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When is VSCORE used in Syncsort

 
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chandramouliravi

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Joined: 27 Apr 2009
Posts: 26
Location: addison

PostPosted: Sat Dec 05, 2009 2:06 pm    Post subject: When is VSCORE used in Syncsort
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Hi,

I saw the topic on VSCORE and VSCORET. Could you please clarify below questions on that.

1) When we have below code in MAXSORT. Does these WORK datasets use space declared by VSCORE and VSCORET?
Code:
//SORTWK01 DD SPACE=(CYL,(&SRTSPC)),DSN=&&TEMP1,
//                       DISP=(NEW,PASS)
//SORTWK02 DD SPACE=(CYL,(&SRTSPC)),DSN=&&TEMP2,
//                       DISP=(NEW,PASS)
//SORTWK03 DD SPACE=(CYL,(&SRTSPC)),DSN=&&TEMP3,
//                       DISP=(NEW,PASS)


2) In Sort, Is Region parameter space considered before using VSCORE specified space?

3) Maxsort uses disk space first and then tape space for sorting.
Does disk space mean space specified in VSCORET?

4) When ever we say SORT uses temporary memory during Sorting, does
it refer to "virtual storage below the 16-megabyte line"?
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Anuj Dhawan

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Joined: 22 Apr 2006
Posts: 6258
Location: Mumbai, India

PostPosted: Mon Dec 07, 2009 4:18 pm    Post subject:
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Quote:
When is VSCORE used in Syncsort

The VSCORE option allows you to set the maximum amount of virtual storage below the 16-megabyte line that SyncSort can use for its working set.

The VSCORET option allows you to set the maximum amount of virtual storage below AND above the 16-megabyte line that SyncSort can use for its working set when SyncSort’s Dynamic Storage Management (DSM) facility is inactive.

When DSM is active, VSCORET is treated as an initial recommendation. The VSCORET value cannot be less than the value set in the VSCORE option.
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Bill Dennis

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Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA

PostPosted: Mon Dec 07, 2009 10:05 pm    Post subject:
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REGION, VSCORE and VSCORET all refer to internal memory storage working space. The SORTWKxx files use external storage based on the SPACE parameter provided.

When sorting,
- internal memory is used first, in case the file is small
- SORTWKxx space is used when internal memory is insufficient
- tape is used for intermediate file storage on MAXSORT when SORTWKxx is insufficient
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chandramouliravi

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Joined: 27 Apr 2009
Posts: 26
Location: addison

PostPosted: Wed Dec 16, 2009 12:19 pm    Post subject:
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Hi Dennis,

Thanks for the clarification. Sorry for my late reply.
I am searching the forum for other discussion on these parms to ask right questions. I am using SYNCSORT 1.3.0.2R

How do we calculate what is the Optimal value we can give for VSCORE and VSCORET?

How much internal storage is available. Is it above 16M or below 16M? This may be vary as i guess.

I saw that all REGION, VSCORE, VSCORET refer to internal memmory.
I wonder why do we need VSCORE and VSCORET separately.
Why dont we have single parameter like VSCORE, where we can say what is the value we want?


How does CORE=MAX differ from VSCORE and VSCORET? Does any parm has priority over other?

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