Sharpe, Sam J wrote:
> On Tue, 2008-02-19 at 01:52 +0900, John Summerfield wrote:

>> Seriously, how long to run eight of them at once?
>>
>> The number of CPUs and cores is irrelevant unless you're running
>> multiple threads/processes.
>>
>> I would speculate that F8 and opensuse 10.2 have newer gcc and that that
>> makes a significant difference.
>
> I think the issue was:
> Fast: ( big hardware + (opensuse 10.2 or Fedora 8)) OR (slow hardware +
> older RHEL4)
> Slow: ( big hardware + (RHEL5 or latest RHEL4))
>
> Note that (Slow Hardware + older RHEL4) beats (fast hardware + latest
> RHEL4) - the other comparisons aren't interesting.

See my previous note. The number of cores/CPUs is irrelevant, and we
don't know the capabilities of the individual processors.

Running eight together will show the benefit of the additional CPUs and
cores.

>
> I'm not into reading C, so I have no idea what the test case attempts to
> do, however:

My quick impression is that it's a benchmark of a kind intended to
exercise some aspects of the CPUs capabilities.

Changing compiler _and_ CPU doesn't give a valid measurement of the
CPUs, though it _is_ a valid measurement of the benefits of changing the
hardware and software platform, both.

>
> Monitoring Top output:
>
> A RHEL5 64 bit machine, uses 100% of a single processor
> A F8 32 bit machine, uses 100% of a processor, split across both
> processors.
The first is better scheduling, but that's entirely as I expected - it
uses one core only.
>
> - does 32 bit code or Fedora 8 enable parallelism that does not work on
> 64 bit code and or RHEL5?
No. Switching processors probably impairs performance.

>
> Monitoring Memory usage:
> RHEL5: 16% of 1GB = 150MB
> F8: 4% of 4GB = 150MB
>
> - therefore I don't think amount of memory in the box makes a
> difference.
>
> Pedro: What is the output of `rpm -qif /usr/include/math.h` on each of
> those machines?
>
> --
> Sam
>
> _______________________________________________
> rhelv5-list mailing list
> rhelv5-list@(protected)
> https://www.redhat.com/mailman/listinfo/rhelv5-list
>


--

Cheers
John

-- spambait
1aaaaaaa@(protected)
-- Advice
http://webfoot.com/advice/email.top.php
http://www.catb.org/~esr/faqs/smart-questions.html
http://support.microsoft.com/kb/555375

You cannot reply off-list:-)

_______________________________________________
rhelv5-list mailing list
rhelv5-list@(protected)
https://www.redhat.com/mailman/listinfo/rhelv5-list