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Re: 19991109: LDM memory leak on IRIX64
- Subject: Re: 19991109: LDM memory leak on IRIX64
- Date: Fri, 12 Nov 1999 08:39:47 -0700 (MST)
On Fri, 12 Nov 1999, Tom Yoksas wrote:
>
> Robb et. al.,
>
> Tom Engel of SCD sent me this note on the 9th. I just had today got to
> login and see it. Can you respond to Tom?
>
> Tom
>
> ------- Forwarded Message
>
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> Keywords: 199911091438.HAA17504
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> Tue, 9 Nov 1999 07:38:29 -0700 (MST)
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> Tue, 9 Nov 1999 07:38:29 -0700 (MST)
> Date: Tue, 9 Nov 1999 07:38:29 -0700 (MST)
> From: Tom Engel <address@hidden>
> Message-Id: <address@hidden>
> To: address@hidden, address@hidden
> Subject: LDM processes on dataproc
>
> Tom Yoksas, et.al.:
>
> It appears as if there's a relatively severe memory leak in the
> LDM processes ... specifically:
>
> Below are snapshots of the size of four LDM processes on dataproc
> at the beginning of each day over the last week. As you can see,
> each of the processes "rpc.ldmd", "pqexpire", "pqact" and "pqbinstat"
> have doubled in size during the last week.
>
Tom,
This is not a memory leak, here's the scoop. IRIX platforms permit the LDM
queue to grow as needed to accommodate the increase size of the
datastreams received. The LDM queue is a memory mapped file that is
accessed by the above mentioned programs, so ps reports it as part of the
size of each of these files. So as the LDM queue grows, then each of the
above programs sizes increases also. The fix is to stop the LDM and
increase the size of the LDM queue to accommodate the current data
streams. I'll let Tom Yoksas take care of this problem when he returns
from down under as this is not a critical problem.
Robb...
> Since dataproc is a production, interactive system, shared among
> numerous users, such unrestricted growth of daemons isn't good.
>
> A question:
> * Has UNIDATA seen such behavior in other systems? If so, what
> is UNIDATA's advice for dealing with this in an operational
> setting?
>
> Two suggestions:
> 1. the LDM system should be shut down and restarted on dataproc
> in order to return the memory back to users
> 2. UNIDATA should investigate and repair the memory leak.
>
> Thanks,
> Tom
> - ------------------------ Tom Engel --- Head, High Performance Systems
> Section
> Scientific Computing Division NCAR, P. O. Box 3000, Boulder, CO 80307-3000
> Phone 303-497-1270 Fax 303-497-1848 Pager 800-306-1988 (address@hidden)
>
>
> 991103
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 110208 254688 ? 33:51 ldmdp rpc.ldmd
>
> APS: 110016 254496 ? 22:07 ldmdp pqexpire
>
> APS: 109552 254560 ? 26:33 ldmdp pqact
>
> APS: 103392 254864 ? 28:30 ldmdp pqbinstat
>
>
> 991104
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 110352 254688 ? 42:16 ldmdp rpc.ldmd
>
> APS: 110160 254496 ? 25:54 ldmdp pqexpire
>
> APS: 109648 254560 ? 32:15 ldmdp pqact
>
> APS: 107584 254864 ? 33:45 ldmdp pqbinstat
>
>
> 991105
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 124976 254688 ? 59:13 ldmdp rpc.ldmd
>
> APS: 124784 254496 ? 34:53 ldmdp pqexpire
>
> APS: 123856 254560 ? 42:02 ldmdp pqact
>
> APS: 120656 254864 ? 42:03 ldmdp pqbinstat
>
>
> 991106
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 125008 254688 ? 72:07 ldmdp rpc.ldmd
>
> APS: 124784 254496 ? 41:24 ldmdp pqexpire
>
> APS: 123856 254560 ? 50:35 ldmdp pqact
>
> APS: 123632 254864 ? 49:03 ldmdp pqbinstat
>
>
> 991107
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 214992 254688 ? 87:11 ldmdp rpc.ldmd
>
> APS: 214768 254496 ? 49:05 ldmdp pqexpire
>
> APS: 213840 254560 ? 59:59 ldmdp pqact
>
> APS: 200240 254864 ? 57:03 ldmdp pqbinstat
>
>
> 991108
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 219376 254688 ? 93:27 ldmdp rpc.ldmd
>
> APS: 219152 254496 ? 53:15 ldmdp pqexpire
>
> APS: 218224 254560 ? 64:35 ldmdp pqact
>
> APS: 206016 254864 ? 61:25 ldmdp pqbinstat
>
>
> 991109
> APS: RESM(kB) TOTM(kB) TTY_____ USERTIME USER____ COMMAND________
>
> APS: 248432 254688 ? 101:10 ldmdp rpc.ldmd
>
> APS: 248176 254496 ? 58:07 ldmdp pqexpire
>
> APS: 247248 254560 ? 70:12 ldmdp pqact
>
> APS: 236368 254864 ? 66:45 ldmdp pqbinstat
>
> ------- End of Forwarded Message
>
===============================================================================
Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
address@hidden WWW: http://www.unidata.ucar.edu/
===============================================================================
