help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Fri, 07/29/2011 - 11:29
Hi
I am getting below error messages in my /var/log/messages
Swap gets out. and then processes are killed one by one.. sh,httpd2-
prefork,osiris.cgi repeating the same logs.. as below
Please somebody help why this is happening, what could be the cause of
the problem? what is oom-killer and why it gets invoked?
Jul 28 01:42:10 APP0001 kernel: sshd invoked oom-killer:
gfp_mask=0x1201d2, order=0, oomkilladj=0
Jul 28 01:42:10 APP0001 kernel: Pid: 16401, comm: sshd Not tainted
2.6.27.19-5-xen #1
Jul 28 01:42:10 APP0001 kernel:
Jul 28 01:42:10 APP0001 kernel: Call Trace:
Jul 28 01:42:10 APP0001 kernel: [
show_trace_log_lvl+0x41/0x58
Jul 28 01:42:10 APP0001 kernel: [
+0x69/0x6f
Jul 28 01:42:10 APP0001 kernel: [
+0x5c/0x227
Jul 28 01:42:10 APP0001 kernel: [
+0xdd/0x10d
Jul 28 01:42:10 APP0001 kernel: [
__alloc_pages_internal+0x2ef/0x3f7
Jul 28 01:42:10 APP0001 kernel: [
__do_page_cache_readahead+0x94/0x194
Jul 28 01:42:10 APP0001 kernel: [
force_page_cache_readahead+0x57/0x7e
Jul 28 01:42:10 APP0001 kernel: [
sys_fadvise64_64+0x11e/0x190
Jul 28 01:42:10 APP0001 kernel: [
system_call_fastpath+0x16/0x1b
Jul 28 01:42:10 APP0001 kernel: [<00007f2ac4a576dd>] 0x7f2ac4a576dd
Jul 28 01:42:10 APP0001 kernel:
Jul 28 01:42:10 APP0001 kernel: Mem-Info:
Jul 28 01:42:10 APP0001 kernel: DMA per-cpu:
Jul 28 01:42:10 APP0001 kernel: CPU 0: hi: 0, btch: 1 usd: 0
Jul 28 01:42:10 APP0001 kernel: CPU 1: hi: 0, btch: 1 usd: 0
Jul 28 01:42:10 APP0001 kernel: CPU 2: hi: 0, btch: 1 usd: 0
Jul 28 01:42:10 APP0001 kernel: CPU 3: hi: 0, btch: 1 usd: 0
Jul 28 01:42:10 APP0001 kernel: DMA32 per-cpu:
Jul 28 01:42:10 APP0001 kernel: CPU 0: hi: 186, btch: 31 usd: 176
Jul 28 01:42:10 APP0001 kernel: CPU 1: hi: 186, btch: 31 usd: 179
Jul 28 01:42:10 APP0001 kernel: CPU 2: hi: 186, btch: 31 usd: 158
Jul 28 01:42:10 APP0001 kernel: CPU 3: hi: 186, btch: 31 usd: 94
Jul 28 01:42:10 APP0001 kernel: Active:503042 inactive:505023 dirty:0
writeback:0 unstable:0
Jul 28 01:42:10 APP0001 kernel: free:4576 slab:2988 mapped:1
pagetables:0 bounce:0
Jul 28 01:42:10 APP0001 kernel: DMA free:10340kB min:28kB low:32kB
high:40kB active:0kB inactive:0kB present:16128kB pages_scanned:0
all_unreclaimable? ye
s
Jul 28 01:42:10 APP0001 kernel: lowmem_reserve[]: 0 4016 4016 4016
Jul 28 01:42:10 APP0001 kernel: DMA32 free:7964kB min:8092kB low:
10112kB high:12136kB active:2012168kB inactive:2020092kB present:
4112640kB pages_scanned:
7556254 all_unreclaimable? yes
Jul 28 01:42:10 APP0001 kernel: lowmem_reserve[]: 0 0 0 0
Jul 28 01:42:10 APP0001 kernel: DMA: 1*4kB 2*8kB 1*16kB 0*32kB 3*64kB
1*128kB 1*256kB 1*512kB 1*1024kB 2*2048kB 1*4096kB = 10340kB
Jul 28 01:42:10 APP0001 kernel: DMA32: 37*4kB 5*8kB 4*16kB 3*32kB
1*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 1*4096kB = 7964kB
Jul 28 01:42:10 APP0001 kernel: 52 total pagecache pages
Jul 28 01:42:10 APP0001 kernel: 0 pages in swap cache
Jul 28 01:42:10 APP0001 kernel: Swap cache stats: add 4269236, delete
4269236, find 8801268/8935257
Jul 28 01:42:10 APP0001 kernel: Free swap = 0kB
Jul 28 01:42:10 APP0001 kernel: Total swap = 2104472kB
Jul 28 01:42:10 APP0001 kernel: 1048576 pages RAM
Jul 28 01:42:10 APP0001 kernel: 23652 pages reserved
Jul 28 01:42:10 APP0001 kernel: 1899 pages shared
Jul 28 01:42:10 APP0001 kernel: 1018508 pages non-shared
Jul 28 01:42:10 APP0001 kernel: Out of memory: kill process 8623 (sh)
score 48420 or a child
Jul 28 01:42:10 APP0001 kernel: Killed process 12844 (osiris.cgi)
Thanks
Niyati
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Squid big log file:
.bashrc — Thu, 01/26/2012 - 04:30Hello,
