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Re: shmget ENOSPC Informix 11.70FC7 on Ubuntu 64 b

Posted By: JAN-PETER SEIFERT
Date: Thursday, 15 May 2014, at 10:52 a.m.

In Response To: Re: shmget ENOSPC Informix 11.70FC7 on Ubuntu 64 b (JON RITSON)

Hello,

thank you very much for your fast reply!

> Have a look at onstat -g seg and ipcs -ma.

> A starting point would be to see what all the "V"'s add up to from onstat -g seg and set SHMVIRTSIZE to that.

Currently those are set in the onconfig file to:
SHMVIRTSIZE 262144
SHMADD 32768

onstat -g seg shows 95 virtual segments that have been added:
-----------------------------------------------------------------------------
IBM Informix Dynamic Server Version 11.70.FC7 -- On-Line -- Up 21:53:00 -- 4042644 Kbytes

Segment Summary:
id key addr size ovhd class blkused blkfree
0 52564801 44000000 682450944 8430968 R 166613 1
32769 52564802 6cad6000 268435456 3147384 V 64909 627
65538 52564803 7cad6000 1110016 14328 M 270 1
98307 52564804 7cbe5000 33554432 394728 V 8192 0
131076 52564805 7ebe5000 33554432 394728 V 8192 0
.
.
.
3113055 52564860 134be5000 33554432 394728 V 8192 0
3145824 52564861 136be5000 33554432 394728 V 8191 1
3178593 52564862 138be5000 33554432 394728 V 543 7649
Total: - - 4139667456 - - 1002373 8288
-----------------------------------------------------------------------------
Should I really set SHMVIRTSIZE to 3375104 then?

I wonder what is adding so much virtual segments automatically around 3 PM after each server restart. Today they have been added from 14:56:36 until 14:59:58.

According to OAT these tasks could be responsible:
----------------------------------------------------------------------
mon_users 3672 0.02 100.22 2014-05-15 14:56:32 Success
mon_low_storage 14557 0.00 23.09 2014-05-15 14:56:32 Success
check_backup 616 0.02 16.69 2014-05-15 14:56:32 Success
Alert Cleanup 616 0.03 22.75 2014-05-15 14:56:32 Success
Job Results Cleanup 616 0.01 7.41 2014-05-15 14:56:32 Success
mon_memory_system 7336 0.01 94.41 2014-05-15 14:56:34 Success
mon_checkpoint 14660 0.01 219.92 2014-05-15 14:56:34 Success
mon_table_profile 1229 1.49 1833.08 2014-05-15 14:56:34 Success
mon_profile 3672 0.01 61.38 2014-05-15 14:56:34 Success
mon_command_history 616 0.00 1.29 2014-05-15 14:56:34 Success
mon_vps 3672 0.00 22.42 2014-05-15 14:56:34 Success
mon_table_names 616 32.60 20083.29 2014-05-15 14:57:28 Success
Low Memory Reconfig 14660 0.00 72.84 2014-05-15 15:03:25 Success
----------------------------------------------------------------------

I guess it must be 'Low Memory Reconfig', but then 'Last Run Time' means the last time the task has been finished running?

> 2. The error was ENOSPC - I would suggest you look swap configuration.

> How much swap is allocated to this host?

swapon -s:
Filename Type Size Used Priority
/dev/sda1 partition 7811068 188 -1

> What is "RESIDENT" set to in the $ONCONFIG?
RESIDENT 0

I'll have a look whether Ubuntu supports forcing residency.

> Have you really configured this instance to "work within resources that are available"?

I guess not really, because of the error. After the problem appeared the first time I set SHMTOTAL to a fixed value and it didn't help. So it's currently back at 0. I guess it was set too low. The current official system requirements aren't that high though:
http://www-01.ibm.com/support/docview.wss?rs=630&uid=swg27013343

> 3. http://www.linuxquestions.org/questions/linux-newbie-8/shmmax-in-ubuntu-860206/ ... SHMMAX is probably the kernel parameter you are looking for.

It's currently set to 4187361280 - but considering that Informix is using 4042644 Kbytes according to 'onstat -' already 6281041920 might be better?

Thank you very much!

Best regards,

Peter Seifert

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