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Re: Memory Leak: Uses 3GB+

by vek (Prior)
on Jan 15, 2009 at 21:19 UTC ( #736675=note: print w/replies, xml ) Need Help??

in reply to Memory Leak: Uses 3GB+

The code you posted accepts 5 arguments on the command line, performs an insert into a database, then exits. I don't see how this could leak memory. If you had a long running process that looped over a large amount of data and you saw the memory usage of your program increase as it ran, that would indicate a leak.

Keep an eye on just your process when running top

-- vek --

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Re^2: Memory Leak: Uses 3GB+
by kilimanjaro (Initiate) on Jan 17, 2009 at 10:03 UTC
    Thanks All for your reply. Was in transit for a day. The reason why im pointing perl is because i tried to disable it from the calling script (Asterisk PBX dialplan) and reboot the system. I then run for like 12 hours and the memory usage was as low as constant 350MB. I however couldnt keep on disabling as all are running on the production server to collect IVR statistics on different node. The script process about 100,000 request a day If any more info is required i will be glad to share for resolution Kind regards Kili

      Can you not get a full top listing that shows the memory allocated to the individual processes?

      My guess is that some or all of those other processes are dormant but non-zombied copies of your script that are not exiting. If each copy uses a modest 30MB and you have 100 of them sitting around in memory doing nothing, that will give your 3GB total memory usage.

      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

        I have just restarted the server and shall post as soon as mem get full again


        Check this out when running valgrind memory test on the previous posted perl script

        ==28945== Memcheck, a memory error detector. ==28945== Copyright (C) 2002-2008, and GNU GPL'd, by Julian Seward et +al. ==28945== Using LibVEX rev 1878, a library for dynamic binary translat +ion. ==28945== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP. ==28945== Using valgrind-3.4.0, a dynamic binary instrumentation frame +work. ==28945== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et +al. ==28945== For more details, rerun with: -v ==28945== ==28945== ==28945== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 29 from + 2) ==28945== malloc/free: in use at exit: 1,488,425 bytes in 28,258 block +s. ==28945== malloc/free: 47,397 allocs, 19,139 frees, 16,246,146 bytes a +llocated. ==28945== For counts of detected errors, rerun with: -v ==28945== searching for pointers to 28,258 not-freed blocks. ==28945== checked 2,423,200 bytes. ==28945== ==28945== 5 bytes in 1 blocks are definitely lost in loss record 1 of +18 ==28945== at 0x4004A41: malloc (vg_replace_malloc.c:207) ==28945== by 0x34D8E54: Perl_savesharedpv (in /usr/lib/perl5/5.8.5/ +i386-linux-thread-multi/CORE/ ==28945== by 0x3486313: (within /usr/lib/perl5/5.8.5/i386-linux-thr +ead-multi/CORE/ ==28945== by 0x348A23B: perl_parse (in /usr/lib/perl5/5.8.5/i386-li +nux-thread-multi/CORE/ ==28945== by 0x8049339: main (in /usr/bin/perl) ==28945== ==28945== ==28945== 13,767 (1,299 direct, 12,468 indirect) bytes in 14 blocks ar +e definitely lost in loss record 9 of 18 ==28945== at 0x4004A41: malloc (vg_replace_malloc.c:207) ==28945== by 0x34D9BDA: Perl_safesysmalloc (in /usr/lib/perl5/5.8.5 +/i386-linux-thread-multi/CORE/ ==28945== by 0x351D46F: Perl_new_stackinfo (in /usr/lib/perl5/5.8.5 +/i386-linux-thread-multi/CORE/ ==28945== by 0x3483D8A: Perl_init_stacks (in /usr/lib/perl5/5.8.5/i +386-linux-thread-multi/CORE/ ==28945== by 0x34841CB: perl_construct (in /usr/lib/perl5/5.8.5/i38 +6-linux-thread-multi/CORE/ ==28945== by 0x80492EE: main (in /usr/bin/perl) ==28945== ==28945== ==28945== 7,472 bytes in 3 blocks are definitely lost in loss record 1 +2 of 18 ==28945== at 0x4006081: realloc (vg_replace_malloc.c:429) ==28945== by 0x34DA8EB: Perl_safesysrealloc (in /usr/lib/perl5/5.8. +5/i386-linux-thread-multi/CORE/ ==28945== by 0x351D7C8: Perl_savestack_grow (in /usr/lib/perl5/5.8. +5/i386-linux-thread-multi/CORE/ ==28945== by 0x351E42C: Perl_save_I32 (in /usr/lib/perl5/5.8.5/i386 +-linux-thread-multi/CORE/ ==28945== by 0x34C3FDB: Perl_pad_block_start (in /usr/lib/perl5/5.8 +.5/i386-linux-thread-multi/CORE/ ==28945== by 0x34B24C9: Perl_block_start (in /usr/lib/perl5/5.8.5/i +386-linux-thread-multi/CORE/ ==28945== by 0x34AEBA5: Perl_yyparse (in /usr/lib/perl5/5.8.5/i386- +linux-thread-multi/CORE/ ==28945== by 0x35295CB: (within /usr/lib/perl5/5.8.5/i386-linux-thr +ead-multi/CORE/ ==28945== by 0x352AF7C: Perl_pp_require (in /usr/lib/perl5/5.8.5/i3 +86-linux-thread-multi/CORE/ ==28945== by 0x34D7DDC: Perl_runops_debug (in /usr/lib/perl5/5.8.5/ +i386-linux-thread-multi/CORE/ ==28945== by 0x3482AE5: (within /usr/lib/perl5/5.8.5/i386-linux-thr +ead-multi/CORE/ ==28945== by 0x3488E6A: Perl_call_sv (in /usr/lib/perl5/5.8.5/i386- +linux-thread-multi/CORE/ ==28945== ==28945== ==28945== 144,708 bytes in 14 blocks are possibly lost in loss record +17 of 18 ==28945== at 0x4004A41: malloc (vg_replace_malloc.c:207) ==28945== by 0x34D9BDA: Perl_safesysmalloc (in /usr/lib/perl5/5.8.5 +/i386-linux-thread-multi/CORE/ ==28945== by 0x34E4DE7: Perl_reentrant_init (in /usr/lib/perl5/5.8. +5/i386-linux-thread-multi/CORE/ ==28945== by 0x34843F0: perl_construct (in /usr/lib/perl5/5.8.5/i38 +6-linux-thread-multi/CORE/ ==28945== by 0x80492EE: main (in /usr/bin/perl) ==28945== ==28945== LEAK SUMMARY: ==28945== definitely lost: 8,776 bytes in 18 blocks. ==28945== indirectly lost: 12,468 bytes in 27 blocks. ==28945== possibly lost: 144,708 bytes in 14 blocks. ==28945== still reachable: 1,322,473 bytes in 28,199 blocks. ==28945== suppressed: 0 bytes in 0 blocks. ==28945== Reachable blocks (those to which a pointer was found) are no +t shown. ==28945== To see them, rerun with: --leak-check=full --show-reachable= +yes

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