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help to understand kernel logs: sshd invoked oom-killer:
Alok Thaker — Fri, 07/29/2011 - 12:30Hi,
The problem with Linux is that by default it overcommits memory –
basically when you do a malloc on linux it doesn’t reserve ane swap
areay (memory + swap disk) and alway returns as successful. Then if you
have couple of programs and all of them actually do want to use the
memory the problem starts as system is running out of memory but there
is basically no interface to tell it to applications as it already told
all of them that there is enough of it… so it starts killing application
in order to avoid complete lock so there oom-killer is invoked when linux overcommits the memory for the processes whereas in case of solaris that's not the case.
To prevent it you can do echo 2 > /proc/sys/vm/overcommit_memory
Thanks & Regards,
Alok
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Fri, 07/29/2011 - 12:30Hi
thanks for your response
just a few queries.. does this occur because process start utilising high memory or the number of processes running increase on the server?
I could see the above logs continuously: like at one instance it says :
kernel: httpd2-prefork invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
....
then after a few seconds
kernel: osiris.cgi invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
....
Kernel: cron invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
....
How can i interprete which process is actully causing the memory issue and triggering oom-killer? cron, httpd2-prefork, sshd.. ?
Thanks again
Thanks & Regards,
Alok
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help to understand kernel logs: sshd invoked oom-killer:
kandarp thaker — Fri, 07/29/2011 - 12:30leakage https://bugzilla.redhat.com/show_bug.cgi?id=497077 this gives u
more insight. Are you using rhel5. Then after some time it goes on
killing other processes to free up the memory.
Thanks,
Kandarp
IT Admin-Consultant
Inferno Solutions
Go with the best
www.inferno.co.in
All Linux-Java-Web-Voip Solutions-Training under one Roof
M:-9978926593
kernel: httpd2-prefork invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
....
then after a few seconds
kernel: osiris.cgi invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
....
Kernel: cron invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
....
How can i interprete which process is actully causing the memory issue and triggering oom-killer? cron, httpd2-prefork, sshd.. ?
Thanks again
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Fri, 07/29/2011 - 13:30Thanks again
bt this is not rhel , I have the server suselinux version 11
IN the logs the processes which invoked oom-killer are sshd, then top, httpd2-prefork and then osiris.cgi.
After a few minutes the server was normal so that is why I am not able to make out what actully may have caused the problem.
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help to understand kernel logs: sshd invoked oom-killer:
Nirmal Pathak — Fri, 07/29/2011 - 16:30From the oom-kill messages I can see that the system has exhausted Swap Memory
--
Jul 28 01:42:10 APP0001 kernel: Free swap = 0kB
--
I would suggest to increase Swap Space on the system prior to setting any memory related tunable on the system.
It is difficult from logs to find exact process which triggered the oom-kill.
Out of Memory occurs when the system memory is exhausted on the system and kernel tries to recover the memory by killing various process on the system which is consuming more memory.
You have to monitor your system continuously to find the cause!
This does not seem to be httpd issue to me. Issue occurred as system had exhausted memory including the swap memory.
