
338167735124
hgweb: simplify hgweb.cgi, add help pointer
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parents:
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17 from mercurial.hgweb import hgweb, wsgicgi |
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18 application = hgweb(config) |
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Backed out changeset b913d3aacddc (see issue971/msg5317)
Thomas Arendsen Hein <thomas@intevation.de>
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19 wsgicgi.launch(application) |