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  3. April 2018

Re: Memory pool , object question

Paul,

Once the program is called it's in memory so the test is not valid. All you are testing is I/O, not memory usage. Pinning the program in memory is almost completely worthless in theses tests

Jim Oberholtzer
Agile Technology Architects



On Apr 7, 2018, at 3:01 PM, Steinmetz, Paul <PSteinmetz@xxxxxxxxxx> wrote:

Completed the next test.
Chain using record number, starting with last record, 400,000,000, ending with the first record, 1.

90 minutes.

With SETOBJACC
SETOBJACC OBJ(PAULS/CCEKCPP) OBJTYPE(*FILE) POOL(*SHRPOOL1)
46877104K of CCEKCPP brought to pool with 10732K unused.
72 minutes, savings of 18 minutes.

I expected a larger savings.
This was on a Production LPAR, somewhat idle.
Any thoughts from the group?

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Friday, April 06, 2018 5:57 PM
To: Midrange Systems Technical Discussion
Subject: Re: Memory pool , object question

An even that's probably not really a valid test...

Likely that many of the blocks will remain in memory...unless you're testing on a box with a production workload so that data is likly to be paged out...

Charles



On Fri, Apr 6, 2018 at 1:53 PM, Steinmetz, Paul <PSteinmetz@xxxxxxxxxx>
wrote:

Charles,

That is my next test, work in progress.
RPGLE.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Charles Wilt
Sent: Friday, April 06, 2018 3:50 PM
To: Midrange Systems Technical Discussion
Subject: Re: Memory pool , object question

Not really a valid test...

Assuming RPG RLA with an input file...RPG will buffer data..

If using SQL, the Db will asynchronously bring in the data...


Change your program to do 400M random reads.

Charles



On Fri, Apr 6, 2018 at 1:32 PM, Steinmetz, Paul
<PSteinmetz@xxxxxxxxxx>
wrote:

Jim,

Do you have any time savings of your use of SETOBJACC?

I created a 400,000,000 record test file.
Created a simple test program, read the file, beginning to end.
14 minutes to read all 400,000,000 million records.

SETOBJACC OBJ(PAULS/CCEKCPP) OBJTYPE(*FILE) POOL(*SHRPOOL1)
46877104K of CCEKCPP brought to pool with 25441484K unused.

Reran the same test program.
11 minutes to read 400,000,000 million records.

SETOBJACC OBJ(PAULS/CCEKCPP) OBJTYPE(*FILE) POOL(*PURGE) Member
CCEKCPP purged from main storage.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf
Of Jim Oberholtzer
Sent: Friday, April 06, 2018 1:59 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Memory pool , object question

SETOBJACC has some limitations as well.

IF the object is truly read only such as a program or data area it
will stay
in memory. But if the object is updated, such as a file or data queue,
then the system will force it to DASD at some point and it will fall
out of that pinned memory.

I will always use a shared pool like *SHRPOOL60 and start working
back from there since those are really rarely used. No work in
those pools except the objects that are pinned in there.



-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf
Of Vernon Hamberg
Sent: Friday, April 06, 2018 12:51 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Memory pool , object question

Paul

I would not put anything into *BASE using SETOBJACC - the article I
cited says these should go into a pool where there is no work, a
fixed pool, that will not be affected by any optimization - you want it static.

It is not just data that is paged in and out of a pool - it is also
*PGM objects - and potentially almost anything else jobs work with.
*BASE would be the place where almost everything will get paged out
of main memory eventually and maybe not before too long a time.

Also be sure not to over-manage this stuff - see that article,
again, for what makes good candidates for this technique.

Cheers
Vern

On 4/6/2018 10:18 AM, Steinmetz, Paul wrote:
-snip-
I feel I can improve the performance of some long running batch jobs.
Some
of these run multiple times per day.
What's the solution?
SETOBJACC, Keep in memory (KEEPINMEM), combination of both.

I'm considering the use of SETOBJACC, especially once the P9
arrives with
ample memory.
SETOBJACC needs to point to a storage pool.
The objects being considered for SETOBJACC might be used by both
interactive (*INTERACTIVE) and batch (*SHRPOOL1) My thoughts were
run
everything out of *BASE, SETOBJACC would point to *BASE.
-snip-
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