M:-9978926593
It could be both! :)
As mentioned above when system is under heavy memory load, the kernel starts killing processes which are consuming high memory on the system.
Have FuN!
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Fri, 07/29/2011 - 18:30Hello Sir,
thanks for the response and explaination:
1 query I have the physical memory : 4102 M
and swap space : 2055 M
Is it recommended to increase the swap more?
Thanks
Niyati
It could be both! :)
As mentioned above when system is under heavy memory load, the kernel starts killing processes which are consuming high memory on the system.
Have FuN!
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FOSS gives that.
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Squid big log file:
.bashrc — Wed, 02/01/2012 - 02:30Sorry Nishith for being late. Actually, access.log is critical for me. I parse it on daily basis so I cant rotate logs multiple times a day. I just wanted to skip the log entries with particular method(like None) so that it does not gets bulky so early.
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Squid big log file:
Nirmal Pathak — Wed, 02/01/2012 - 12:30On Wednesday, February 1, 2012 1:39:55 AM UTC+5:30, .bashrc wrote:
You can try rotating logs using cron job. Check following link,
http://wiki.squid-cache.org/SquidFaq/SquidLogs#My_log_files_get_very_big.21
You can not simply filter the TCP_DENIED logs from log files. You will have to change the code of squid. :)
- Nirmal D Pathak.
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Squid big log file:
.bashrc — Thu, 02/02/2012 - 12:30Or I seem to get to a solution. I can write a cron job by which I am parsing access.log periodically, say 2 hrs skipping the lines having None or/and TCP_DENIED in 4th and 7th field. Am I wrong anywhere(inspite a little overhead :) )?
You can try rotating logs using cron job. Check following link,
http://wiki.squid-cache.org/SquidFaq/SquidLogs#My_log_files_get_very_big.21
You can not simply filter the TCP_DENIED logs from log files. You will have to change the code of squid. :)
- Nirmal D Pathak.
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Squid big log file:
nehal dattani — Thu, 02/02/2012 - 20:30Hi,
This is what you have asked for.
"Is there any way so that I can prevent such entries from writing to access.log.
"
Therefore we are focused on preventing unwanted entries in log. Of-cousre you can parse it periodically with certain conditions but these entries are still there in log file.
So its your choice, how to deal with log files. For a busy server, avoiding unwanted I/O is a good step to increase performance.
With best regards,
Nehal Dattani
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Squid big log file:
nehal dattani — Thu, 02/02/2012 - 11:30Hi,
There is a little hack.
You can specify "none" for all those acl's which you do not want to log.
Example:
access_log none [acl acl ...]
Please refer to description of "TAG: access_log" in squid.conf file for more details.
Regards,
Nehal Dattani
- Nirmal D Pathak.
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help to understand kernel logs: sshd invoked oom-killer:
ElectroMech — Mon, 08/01/2011 - 09:30Hi,
Can you give us more idea what services are provided by server ?
Mostly 4 G Memory is good, still depends on what application you served. Still we can change some parameters within application ( for memory utilization) so OOM-KILLER should not occurs.
Thanks and Regards.
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Mon, 08/01/2011 - 11:30Hello all
I have read the above discussion, so I would like to clarify a few things.. the kernel is a latest one as provided by the suselinux enterprise server and version 11 - so the latest one. The server is a xen guest and applications running on the server is just apache, postfix. But yes it has a good usage of apache application and there are few cron scripts related to emailing, cgi. And as per the logs too after giving out of memory error related to swap then oom-killer started killing sh, httpd-prefork, top, the script.
Thanks again
Niyati
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Mon, 08/01/2011 - 14:30Hi all
I am continuously facing the same logs and problem again. I want to try out increasing the swap. What I know is creating a swap file or a new swap partition. Is there any way to increase the present swap which is already of 2G.
Waiting for resonse
Thanks
Niyati
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Lan-port configuration problem:
.bashrc — Thu, 01/12/2012 - 12:30Hello,
I have IBM x3450 rack server with two identical racks with 3 ethernet interfaces interfaces on each. I just tried to configure them on 1000baseT-FD mode using mii-tools and ethtool. It worked on all except one that refuses to come up on 1000baseT mode. It, then, goes in 100baseT mode and denies to set up on 1000Mbps mode. Any help appreciated.
