Re: WLM question : Is ziip service units counted in period switching

[shivang sharma]

Hi ,

So in our case we are dealing with a missing PI of DDF period 1 with 20 SU
and there does not seem to be an easy way to solve this problem when it
comes to correlating DB2 accounting data (101) with SMF 72. This is because
which DDF transactions ended in which period is not stored in DB2 101
records. There are few other questions which I would like to get your
insights on :

1)What does WLM consider as an ended transaction in case of DDF? A commit +
abort or the entire thread? There can be multiple commits per thread.


2)As per my understanding converting SU to CPU time is done using the WLM
SU/sec conversion factor. There is also a SRM su/sec published by IBM but i
think R723MADJ is used. This WLM factor can be different based on the
logical processor configuration of an LPAR. A DB2 data sharing member can
be on different CECs and LPARs so for example defining 20 SU will translate
to different amount of GCP time on different LPARs in a sysplex. Is my
understanding correct here ?

3)I am keen to understand what will happen in the scenario of sub capacity
processors where GCPs are slower than IIPs. Will WLM normalize the IIP
service units before deciding period aging?

Thanks
Ss







On Sat, Aug 31, 2024 at 4:20 PM Martin Packer 
wrote:

> If this weren’t the case Period Aging would work differently for (up to
> )60% of DDF transactions (the zIIP ones) versus (at least) 40% (the GCP
> ones). Indeed Period Aging wouldn’t work at all for the former (barring
> zIIP-on-GCP).
>
> Oh, not to confuse this with the newer High Performance DBAT support –
> which kills Period Aging for those DDF transactions.
>
> Cheers, Martin (coming back off vacation so late to the party)
>
> From: IBM Mainframe Discussion List  on behalf
> of Dave Barry <00a5644c6d08-dmarc-requ...@listserv.ua.edu>
> Date: Monday, 26 August 2024 at 17:05
> To: IBM-MAIN@LISTSERV.UA.EDU 
> Subject: Re: [EXTERNAL] WLM question : Is ziip service units counted in
> period switching
> "Duration is the amount of weighted SU (including zIIP) that a UOW (unit
> of work) may consume before it is switched to the goals of the next
> .period."
>
> Bear in mind that zIIP-eligible work can run on a GCP.
>
> -Original Message-
> From: IBM Mainframe Discussion List  On Behalf
> Of Dave Barry
> Sent: Monday, August 26, 2024 11:36 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: [EXTERNAL] WLM question : Is ziip service units counted in
> period switching O IBM-MAIN
>
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WLM question : Is ziip service units counted in period switching

[shivang sharma]

Hi ,

We have deined a multiperiod ddf workload service class with a duration of
20 service units in its 1st period.

I am wondering if wlm also uses ziip service units in period switching?

We have ioc mso coefficient = 0 and srb tcb = 1

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Is there a way to monitor numtcb ?

[shivang sharma]

Hi all ,

I am trying to find a way to monitor usage of numtcb for an application
environment. Is this information stored in SMF?

Thanks

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Need DFSORT control statements to extract data from smf15 with storclas blank

[shivang sharma]

Hi ,

I am not a DFSort expert but we have a requirement to extract datasets
which has storclas (SMF15SCN) = blank.

If someone has a ICETOOL code to do that please provide.

At this shop we do not have tools like SAS/MXG

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Re: Calculating SIIS% as MSUs or MIPS

[shivang sharma]

I will be using SAS MXG . I am fine with representing it in MSUs . But how
should i derive it. Will it be siis%
of the lpar total MSUs used in that interval?

On Fri, 5 May 2023 at 2:50 PM, Andreas von Imhof <
02ba5d449f94-dmarc-requ...@listserv.ua.edu> wrote:

> Using type 30's is not my 1st choice. Need to calculate capture ratio's,
> preferably by workload type. Cannot remember if DB2 type enclaves are
> captured here or it is all lumped into DB AS.
>
> I think that Shivang wants a total view. The document from John Burg
> spells it out quite clearly.
> eg page 4: z16 E170 / B2 * 100% I Writes sourced with L2 intervention / I
> Write
>
> I would take type 70's, match the intervals with the 113's and calculate
> the percentage.
> Never use MIPS, use HW or SW MSU (clearly state which one you are using).
> Why MSU? All contracts / pricing are based on this.
> MSU is also very easy to match to type 72's. Type 72's makes reporting
> easy peasy.
>
> Shivang, what tooling are you going to use to do this?
>
> Andreas von Imhof
> Capacity & Performance z/OS - zCAP
>
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Re: Calculating SIIS% as MSUs or MIPS

[shivang sharma]

I am not looking to know how to calculate siis% from smf113 . I am looking
for how to convert SIIS% in terms of MSUs or MIPS.

On Fri, 5 May 2023 at 2:33 PM, Martin Trübner <
047eec287bd9-dmarc-requ...@listserv.ua.edu> wrote:

> the May 2022 update has the numbers you are looking for
>
> Am 04.05.23 um 23:46 schrieb shivang sharma:
> > Hi ,
> >
> >
> > Every IBM document discribes this as % . I am trying to get the SIIS%
> value
> > in terms of MIPS or MSUs
> >
> > On Fri, 5 May 2023 at 1:49 AM, Sri h Kolusu  wrote:
> >
> >> Shivang,
> >>
> >> Check these links.
> >>
> >>
> >>
> https://www.ibm.com/support/pages/identifying-%E2%80%-instruction-stream%E2%80%9D-siis-inefficiency-using-cpu-mf-counters
> >> <
> https://www.ibm.com/support/pages/identifying-%E2%80%9Cstore-instruction-stream%E2%80%9D-siis-inefficiency-using-cpu-mf-counters
> >
> >
> >>
> >>
> https://www.ibm.com/support/pages/system/files/inline-files/CPUMF_Implementation_Details.pdf
> >>
> >> Thanks,
> >> Kolusu
> >>
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Re: Calculating SIIS% as MSUs or MIPS

