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Strobe : XMEMORY : CROSS MEMORY

 
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manoopatil

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Joined: 07 Dec 2003
Posts: 56
Location: Montreal

PostPosted: Tue Oct 28, 2008 10:30 pm    Post subject: Strobe : XMEMORY : CROSS MEMORY
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Hi,

I ran STROBE to analyze the performance for one of the program. It is showing that 25% of CPU is caused due to XMEMORY. Can anyone help what is the reason for the high CPU consumption for Cross Memory. And how it can be optimized.

1STROBE* PERFORMANCE PROFILE TBR6150 10/27/2008 PAGE 8
- ** PROGRAM SECTION USAGE SUMMARY **
- MODULE SECTION 16M SECT FUNCTION % CPU TIME CPU TIME HISTOGRAM MARGIN OF ERROR: .90%
NAME NAME <,> SIZE SOLO TOTAL .00 16.00 32.00 48.00 64.00

.SYSTEM .COBLIB COBOL LIBRARY SUBROUTINE .03 .03 .
.SYSTEM .COMMON COMMON AREA 3.32 3.35 .**
.SYSTEM .DB2 DB2 SYSTEM SERVICES 62.55 62.63 .***************************************
.SYSTEM .IOCS DATA MANAGEMENT SERVICES .03 .03 .
.SYSTEM .IRLM RESOURCE LOCK MANAGER .55 .55 .
.SYSTEM .MEDIAMG MEDIA MANAGER MODULES .08 .08 .
.SYSTEM .NUCLEUS MVS NUCLEUS 1.56 1.56 .
.SYSTEM .STROBE STROBE CAPTURE PROCESS 1.55 1.55 .
.SYSTEM .SVC SUPERVISOR CONTROL .05 .05 .
.SYSTEM .XES X-SYS EXTENDED SERVICES .06 .06 .
.SYSTEM .XMEMORY CROSS MEMORY 24.44 24.48 .***************
----- -----
.SYSTEM TOTALS SYSTEM SERVICES 94.22 94.37

NSK606 > 38384 .84 .84 .
SSASQLIB > 3120 4.79 4.79 .**
----- -----
PROGRAM IKJEFT01 TOTALS 99.85 100.00
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8165
Location: East Dubuque, Illinois, USA

PostPosted: Tue Oct 28, 2008 10:44 pm    Post subject:
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A short Google search found
Quote:
In z/OS, a user can access another user's address spaces directly through cross-memory services.
If there's a DB2 address space, I suspect the XMS (Cross Memory Services) is being used transferring data between your program and DB2 (and vice versa).
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