ID: 49383 User updated by: olga at metacafe dot com Reported By: olga at metacafe dot com -Status: Feedback +Status: Open Bug Type: Performance problem Operating System: Red Hat 3.4.6-10 PHP Version: 5.3.0 New Comment:
Used the snapshot, nothing changed. Fstat() remains high. Previous Comments: ------------------------------------------------------------------------ [2009-08-29 00:26:57] j...@php.net Please try using this snapshot: http://snaps.php.net/php5.3-latest.tar.gz For Windows: http://windows.php.net/snapshots/ ------------------------------------------------------------------------ [2009-08-27 07:54:43] olga at metacafe dot com Description: ------------ Hi, We recently upgraded our web servers with PHP 5.3 and found out that there are lots of empty fstat system calls. fstat is called 3 times on each file open. This does not happen on PHP 5.2.9. PHP 5.2.9 shows better results in benchmarking vs. 5.3.0, and I suppose it's because of the fstat. We're running Red Hat 3.4.6, Apache 2.0.59, PHP 5.3.0 Reproduce code: --------------- Any code that loads PHP file. Expected result: ---------------- Strace summary from 5.2.9 % time seconds usecs/call calls errors syscall 44.65 34.487815 159 217129 26 lstat 8.73 6.743625 170 39745 145 stat 8.23 6.355874 170 37466 18 open 8.21 6.345542 167 38091 close 7.99 6.170706 165 37410 fstat Strace summary from 5.3.0 % time seconds usecs/call calls errors syscall 22.64 28.292541 301 93945 fstat 18.39 22.979631 312 73713 110 lstat 9.23 11.529433 311 37131 munmap 9.14 11.417404 306 37277 mmap 8.52 10.643572 306 34755 149 stat Actual result: -------------- Strace result. I replaced full path by [path] open("[path]/Flash.php", O_RDONLY) = 21 fstat(21, {st_mode=S_IFREG|0777, st_size=23902, ...}) = 0 fstat(21, {st_mode=S_IFREG|0777, st_size=23902, ...}) = 0 fstat(21, {st_mode=S_IFREG|0777, st_size=23902, ...}) = 0 mmap(NULL, 23902, PROT_READ, MAP_SHARED, 21, 0) = 0x2a971a2000 stat("[path]/Flash.php", {st_mode=S_IFREG|0777, st_size=23902, ...}) = 0 munmap(0x2a971a2000, 23902) = 0 close(21) = 0 lstat("[path]/VTalkNotification.php", {st_mode=S_IFREG|0777, st_size=778, ...}) = 0 lstat("[path]/VTalkNotification.php", {st_mode=S_IFREG|0777, st_size=778, ...}) = 0 open("[path]/VTalkNotification.php", O_RDONLY) = 21 fstat(21, {st_mode=S_IFREG|0777, st_size=778, ...}) = 0 fstat(21, {st_mode=S_IFREG|0777, st_size=778, ...}) = 0 fstat(21, {st_mode=S_IFREG|0777, st_size=778, ...}) = 0 mmap(NULL, 778, PROT_READ, MAP_SHARED, 21, 0) = 0x2a971a2000 stat("[path]/VTalkNotification.php", {st_mode=S_IFREG|0777, st_size=778, ...}) = 0 munmap(0x2a971a2000, 778) = 0 close(21) = 0 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49383&edit=1
