Bug #72322 [Opn->Fbk]: High sys CPU usage

From:	nikic@php.net	Date:	Sat, 17 Dec 2016 14:51:27 +0000
Subject:	Bug #72322 [Opn->Fbk]: High sys CPU usage
References:	1	Groups:	php.bugs
Request:	Send a blank email to php-bugs+get-206096@lists.php.net to get a copy of this message

Edit report at https://bugs.php.net/bug.php?id=72322&edit=1

 ID:                 72322
 Updated by:         nikic@php.net
 Reported by:        jai at vidyamantra dot com
 Summary:            High sys CPU usage
-Status:             Open
+Status:             Feedback
 Type:               Bug
 Package:            Performance problem
 Operating System:   Centos 6.8 x64
 PHP Version:        7.0.7
 Block user comment: N
 Private report:     N

 New Comment:

Do you still experience this problem with a current version of PHP 7? I'd assume the issue is
due to huge pages (see https://bugs.php.net/bug.php?id=70984), which are
no longer enabled by default.


Previous Comments:
------------------------------------------------------------------------
[2016-06-03 06:58:47] jai at vidyamantra dot com

Description:
------------
Upgrade to php 7 and saw high CPU usage.
http://serverfault.com/q/780555/126826 (CPU
graphs and sar output).

==== PHP 7 ====
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 31.24    0.000973           1      1204           munmap
 15.25    0.000475           0      1523         3 open
 12.52    0.000390           0      4012       216 lstat
  7.70    0.000240           0      1363           mmap
  5.81    0.000181           0      1528           close
  5.36    0.000167           1       219           getdents
  5.01    0.000156           0      1618           stat
  4.33    0.000135           0      1433       535 access
  3.69    0.000115           0      3256           fstat
  2.47    0.000077           0       547           write
  1.67    0.000052           0       224           uname
  1.22    0.000038           0       276           sendto
  0.87    0.000027           0       638           read
  0.83    0.000026           0       752           flock
  0.58    0.000018           0       760           poll

==== PHP 5 ====
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 23.32    0.001103           5       206           sendto
 17.45    0.000825           1      1650           getdents
 14.95    0.000707           0      4638       651 stat
 10.59    0.000501           0      3181      1708 access
  7.27    0.000344           0      4918       172 lstat
  6.07    0.000287           0      2391         3 open
  4.76    0.000225           1       314           poll
  3.66    0.000173           0      1526           munmap
  2.56    0.000121           0      4633           fstat
  2.11    0.000100           0      1704           mmap
  1.54    0.000073           1        97           rename
  1.40    0.000066           0       923         2 lseek
  1.08    0.000051           0      2395           close
  0.80    0.000038           0       562        49 ioctl
  0.68    0.000032           0       831           read
  0.57    0.000027           0       406           write
  0.34    0.000016           0       141           mprotect



------------------------------------------------------------------------



--
Edit this bug report at https://bugs.php.net/bug.php?id=72322&edit=1


   

Thread (11 messages)

• jai at vidyamantra dot comFri, 03 Jun 2016 06:58:54 +0000
  • nikic@php.netSat, 17 Dec 2016 14:51:27 +0000Bug #72322 [Opn->Fbk]: High sys CPU usage
  • jai at vidyamantra dot comTue, 20 Dec 2016 07:33:33 +0000Bug #72322 [Com]: High sys CPU usage
  • php-bugs at lists dot php dot netSun, 25 Dec 2016 04:22:19 +0000Bug #72322 [Fbk->NoF]: High sys CPU usage
  • nikic@php.netSun, 25 Dec 2016 10:45:39 +0000Bug #72322 [NoF->ReO]: High sys CPU usage
  • jai at vidyamantra dot comFri, 20 Jan 2017 09:16:13 +0000Bug #72322 [Com]: High sys CPU usage
  • wym1 at meitu dot comThu, 21 Sep 2017 02:32:16 +0000Bug #72322 [Com]: High sys CPU usage
  • jai at vidyamantra dot comThu, 21 Sep 2017 03:07:31 +0000Bug #72322 [Com]: High sys CPU usage
  • pavel2000 at ngs dot ruWed, 06 Dec 2017 11:44:15 +0000Bug #72322 [Com]: High sys CPU usage
  • nikic@php.netTue, 16 Jul 2019 10:37:10 +0000Bug #72322 [ReO->Fbk]: High sys CPU usage
  • php-bugs at lists dot php dot netSun, 28 Jul 2019 04:22:05 +0000Bug #72322 [Fbk->NoF]: High sys CPU usage