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RE: Lan-port configuration problem:
Arvind Patel — Thu, 01/12/2012 - 12:30plaese check with your network switch , it is supported up to 1Gbps or not?
Regards..
Arvind
From: dineshsohu@gmail.com
Date: Thu, 12 Jan 2012 11:52:54 +0530
Subject: [VGLUG] Lan-port configuration problem:
To: vglug@googlegroups.com
Hello,
I have IBM x3450 rack server with two identical racks with 3 ethernet interfaces interfaces on each. I just tried to configure them on 1000baseT-FD mode using mii-tools and ethtool. It worked on all except one that refuses to come up on 1000baseT mode. It, then, goes in 100baseT mode and denies to set up on 1000Mbps mode. Any help appreciated.
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Lan-port configuration problem:
.bashrc — Thu, 01/12/2012 - 13:30The network switch is configured to 1Gbps on all ports coz the other machine is connected on same switch. Also I crosschecked with switch admin. One thing, how can I find out h/w capabilities of a ethernet port.(I am using debian)
Date: Thu, 12 Jan 2012 11:52:54 +0530
Subject: [VGLUG] Lan-port configuration problem:
To: vglug@googlegroups.com
Hello,
I have IBM x3450 rack server with two identical racks with 3 ethernet interfaces interfaces on each. I just tried to configure them on 1000baseT-FD mode using mii-tools and ethtool. It worked on all except one that refuses to come up on 1000baseT mode. It, then, goes in 100baseT mode and denies to set up on 1000Mbps mode. Any help appreciated.
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help to understand kernel logs: sshd invoked oom-killer:
ElectroMech — Mon, 08/01/2011 - 16:30Hi,
Waiting for resonse
[root@nilesh ~]# top -b -u apache -n 1
Might suggest you soemthing valueable.
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ElectroMech Corporation
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Mon, 08/01/2011 - 16:30Below is the output of top -b -u wwwrun -n 1
top - 12:58:50 up 130 days, 1:46, 1 user, load average: 22.64, 22.90, 20.38
Tasks: 127 total, 19 running, 107 sleeping, 0 stopped, 1 zombie
Cpu(s): 9.7%us, 0.4%sy, 0.0%ni, 89.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.1%st
Mem: 4201096k total, 4061640k used, 139456k free, 12768k buffers
Swap: 2104472k total, 1126172k used, 978300k free, 69968k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
16057 wwwrun 20 0 97364 27m 6300 R 28 0.7 0:02.52 osiris.cgi
12918 wwwrun 20 0 154m 87m 6516 R 26 2.1 4:29.78 osiris.cgi
32376 wwwrun 20 0 839m 456m 860 R 26 11.1 29:21.22 osiris.cgi
2111 wwwrun 20 0 778m 456m 860 R 24 11.1 25:33.46 osiris.cgi
3033 wwwrun 20 0 757m 459m 860 R 24 11.2 24:19.25 osiris.cgi
11107 wwwrun 20 0 273m 206m 6516 R 24 5.0 8:17.03 osiris.cgi
11543 wwwrun 20 0 154m 87m 6516 R 24 2.1 7:15.97 osiris.cgi
12162 wwwrun 20 0 154m 87m 6516 R 24 2.1 5:43.74 osiris.cgi
12911 wwwrun 20 0 154m 87m 6516 R 24 2.1 4:29.74 osiris.cgi
16105 wwwrun 20 0 97336 17m 6172 R 24 0.4 0:01.20 osiris.cgi
12742 wwwrun 20 0 154m 87m 6516 R 22 2.1 4:36.37 osiris.cgi
10224 wwwrun 20 0 456m 389m 6516 R 20 9.5 11:18.80 osiris.cgi
12740 wwwrun 20 0 154m 87m 6516 R 20 2.1 3:59.65 osiris.cgi
