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Subject: Ganglia-general Digest, Vol 75, Issue 6
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1. calculate cpu utilization with cpu time (crayon z)
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Message: 1
Date: Fri, 10 Aug 2012 17:00:36 +0800
From: crayon z <crayon....@gmail.com>
Subject: [Ganglia-general] calculate cpu utilization with cpu time
To: ganglia-general@lists.sourceforge.net
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<CAF+Druhxf8R_o1y3kAEJ7etY=1c0uv1q0jrbhyptvr-alnz...@mail.gmail.com>
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Hi, all:
I use ganglia to parse metrics from Host sFlow. The cpu metrics in
Host sFlow are in form of CPU time, however, I want to know how ganglia
calculate cpu utilization with cpu time.
Best Regards
--
Crayon Z
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Hi Crayon
>From a python module (there is similar code in procstat.py):
# clock ticks per second... jiffies (HZ)
JIFFIES_PER_SEC = os.sysconf('SC_CLK_TCK')
cpu_time = time.time()
proc_time = float(stat[2]) / JIFFIES_PER_SEC
if not proc in last_val:
last_val[proc] = {}
# do we have an old value to calculate with?
if 'cpu_time' in last_val[proc]:
mymetrics[proc]['cpu'] = (100.0 * float(proc_time -
last_val[proc]['proc_time'])) / float(cpu_time - last_val[proc]['cpu_time'])
stat[2] contains the number of jiffies executed by the process
so divide the number of jiffies executed by the length of the time period and
multiply by 100.0 and by JIFFIES_PER_SEC
Regards
--
Paul Hewlett X25250
http://www.theregister.co.uk/2012/06/25/rbs_natwest_what_went_wrong/
ARM Ltd
110 Fulbourn Road, Cambridge, CB1 9NJ
Tel: +44 (0)1223 405923
skype: paul-at-arm
www.arm.com
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