[CentOS] Load Average
peter at farrows.org
Wed Mar 1 23:26:13 UTC 2006
That works out at a load average of about 18 per cpu, which is of course
workable as you point out, however stuff like sendmail would bulk when
it reaches 12.
Lamar Owen wrote:
> On Wednesday 01 March 2006 13:45, Peter Farrow wrote:
>> You need to check out whether the system is waiting on IO, on the
>> version of top on Centos 4.2 it doesn't show IO wait on the display, but
>> on the RH enterprise shipping version it does.
>> A load average of 9 is getting high, you expect would services like
>> sendmail to stop listening once the system load average gets to 12.
> As a data point, on my Sun E6500 during load testing a few months back, under
> Aurora SPARC Linux (I would expect similar performance from CentOS SPARC) I
> was pulling a load average of 250+ with little interactive degradation
> (command line mode). The E6500 had 14 CPU's and 16GB of RAM at the time, and
> was serving an ab load (apache bench) of 256 concurrent requests to a Koha
> integrated library system backend, over a total of 2.5 million requests.
> Every page hit the database at least twice, from Perl. System at that load
> average was serving 6 pages per second; at a concurrency of 1, system served
> 4 pages per second, so performance increased as load did. I would have hit
> it with more concurrency, but httpd was compiled with a 256 connection max
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