14356 wwwrun 20 0 140m 73m 6516 R 20 1.8 1:57.56 osiris.cgi
16015 wwwrun 20 0 143m 76m 6348 R 20 1.9 0:06.58 osiris.cgi
1870 wwwrun 20 0 773m 464m 860 R 18 11.3 25:29.98 osiris.cgi
9615 wwwrun 20 0 540m 445m 6516 R 16 10.9 13:34.17 osiris.cgi
15622 wwwrun 20 0 91940 2784 1832 S 4 0.1 0:00.08 httpd2-prefork
834 wwwrun 20 0 92168 352 4 S 0 0.0 0:00.30 httpd2-prefork
1532 wwwrun 20 0 92196 2664 1492 S 0 0.1 0:00.10 httpd2-prefork
1545 wwwrun 20 0 91940 352 4 S 0 0.0 0:00.08 httpd2-prefork
2076 wwwrun 20 0 91940 352 4 S 0 0.0 0:00.00 httpd2-prefork
2389 wwwrun 20 0 91924 352 4 S 0 0.0 0:03.66 httpd2-prefork
2554 wwwrun 20 0 92024 352 4 S 0 0.0 0:00.04 httpd2-prefork
4047 wwwrun 20 0 91928 352 4 S 0 0.0 0:00.08 httpd2-prefork
4065 wwwrun 20 0 91928 352 4 S 0 0.0 0:00.04 httpd2-prefork
4069 wwwrun 20 0 91936 352 4 S 0 0.0 0:00.06 httpd2-prefork
4089 wwwrun 20 0 43608 8 4 S 0 0.0 0:00.00 osiris.cgi
4167 wwwrun 20 0 91804 352 4 S 0 0.0 0:00.00 httpd2-prefork
4176 wwwrun 20 0 91924 352 4 S 0 0.0 0:00.02 httpd2-prefork
5449 wwwrun 20 0 94500 352 4 S 0 0.0 0:00.20 httpd2-prefork
9022 wwwrun 20 0 94652 2432 1868 S 0 0.1 0:00.14 httpd2-prefork
9221 wwwrun 20 0 92168 2740 1888 S 0 0.1 0:00.22 httpd2-prefork
9733 wwwrun 20 0 94744 5720 1952 S 0 0.1 0:00.34 httpd2-prefork
11196 wwwrun 20 0 91940 2784 1824 S 0 0.1 0:00.06 httpd2-prefork
11612 wwwrun 20 0 92192 3184 1920 S 0 0.1 0:00.20 httpd2-prefork
12322 wwwrun 20 0 92988 3308 1432 S 0 0.1 0:00.96 httpd2-prefork
12388 wwwrun 20 0 92060 2880 1788 S 0 0.1 0:00.06 httpd2-prefork
12870 wwwrun 20 0 91804 2428 1588 S 0 0.1 0:00.00 httpd2-prefork
12881 wwwrun 20 0 91804 2388 1564 S 0 0.1 0:00.00 httpd2-prefork
13992 wwwrun 20 0 91960 3120 2016 S 0 0.1 0:00.30 httpd2-prefork
14202 wwwrun 20 0 91924 2692 1756 S 0 0.1 0:00.02 httpd2-prefork
15199 wwwrun 20 0 92168 3152 1864 S 0 0.1 0:00.10 httpd2-prefork
15300 wwwrun 20 0 92668 3524 1864 S 0 0.1 0:00.08 httpd2-prefork
15308 wwwrun 20 0 91948 2952 1872 S 0 0.1 0:00.08 httpd2-prefork
15444 wwwrun 20 0 91936 2936 1876 S 0 0.1 0:00.06 httpd2-prefork
15581 wwwrun 20 0 92112 3036 1868 S 0 0.1 0:00.08 httpd2-prefork
15617 wwwrun 20 0 92056 2916 1772 S 0 0.1 0:00.04 httpd2-prefork
15839 wwwrun 20 0 91968 2920 1844 S 0 0.1 0:00.04 httpd2-prefork
15864 wwwrun 20 0 91924 2544 1612 S 0 0.1 0:00.02 httpd2-prefork
15978 wwwrun 20 0 91940 2544 1624 S 0 0.1 0:00.00 httpd2-prefork
16001 wwwrun 20 0 0 0 0 Z 0 0.0 0:00.00 httpd2-prefork <defunct>
16017 wwwrun 20 0 91928 2684 1748 S 0 0.1 0:00.02 httpd2-prefork
31900 wwwrun 20 0 91924 352 4 S 0 0.0 0:00.04 httpd2-prefork
404, Maulik arcade, Above Karnavati Pagarakha Bazar,
Nr. Mansi cross Road,
Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
www.electromech.info
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help to understand kernel logs: sshd invoked oom-killer:
ElectroMech — Mon, 08/01/2011 - 19:30Hi,
Mem: 4201096k total, 4061640k used, 139456k free, 12768k buffers
Swap: 2104472k total, 1126172k used, 978300k free, 69968k cached
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20 <============== check this value try to reduce it to half from actual value
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 4000
</IfModule>
Thanks and Regards.
