Bug #72322 [NEW]: High sys CPU usage

From: jai at vidyamantra dot com Operating system: Centos 6.8 x64 PHP version: 7.0.7 Package: Performance problem Bug Type: Bug Bug description:High sys CPU usage 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 bug report at https://bugs.php.net/bug.php?id=72322&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72322&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72322&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72322&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72322&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72322&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72322&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72322&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72322&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72322&r=support Expected behavior: https://bugs.php.net/fix.php?id=72322&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72322&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72322&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72322&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72322&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72322&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72322&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72322&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72322&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72322&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72322&r=mysqlcfg