cmclconfd takes more than 90% CPU at specific times

[Sajith V Mannadiar]

Hello there,

We have noticed that at specific times, between 02:08AM to 02:24 AM [GMT], cmclconfd daemon occupies almost 90% of one CPU (SYS_CPU_UTIL)

It is impacting the performance of our batch jobs that runs during that time.

We have checked on 3 different servers on the same cluster and it is the same on all.

Any thoughts on why this could happen?

Please help

Thanks,
Sajith

[Robert-Jan Goossens · Accepted solution]

Hi Sajith,

Check this doc.

Title: cmclconfd consumes a lot of CPU time
Document ID: UMCSGKBRC00014425

US
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000079976289

Europe
http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000079976289

Regards,
Robert-Jan

[Chan 007]

Saj,

Try reduce the dbc_max_pct. What is your current value, have you set as def to 50. Then make it 20 or so.

We have huge SAP instance, and I have set to 10, it works fine now.

Chan

[Steven E. Protter]

Shalom Sajith,

Perhaps a kmtune outpout would be helpful.

It may be kernel tuning time.

SEP

[Sajith V Mannadiar]

Hi Robert-Jan,

I could not get the document mentioned in that technnote,

UMCSGKBRC00014697
Title: Tracing the source of cmgetconf commands

Can you please send me the URL for this one too?

I still do not understand why cmclconfd should take almost 90% of system CPU on all cluster nodes, that too only between 02:08 to 02:24. This time varies everyday.

Attached is the excerpt from measureware stats

Please help

Thanks,
Sajith

[Chan 007]

Saj,

This guess you may need a patch.

Check this link

http://www1.itrc.hp.com/service/cki/patchDocDisplay.do?patchId=PHSS_27158

This talks about similar terms

Chan

[Robert-Jan Goossens]

Hi,

Title: Tracing the source of cmgetconf commands
Document ID: UMCSGKBRC00014697

US
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000080361310

Europe
http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000080361310

Regards,
Robert-Jan

[Chan 007]

Saj,

The link i send you just 2 mins before, even I was taken a back, on reading this info..

Hope this may be your case too...!!


2. When cmcld is running with more than ten network
interface cards configured on a cluster node, its
CPU utilization percentage raises significantly.
This problem is mostly exposed with Superdome machines,
or systems with large VLAN configuration.