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: @NenadNoveljic
Home page: http://nenadnoveljic.com/blog
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Orlando L
Sent: Samstag, 24. Juni 2017 11:17
To: oracle-l@xxxxxxxxxxxxx
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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