[shivang sharma]

Hi ,


Every IBM document discribes this as % . I am trying to get the SIIS% value
in terms of MIPS or MSUs

On Fri, 5 May 2023 at 1:49 AM, Sri h Kolusu  wrote:

> Shivang,
>
> Check these links.
>
>
> https://www.ibm.com/support/pages/identifying-%E2%80%-instruction-stream%E2%80%9D-siis-inefficiency-using-cpu-mf-counters
> 


>
>
> https://www.ibm.com/support/pages/system/files/inline-files/CPUMF_Implementation_Details.pdf
>
> Thanks,
> Kolusu
>
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Calculating SIIS% as MSUs or MIPS

[shivang sharma]

Hi All ,

SMF113 provides metrics to calculate siis% . At one customer shop we have
been asked to provide estimated SIIS MSUs or MIPS . Can somebody point me
an easy way to derive this.

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SMF30_USERKEYCSAUSAGE Question

[shivang sharma]

While evaluating SMF 30 data for one customer found few address spaces
being reported with the  SMF30_USERKEYCSAUSAGE bit on. Below are few
examples :

1)INIT address spaces program IEFIIC (SMF30 subtype 4 step records)
2)DB2 MSTR , IRLM , DBM1 address spaces.
3)MSTJCL00 ad program IEEMB860.(SMF30 subtype 2,3)

I suspect somehow these address spaces are not being accurately reported
in the SMF 30 or I am missing something.

Anybody who can help in shedding some light on why these observations are
being reported with the SMF30_USERKEYCSAUSAGE bit on.

Thanks
Shivang

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Re: EXTERNAL EMAIL: Max possible velocity?

[shivang sharma]

You can draw lpar busy vs velocity of the service class to see what it
achieves when the lpar gets busy and get the number.


On Wed, 14 Oct 2020, 3:06 am Jerry Whitteridge, <
jerry.whitteri...@albertsons.com> wrote:

> Dave - I'm by no means a Capacity Planning guru but here's my 2 cents.
>
> Velocity is defined as a measure of protection against delay - it's not a
> hard and fast number. I'd first look at your service classes and find if
> any of them have a PI of less than 1. If they do they are over achieving
> their goals and you could drop the velocity on them to provide resources to
> the service classes who are struggling. Adjust the Velocities by 10 rather
> than single digits. All the tuning of the high achieving (not High
> Importance or velocity) Classes will provide help to the under achievers.
>
> Jerry Whitteridge
> jerry.whitteri...@albertsons.com
> Manager Mainframe Systems & HP Non-Stop
> Albertsons Companies
>
> -Original Message-
> From: IBM Mainframe Discussion List  On Behalf
> Of Gibney, Dave
> Sent: Tuesday, October 13, 2020 2:28 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: EXTERNAL EMAIL: Max possible velocity?
>
> It has been quite some time since I had to worry about my WLM policy.
> We've had ample capacity since 2007. Now, as We begin to wind down, we have
> reduced our contracted MSU capacity.
> We dropped from 15 to 12 on an 5 way z13S-N05. My WLM policy, last
> seriously adjusted in 2007 when we moved to a z9-L03 has velocities ranging
> from a high of 90 (Adabas, Imp 1)   down to 5 (BATCH Imp 5)
> We are experiencing just a minor amount of performance pain. It strikes me
> that perhaps some of my higher velocity goals (90, 70, 60, 50) may be
> unattainable under the now reduced capacity.
>
> What is the high end for possible, single threaded (Adabas) velocity here?
> Or, where should I be reading in current manuals. I was better at this 15
> years ago.
>
> Dave Gibney
> Information Technology Services
> Washington State University
>
>
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Re: Reverse map Adsadmp parms

[Shivang Sharma]

Hi Jim , 

One additional question . What about AMDSACCT . I see some parms there as well 
. Will it be line 1?

Thanks 
Shivang Sharma

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Re: VIO dataset problem

[Shivang Sharma]

Hi, 

My dataset is less the max limit . VIO has support for BDAM as well.
Not sure on what is left to check?

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Re: VIO dataset problem

[Shivang Sharma]

Hi , 

We are not storage constraint . We hardly page .The idea behind using VIO is to 
reduce hard I/O for BDAM . When you say the file size is excessive is there a 
limit ? Job is not looping that's for sure . 

Thanks 

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VIO dataset problem

[Shivang Sharma]

Hi everybody,

I am facing an unusual problem with VIO datasets.
I submit 5 instances of the same job within a span of 5 minutes.
Out of them 3 shows VIO being paged out . The other runs seems to 
be fine . Not able to understand what can be causing this?

Thanks in advance.

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Re: Reverse map Adsadmp parms

[Shivang Sharma]

Thanx Jim , that was beneficial.
One additional question, I can see
the PL/s structure defined in
Amdsaddo which has pointers to
different sections for example
a pointer to console options.
So how we can convert these pointers 
in terms of character position (offset)
to identify the start of each section.

Thanks in advance.

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Reverse map Adsadmp parms

[Shivang Sharma]

Hi all,

Is there a way to reverse engineer 
the AMDSADMP parms used to create 
the dump program from the
Sys1.pagedump dataset

Thanks.
Shivang Sharma

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