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PHP Script memory usage with pmap

Discussion in 'General Discussion' started by lehels, May 25, 2010.

  1. lehels

    lehels Well-Known Member

    Jul 10, 2006
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    We have a situation with a PHP script running as a cronjob, which is reported with 91M memory used.

    I catched the pid with pmap and what i can observe the sum of the total memory reported is correct [ total 93320K ], but there is included a 64M usage:

    b3f52000 65536K rw-s- [ shmid=0x15dd8001 ]

    I repeated the process with 32M memory_limit in php.ini but the same 64M usage occurs:

    089d7000 3452K rw--- [ anon ]
    b3d3f000 772K rw--- [ anon ]
    b3ec0000 4K rw--- [ anon ]
    b3ec1000 65536K rw-s- [ shmid=0x15e30003 ]
    b7f02000 44K rw--- [ anon ]
    b7f15000 4K rw--- [ anon ]
    bfd3c000 84K rwx-- [ stack ]
    total 93312K

    According to the pmap docs:
    The mapping is a System V shared memory mapping. The shared memory identifier that the mapping was created with is reported."

    Why would this peak of memory being generated?

    Kernel: 2.6.18-92.1.10.el5PAE #1 SMP Tue Aug 5 08:14:05 EDT 2008 i686 i686 i386 GNU/Linux

    cPanel 11.25.0-S45750 - WHM 11.25.0 - X 3.9
    CENTOS 5.5 i686 standard on serverXX

    Thank you,


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