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(RHCSA RHCE)
ElectroMech Corporation
Redhat Channel Partner and Training Partner
404, Maulik arcade, Above Karnavati Pagarakha Bazar,
Nr. Mansi cross Road,
Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Mon, 08/01/2011 - 19:30I have the value of MaxSpareServers 10. Should I still try changing.
Thanks and Regards.
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(RHCSA RHCE)
ElectroMech Corporation
Redhat Channel Partner and Training Partner
404, Maulik arcade, Above Karnavati Pagarakha Bazar,
Nr. Mansi cross Road,
Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
www.electromech.info
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help to understand kernel logs: sshd invoked oom-killer:
ElectroMech — Mon, 08/01/2011 - 20:30Hi,
Always check top and free -m.
Check it should not utilize swap Memory, if used should temporary.
Check also uptime for load average should not be greater than total logical cpu.
If you want change for performance should change following value without increasing usage of memory.
# worker MPM
# StartServers: initial number of server processes to start
# MaxClients: maximum number of simultaneous client connections
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>
Let us know the impact and check the log.
Can you provide again the output of above ?
Remember to restart the apache.
--
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Nilesh Vaghela
(RHCSA RHCE)
ElectroMech Corporation
Redhat Channel Partner and Training Partner
404, Maulik arcade, Above Karnavati Pagarakha Bazar,
Nr. Mansi cross Road,
Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
www.electromech.info
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help to understand kernel logs: sshd invoked oom-killer:
Niyati Dave — Mon, 08/01/2011 - 20:30Hii
This is the free -m
total used free shared buffers cached
Mem: 4102 4069 32 0 4 39
-/+ buffers/cache: 4025 76
Swap: 2055 2038 17
Today it has remained fully utilised- swap and also sending the output of top
top - 16:15:45 up 130 days, 5:03, 2 users, load average: 12.20, 12.14, 13.94
Tasks: 115 total, 10 running, 105 sleeping, 0 stopped, 0 zombie
Cpu(s): 9.7%us, 0.4%sy, 0.0%ni, 89.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.1%st
Mem: 4201096k total, 4161232k used, 39864k free, 11604k buffers
Swap: 2104472k total, 2093824k used, 10648k free, 51360k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
10271 wwwrun 20 0 97740 28m 6052 R 40 0.7 0:02.64 osiris.cgi
10277 wwwrun 20 0 97376 24m 6296 R 40 0.6 0:02.06 osiris.cgi
10281 wwwrun 20 0 83064 12m 5284 R 40 0.3 0:01.30 osiris.cgi
5729 wwwrun 20 0 378m 273m 860 R 38 6.7 10:10.27 osiris.cgi
21345 wwwrun 20 0 941m 434m 328 R 38 10.6 40:34.26 osiris.cgi
30444 wwwrun 20 0 807m 430m 860 R 38 10.5 27:06.21 osiris.cgi
14356 wwwrun 20 0 926m 529m 324 D 36 12.9 45:46.06 osiris.cgi
10264 wwwrun 20 0 124m 57m 6204 R 32 1.4 0:04.60 osiris.cgi
12162 wwwrun 20 0 943m 480m 324 R 32 11.7 49:07.30 osiris.cgi
25712 wwwrun 20 0 924m 603m 964 R 32 14.7 34:36.30 osiris.cgi
28097 wwwrun 20 0 893m 525m 964 D 32 12.8 31:20.03 osiris.cgi
5578 wwwrun 20 0 92068 804 4 S 0 0.0 0:00.14 httpd2-prefork
6915 wwwrun 20 0 92952 3548 1620 S 0 0.1 0:00.14 httpd2-prefork
8131 wwwrun 20 0 94892 5752 1956 S 0 0.1 0:00.56 httpd2-prefork
8371 wwwrun 20 0 92364 3388 1932 S 0 0.1 0:00.36 httpd2-prefork
8644 wwwrun 20 0 92336 3404 1924 S 0 0.1 0:00.28 httpd2-prefork
8683 wwwrun 20 0 92348 3420 1940 S 0 0.1 0:00.34 httpd2-prefork
