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Re: total memory of children processes
From: |
Jan-Henrik Haukeland |
Subject: |
Re: total memory of children processes |
Date: |
Wed, 10 Sep 2003 20:34:52 +0200 |
User-agent: |
Gnus/5.1002 (Gnus v5.10.2) XEmacs/21.4 (Reasonable Discussion, linux) |
Christian, do you thing you can you fix this? and if you can, will you
be able to fix it before early next week?
Does anyone have access to Solaris and can check if this problem occur
there also?
Martin Pala <address@hidden> writes:
> I see the same problem on my station too:
>
> unicorn:~/cvs/monit# ps -leaf
> F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY
> TIME CMD
> 1 S root 4890 1 0 69 0 - 2604 rt_sig 18:23 ?
> 00:00:00 /usr/sbin/slapd
> 1 S root 4891 4890 0 69 0 - 2604 poll 18:23 ?
> 00:00:00 /usr/sbin/slapd
> 1 S root 4892 4891 0 69 0 - 2604 select 18:23 ?
> 00:00:00 /usr/sbin/slapd
> 1 S root 4913 4891 0 69 0 - 2604 rt_sig 18:24 ?
> 00:00:00 /usr/sbin/slapd
>
> unicorn:~/cvs/monit# ./monit -c /etc/monitrc status
> Process 'slapd' is running with pid [4890]
> Uptime: 3m CPU: 0.0% Memory w/o children: 0.8% [2604kB]
> Children: 3 Memory w/ children: 3.2% [10416kB]
> Monitoring status: monitored
>
> As you can see, the reported size is sum of RSS off all threads
> (4*2604=10416). This is not correct result, because 2604kB is memory
> shared by threads (LinuxThreads reports each thread with its PID and
> size, but the memory is shared).
>
>
> Note: this is not related to /proc/kcore patch - it only replaced
> method for available memory detection (instead of kcore size it is
> read from /proc/meminfo - the result is the same) => this is
> standalone problem (bug).
>
> Martin
>
>
> Arkadiusz Miskiewicz wrote:
>
>>Hi,
>>
>>Total memory of children processes seems miscalculated:
>> Event: total mem amount of 12193680kB matches resource limit [total
>> mem amount>512001kB]
>>
>>ok but this machine has only 512MB ram and 2GB of swap.
>>
>> The problem seems be that only rss (resident set size) value is
>> used. rss also includes memory shared between processes.
>>
>>IMO algoritm to calculate total mem amount should looke like:
>>
>> rss of parent + (rss of first child - shared mem, rss of second
>> chold - shared mem and so on). It's still not perfect because we
>> don't know between which processes that memory is shared but it's
>> much better than adding whole rss.
>>
>>shared memory can be found in /proc/$pid/statm.
>>
>>On my server for httpd proces it's:
>>address@hidden root]# pmap -x 22746 |less
>>22746: httpd -4
>>Address kB Resident Shared Private Permissions Name
>>00110000 80 - 0 80 read/exec ld-2.2.5.so
>>00124000 4 - 0 4 read/write ld-2.2.5.so
>>00125000 8 - 0 8 read/write [ anon ]
>>00128000 4 - 0 4 read/exec mod_asis.so
>>[...]
>>01142000 980 - 980 0 read/write mod_jk2.shm
>>01237000 980 - 980 0 read/write mod_jk2.shm
>> 0132c000 508 - 508 0 read/write
>> SYSV00000000 (deleted)
>> 013ab000 364 - 364 0 read/write
>> SYSV00000000 (deleted)
>>08048000 212 - 0 212 read/exec httpd
>>0807d000 32 - 0 32 read/write httpd
>>08085000 63820 - 0 63820 read/write/exec [ anon ]
>> 40000000 32768 - 32768 0 read/write
>> SYSV00000000 (deleted)
>> 42000000 32768 - 32768 0 read/write
>> SYSV00000000 (deleted)
>>bfff5000 44 - 0 44 read/write/exec [ anon ]
>>-------- ------ ------ ------ ------
>>total kB 148912 - 71360 77552
>>
>> so almost half of memory used by this process is shared between
>> httpd (and other) processes...
>>
>>Comments?
>>
>
>
>
>
> _______________________________________________
> monit-dev mailing list
> address@hidden
> http://mail.nongnu.org/mailman/listinfo/monit-dev
>
--
Jan-Henrik Haukeland
- total memory of children processes, Arkadiusz Miskiewicz, 2003/09/10
- Re: total memory of children processes, Martin Pala, 2003/09/10
- Re: total memory of children processes,
Jan-Henrik Haukeland <=
- Re: total memory of children processes, Martin Pala, 2003/09/10
- Re: total memory of children processes, Christian Hopp, 2003/09/11
- Re: total memory of children processes, Christian Hopp, 2003/09/11
- Re: total memory of children processes, Christian Hopp, 2003/09/12
- Re: total memory of children processes, Jan-Henrik Haukeland, 2003/09/12
- Re: total memory of children processes, Christian Hopp, 2003/09/12
- Re: total memory of children processes, Martin Pala, 2003/09/12
- Re: total memory of children processes, Christian Hopp, 2003/09/12
- Re: total memory of children processes, Jan-Henrik Haukeland, 2003/09/12
- Re: total memory of children processes, Christian Hopp, 2003/09/12