Ken Williams wrote: > I've got a module IAXVP eating 25% of the CPU of some of my busiest CICS > regions - CICS 3.1, zOS 1.8 Its to do with real storage management. And > these aren't the biggest real storage eaters in CICS . I don't have any > real storage problems, and ive got 32 gb on the machine > > Anyone got any suggestions as to what might cause this or what to look > at? > Does this fit?
APAR Identifier ...... OA24094 <https://www-304.ibm.com/jct03004c/ibmlink/sis/viewAparDoc.wss?context=aparAndUsage&documentIds=OA24094&lc=en&cc=US> Last Changed ........ 08/05/05 IN A CICS TRANSACTION ISOLATION ENVIRONMENT (IE. USING SUBSPACES) HIGH PERFORMANCE OVERHEAD IN IAXVP DOING CSP Symptom ...... PR PERFM Status ........... OPEN Severity ................... 2 Date Closed ......... Component .......... 5752SC1CR Duplicate of ........ Reported Release ......... 730 Fixed Release ............ Component Name 5752 REAL STOR Special Notice Current Target Date ..08/05/23 Flags SCP ................... Platform ............ Status Detail: REVIEW - APAR solution is being reviewed. PE PTF List: PTF List: Parent APAR: Child APAR list: ERROR DESCRIPTION: In a CICS transaction isolation enviroment (ie. subspaces are being utilized), very high performance overhead occurs in IAXVP during CSP processing due to the private storage getmains being done which drives page table initialization. The cause of the high performance impact is the PTLB (purge translation lookaside buffers) which occurs upon the CSP instruction. LOCAL FIX: Note: This problem will not be encountered if NOT running in a CICS transaction isolation environment where subspaces are NOT utilized. -- Mark Jacobs Time Customer Service Tampa, FL ---- Progress doesn't come from early risers - progress is made by lazy men looking for easier ways to do things. Robert A. Heinlein - Time Enought for Love(1973) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