9093 wwwrun 20 0 94908 5676 1916 S 0 0.1 0:00.30 httpd2-prefork
9094 wwwrun 20 0 92840 3852 1908 S 0 0.1 0:00.26 httpd2-prefork
9352 wwwrun 20 0 92276 3248 1900 S 0 0.1 0:00.18 httpd2-prefork
9866 wwwrun 20 0 92688 3172 1848 S 0 0.1 0:00.08 httpd2-prefork
9982 wwwrun 20 0 92680 3548 1852 S 0 0.1 0:00.06 httpd2-prefork
10108 wwwrun 20 0 92068 2712 1620 S 0 0.1 0:00.00 httpd2-prefork
10121 wwwrun 20 0 92656 3292 1636 S 0 0.1 0:00.00 httpd2-prefork
10210 wwwrun 20 0 92068 2684 1632 S 0 0.1 0:00.00 httpd2-prefork
10268 wwwrun 20 0 97952 23m 5848 S 0 0.6 0:02.66 osiris.cgi
12322 wwwrun 20 0 92988 52 4 S 0 0.0 0:00.96 httpd2-prefork
14202 wwwrun 20 0 91924 56 4 S 0 0.0 0:00.02 httpd2-prefork
21059 wwwrun 20 0 91936 64 4 S 0 0.0 0:00.04 httpd2-prefork
24808 wwwrun 20 0 92364 84 4 S 0 0.0 0:00.20 httpd2-prefork
27685 wwwrun 20 0 94852 140 4 S 0 0.0 0:00.14 httpd2-prefork
30437 wwwrun 20 0 92068 652 4 S 0 0.0 0:00.00 httpd2-prefork
32242 wwwrun 20 0 92308 632 4 S 0 0.0 0:00.04 httpd2-prefork
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help to understand kernel logs: sshd invoked oom-killer:
ElectroMech — Tue, 08/02/2011 - 11:30Hi,
Swap: 2055 2038 17
Today it has remained fully utilised- swap and also sending the output of top
Please check the setting MaxSpareServers 10 is ok and you have restarted apache.
One more observation
There are some problem in osiris.cgi almost consuming all memory and processor through apache.
What is the process ? please check or let us have some information.
Thanks and Regards.
--
--
Nilesh Vaghela
(RHCSA RHCE)
ElectroMech Corporation
Redhat Channel Partner and Training Partner
404, Maulik arcade, Above Karnavati Pagarakha Bazar,
Nr. Mansi cross Road,
Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
www.electromech.info
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help to understand kernel logs: sshd invoked oom-killer:
Nirmal Pathak — Mon, 08/01/2011 - 14:30On 1 August 2011 13:52, Niyati Dave wrote:
> Hi all
>
> I am continuously facing the same logs and problem again. I want to try out
> increasing the swap. What I know is creating a swap file or a new swap
> partition. Is there any way to increase the present swap which is already of
> 2G.
> Waiting for resonse
>
If your existing swap filesystem is on LVM then you can extend the
Logical Volume.
If not, then you need to create a file or partition on the system and
create new swap space.
Check out this, http://www.thegeekstuff.com/2010/08/how-to-add-swap-space/
> Thanks wrote: wrote:
> Niyati
>
>
> On Mon, Aug 1, 2011 at 11:09 AM, Niyati Dave
>>
>> Hello all
>>
>> I have read the above discussion, so I would like to clarify a few
>> things.. the kernel is a latest one as provided by the suselinux enterprise
>> server and version 11 - so the latest one. The server is a xen guest and
>> applications running on the server is just apache, postfix. But yes it has a
>> good usage of apache application and there are few cron scripts related to
>> emailing, cgi. And as per the logs too after giving out of memory error
>> related to swap then oom-killer started killing sh, httpd-prefork, top, the
>> script.
>>
>> Thanks again
>> Niyati
>> On Mon, Aug 1, 2011 at 8:39 AM, ElectroMech
>> wrote:
>>>
>>> Hi,
>>>
>>> On Fri, Jul 29, 2011 at 5:49 PM, Niyati Dave
>>>>
>>>> Hello Sir,
>>>>
>>>> thanks for the response and explaination:
>>>>
>>>> 1 query I have the physical memory : 4102 M
>>>> and swap space : 2055 M
>>>> Is it recommended to increase the swap more?
