From: remi
Operating system: GNU/Linux
PHP version: 5.4.7
Package: Performance problem
Bug Type: Bug
Bug description:Lot of fstat call during include
Description:
------------
Hi,
Each "include" statement call fstat 3 time, which can be "slow" in some
cluster environment (usgin GFS2 p.e.)
Already open as #49383 (but closed as "not a bug")
The fstat cache is only available inside "plain_wrapper".
A solution could be to expose a stream_cached_stat (in
_php_stream_wrapper_ops) and use it during open process (or a additionnal
parameter to stream_stat).
But this will introduce a important bc break.
Test script:
---------------
Trivial test code:
test1.php: <?php include('test2.php'); echo "done\n";
test2.php: irrevelant, can even be empty
$ strace php test1.php
Expected result:
----------------
...
open("xxx/test2.php", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0664, st_size=20, ...}) = 0
mmap(NULL, 20, PROT_READ, MAP_SHARED, 3, 0) = 0x7f0d595da000
munmap(0x7f0d595da000, 20) = 0
close(3)
...
Actual result:
--------------
...
open("xxx/test2.php", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0664, st_size=20, ...}) = 0
fstat(3, {st_mode=S_IFREG|0664, st_size=20, ...}) = 0
fstat(3, {st_mode=S_IFREG|0664, st_size=20, ...}) = 0
mmap(NULL, 20, PROT_READ, MAP_SHARED, 3, 0) = 0x7f0d595da000
munmap(0x7f0d595da000, 20) = 0
close(3)
...
--
Edit bug report at https://bugs.php.net/bug.php?id=63160&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=63160&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=63160&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=63160&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=63160&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=63160&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=63160&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=63160&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=63160&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=63160&r=support
Expected behavior: https://bugs.php.net/fix.php?id=63160&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=63160&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=63160&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=63160&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=63160&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=63160&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=63160&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=63160&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=63160&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=63160&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=63160&r=mysqlcfg
