RE: How are CPU Speed and Overall CPW Related?

[Chris Bipes <chris.bipes@xxxxxxxxxxxxxxx>]

Get the time slice and run priorities of each job on each machine.  Also
check the memory pool the job is running in on each machine and see if there
is any non-data paging.  Also check for the levels of the OS.  4.5 runs
faster than 4.4 which is faster than 4.3 ....  Also, did Ken fully optimize
his program and you did not?  These are all factors that effect performance.

Christopher K. Bipes    mailto:ChrisB@Cross-Check.com
Operation & Network Mgr mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.        http://www.cross-check.com
6119 State Farm Drive   Phone: 707 586-0551 x 1102
Rohnert Park CA  94928  Fax: 707 586-1884



-----Original Message-----
From: Nathan M. Andelin [mailto:nathanma@haaga.com]
Sent: Tuesday, May 01, 2001 11:53 AM
To: MIDRANGE-L@midrange.com
Subject: Re: How are CPU Speed and Overall CPW Related?


It's great to get a response from you, Alexei.  I think we all appreciate
your insider insight.  I won't bother adding more memory now, because at
this point I'm interested in raw CPU speed.

I'm aware that CPW is a measure pertaining to a mixed workload under load
testing and is affected by overall system design, but I still question
AS/400 CPU performance.

I wondered about a CPU governor for several reasons.  The program we were
benchmarking was entirely CPU bound.  The program simply repeated a few
String functions, in memory, maybe 100,000 times within an RPG do while
loop.  Both machines had about the same RAM.  Neither had L2 Cache.  I'm
talking about a model 170-2160 and a model 170-2290.  Yet the 100 Mhz
machine executed the code faster than the 200 Mhz machine.  If I were
running the same logic on a pair of Intel boxes, identical in every way
except Mhz, then I'm fairly certain the higher Mhz machine would be faster.

What makes the AS/400 CPU different, in this limited scenario?

Thanks,

Nathan.
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