>>>>
>>>
>>> Can you give us more idea what services are provided by server ?
>>>
>>> Mostly 4 G Memory is good, still depends on what application you served.
>>> Still we can change some parameters within application ( for memory
>>> utilization) so OOM-KILLER should not occurs.
>>>
>>>>
>>>> Thanks
>>>> Niyati
>>>
>>> Thanks and Regards.
>>> --
Have FuN!
--
Nirmal D Pathak.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What I want is freedom, not life, nor pleasure, nor good!
FOSS gives that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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help to understand kernel logs: sshd invoked oom-killer:
Nirmal Pathak — Fri, 07/29/2011 - 18:30Yes, as Alok mentioned in old days when Physical Memory was less & costly we used to put swap as double of Physical memory.
Now days we have huge physical memory on servers like 64GB, 128GB, etc there we do not require swap double of Physical Memory. Linux kernel hardly uses Swap space more than 20 GB, no matter how large Swap Space you keep on the servers.
It could be both! :)
As mentioned above when system is under heavy memory load, the kernel starts killing processes which are consuming high memory on the system.
Have FuN!
--
Nirmal D Pathak.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What I want is freedom, not life, nor pleasure, nor good!
FOSS gives that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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FOSS gives that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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help to understand kernel logs: sshd invoked oom-killer:
Alok Thaker — Fri, 07/29/2011 - 19:30Yes dear nirmal i.e very true..& she is using suselinux what I found is that there is a leakage somewhere, niyati are you doing some kind of scanning on webserver like PCI or Audit scan...that can cause memory to be consumed also....
Have FuN!
--
Nirmal D Pathak.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What I want is freedom, not life, nor pleasure, nor good!
FOSS gives that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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FOSS gives that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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help to understand kernel logs: sshd invoked oom-killer:
Alok Thaker — Fri, 07/29/2011 - 18:30Hi,
It is always recommended to have swap memory as twice of physical memory as per linux fundatmentals , in your case it looks it has less swap memory as compared to physical memory.
Thanks & Regards,
Alok
It could be both! :)
As mentioned above when system is under heavy memory load, the kernel starts killing processes which are consuming high memory on the system.
Have FuN!
--
Nirmal D Pathak.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
What I want is freedom, not life, nor pleasure, nor good!
FOSS gives that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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help to understand kernel logs: sshd invoked oom-killer:
Shakthi Kannan — Sat, 07/30/2011 - 00:30Hi,
--- On Fri, Jul 29, 2011 at 5:52 PM, Alok Thaker wrote:
| It is always recommended to have swap memory as twice of physical memory as
| per linux fundatmentals ,
\--
No. It was due to expensive RAM on the old architectures in the early
days. Linux memory management is quite proficient since 2.6, and this
false notion doesn't apply today. You can run GNU/Linux even without
any swap.
SK
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Shakthi Kannan
http://www.shakthimaan.com
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help to understand kernel logs: sshd invoked oom-killer:
Alok Thaker — Sat, 07/30/2011 - 00:30Hi,
Yes linux can be installed with or without swap but definiitely it impacts heavy applications like running big servers with big deployments of jboss,tomcat,apache,mod_jk,clustering things etc..definitely swap is helpful and here kernel version wasn't discussed but the problem of application leakage was discussed by niyati.
Thanks & Regards,
Alok
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help to understand kernel logs: sshd invoked oom-killer:
Shakthi Kannan — Sat, 07/30/2011 - 08:30Hi,
--- On Fri, Jul 29, 2011 at 11:33 PM, Alok Thaker wrote:
| and here kernel version wasn't discussed
\--
Linux is the kernel. You only gave (incorrect) information regarding
the Linux kernel which I quoted and replied. Now, you are saying
kernel version was not discussed. Read the replies, slowly, carefully
before replying.
=== QUOTED ===
On Fri, Jul 29, 2011 at 5:52 PM, Alok Thaker
wrote:
| It is always recommended to have swap memory as twice of physical memory
| as per linux fundatmentals ,
\--
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SK
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Shakthi Kannan
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