On 1/3/11 14:47 , Wichert Akkerman wrote:
Pyramid seems to do a fair number of system calls when you use resource
overrides. For every page view in a site I have I see this in an strace:
[pid 15784]
stat("/srv/software/buildout/src/m18.site/m18/site/ui/templates/common.html",
{st_mode=S_IFREG|0644, st_size=52940, ...}) = 0
[pid 15784] lstat("/srv", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 15784] lstat("/srv/software", {st_mode=S_IFDIR|0755, st_size=4096,
...}) = 0
[pid 15784] lstat("/srv/software/buildout", {st_mode=S_IFDIR|0755,
st_size=4096, ...}) = 0
[pid 15784] lstat("/srv/software/buildout/src", {st_mode=S_IFDIR|0755,
st_size=4096, ...}) = 0
[pid 15784] lstat("/srv/software/buildout/src/m18.site",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 15784] lstat("/srv/software/buildout/src/m18.site/m18",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 15784] lstat("/srv/software/buildout/src/m18.site/m18/site",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 15784] lstat("/srv/software/buildout/src/m18.site/m18/site/ui",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 15784]
lstat("/srv/software/buildout/src/m18.site/m18/site/ui/templates",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 15784]
lstat("/srv/software/buildout/src/m18.site/m18/site/ui/templates/common.html",
{st_mode=S_IFREG|0644, st_size=52940, ...}) = 0
this only seems to happen for that single template, which is an XInclude
used from chameleon.genshi. Does this ring a bell for anyone?
This turned out to be caused by the XInclude hack from pyramid_genshi,
in particular this bit:
filename = os.path.realpath(filename)
template = self.registry.get(filename)
os.path.realpath does all those lstats. The three possible fixes I can
see are:
1. do not bother doing os.path.realpath and accept a few duplicates in
the registry
2. add a very stupid cache for os.path.realpath(filename) to the
instance
3. write a braindead os.path.realpath which only resolves relative paths
(ie turn '/one/two/thr33/../three' into '/one/two/three')
The second option is probably my favourite. If nobody comes up with an
alternative I'll implement that and give Chris a patch.
Wichert.
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