Joined: 24 Aug 2005 Posts: 32 Topics: 14 Location: Hyderabad
Posted: Thu Sep 14, 2006 6:39 am Post subject: Can anybody explain 'CORE=MAX,VSCORET=16M'
Hi All,
I heard that by adding the code PARM='CORE=MAX,VSCORET=16M', to a SORT step the performance will get improved drastically. Do anybody know about how it works, if so please explain.
Joined: 26 Nov 2002 Posts: 12367 Topics: 75 Location: San Jose
Posted: Thu Sep 14, 2006 7:24 am Post subject:
Sharada,
Check this
Code:
CORE is used to override the installation default for the amount of memory the sort/merge is allowed to use. To specify an amount of memory, choose one entry from each pair of braces.
Note that CORE and SIZE are synonymous. Note also that memory specification may be a decimal number of bytes (CORE=n), a decimal multiple of K, where K=1024 bytes (CORE=nK), or a decimal multiple of M, where M=1048576 bytes
(CORE=nM).
For simplicity, the following describes only CORE, specified in units of nK.
CORE=nK Defines a maximum memory limit of nK below the
16-megabyte line.
CORE=MAX Assigns to the sort/merge all the available
memory above and below the 16-megabyte line.
CORE=MAX-nK Assigns to the sort/merge all the available
memory above and below the 16-megabyte line
less nK bytes, which is reserved below the
16-megabtye line.
Consult your systems staff for any installation-specific modifications to the handling of CORE. For example, "CORE" will be limited if a maximum memory size for SyncSort was set at installation time.
Hope this helps...
Cheers
Kolusu _________________ Kolusu - DFSORT Development Team (IBM)
DFSORT is on the Web at:
www.ibm.com/storage/dfsort
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