ca.portal.admin

Re:CPU Effectiveness

Discussion created by ca.portal.admin on May 16, 2005
Hi,



Now that we have updated our Production system to 16.0 SP1 + apars on
z/OS 1.4 and it has the nifty DCMT D SUBTASK EFFECTIVENESS command, what
is a good value for this at the end of the day? Currently we are at 77%
after 5 hours and slowly going up.



Thanks



Chris Wood

Alberta Department of Energy

CANADA

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Normal

Normal
Re: CPU Effectiveness
"I'm receiving this:

*** Subtask display ***
Subtask % CPU
Name Elapsed time Total CPU time effectiveness
-------- -------------- -------------- -------------
00:00:00.0000 00:00:00.0040 N/A

Why there is not information with the command ???

TIA

J. Sotela
From: ""Wood, Chris"" <Chris.Wood@GOV.AB.CA>
Reply-To: IDMS Public Discussion Forum <IDMS-L@LISTSERV.IUASSN.COM>
To: IDMS-L@LISTSERV.IUASSN.COM
Subject: Re: CPU Effectiveness
Date: Tue, 17 May 2005 09:18:32 -0600

We managed 79% by the end of the day.

I was looking at the 16.0 SP1 System Tasks and Operator commands manual
about DCMT D SUBTASK in section 3.53. The DCMT D SUBTASK subtasknum
gives lots of information but the manual does not describe all the
output. It would be nice to know what all of the line mean and which
ones can be tuned to improve performance. Is this changed for SP2?

Thanks

Chris

-----Original Message-----
From: IDMS Public Discussion Forum [mailTo:IDMS-L@LISTSERV.IUASSN.COM]
On Behalf Of Jim Criscuolo
Sent: May 16, 2005 11:55 AM
To: IDMS-L@LISTSERV.IUASSN.COM
Subject: Re: CPU Effectiveness

Chris,

I remember hearing that 90% would be a good number. I think John Siraco
told us that at one of the IUA sessions in Tampa.

Jim Criscuolo

-----Original Message-----
From: IDMS Public Discussion Forum [mailTo:IDMS-L@LISTSERV.IUASSN.COM]On
Behalf Of Wood, Chris
Sent: Monday, May 16, 2005 1:05 PM
To: IDMS-L@LISTSERV.IUASSN.COM
Subject: CPU Effectiveness


Hi,



Now that we have updated our Production system to 16.0 SP1 + apars on
z/OS 1.4 and it has the nifty DCMT D SUBTASK EFFECTIVENESS command, what
is a good value for this at the end of the day? Currently we are at 77%
after 5 hours and slowly going up.



Thanks



Chris Wood

Alberta Department of Energy

CANADA

This communication is intended for the use of the recipient to which it
is
addressed, and may contain confidential, personal and or privileged
information. Please contact us immediately if you are not the intended
recipients of this communication, and do not copy, distribute, or take
action relying on it. Any communication received in error, or subsequent
reply, should be deleted or destroyed.
This communication is intended for the use of the recipient to which it is
addressed, and may contain confidential, personal and or privileged
information. Please contact us immediately if you are not the intended
recipients of this communication, and do not copy, distribute, or take
action relying on it. Any communication received in error, or subsequent
reply, should be deleted or destroyed.
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Normal

Normal
Re: CPU Effectiveness
"Hi Chris,
CPU Effectiveness represents the amount of CPU time an IDMS CV needed
vs. the amount of CPU time it actually received. The number should be as
close to 100 percent as possible. Then again, a CPU Effectiveness value
of 20 percent could also be considered acceptable if you are happy with
performance and meeting service level agreements.

The value is derived as follows:

When the IDMS system is dispatched by the operating system one of the
very first things we do is issue a STCK instruction. This represents the
time we were dispatched. When IDMS has finished all it's processing we
again issue a STCK instruction. This gives us our ending time. The
difference between the two is the amount of time the IDMS system was
dispatched.

Between the two STCKs above, the IDMS system is calculating the amount
of CPU time it is actually getting using operating systems related
timing functions. While the IDMS system is up and dispatched it can be
interrupted due to Paging, Swapping, or Higher priority work. If such an
interruption occurs the CPUTIME used during this interrupt is not
attributed to IDMS.

Example:
Assume the IDMS system is dispatched at STCK time 0 and goes to sleep at
STCK time 10. During these 10 seconds another application running at a
higher priority is dispatched. Because this other application is running
at a higher priority the CPU is taken from the IDMS system. This other
application runs for 3 seconds then gives up control. The IDMS system
which had been interrupted is then allowed to continue.

IDMS was dispatched for 10 seconds. Higher priority work interrupted for
3 seconds. The CPU effectiveness is 70 percent.

Please feel free to give me a call at 508-628-8247

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