RE: Grid agent and CPU
Date: Sat, 24 Jun 2017 12:25:27 +0000
Message-ID: <30952_1498307133_594E5A3D_30952_5382_1_ECDEF0CC6716EC4596FCBC871F48292AB189C75E_at_ZRH-S231>
It is because of its architecture. What I mean by that is the Agent process permanently fires probes which are implemented as independent Perl and Java programs.
Just take a look at the truss -c -f output for an Oracle Cloud Control Agent process:
function time(s) count
lwp_park 22.465 173347
lwp_unpark 2.805 93786
...
...
forkx 87.612 1311
yield 11.617 190621
lwp_suspend 140.853 1115963
lwp_continue 8.329 1117835
...
- ------
sys totals: 304.582 3277516
usr time: 215.874
elapsed: 2106.830
In the example above, 15% of the elapsed time is the OS kernel CPU time spent just on thread management and forking!
Nenad Noveljic
Twitter: _at_NenadNoveljic
Home page: http://nenadnoveljic.com/blog
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Orlando L
Sent: Samstag, 24. Juni 2017 11:17
To: oracle-l_at_freelists.org
Subject: Grid agent and CPU
Hi,
We had some prod servers with grid/cloud agents installed, but realized that they were a significant Cpu hog in that they were consuming 20-30% of the cycles in some AIX LPARs with 4-8 cores consistently. I am talking non stop for hours, days and weeks. Talking to support did not help us much except 'apply a patch' which did not help.
After lots of internet search, it looks like this seems to be an issue with several tools and specifically grid agent. Do the listers plan for a certain amount of CPU during architecture phase for monitoring tools when they carve out db servers.
TIA, Orlando.
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