Thanks Martin. -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Martin Packer Sent: Friday, May 1, 2020 2:59 PM To: [email protected] Subject: Re: z/OS performance question
This message was sent from an external source outside of Western & Southern's network. Do not click links or open attachments unless you recognize the sender and know the contents are safe. ________________________________________________________________________________________________________________________ It's normal for different transport classes to show different request rates - and that would show up in the signalling paths they own as similar imbalances. Within a transport class would be more worrying - as that would show one path outperforming another. Actually, nowadays, CF structure paths might well show more traffic than CTCs - for the same transport class. The "structure CPU" numbers you're seeing are from R744SETM "Structure Execution Time" in SMF 74-4. There's nothing particularly bad about their numbers, and they might vary wildly by time of day. But they might cause you to look at overall CF Busy (from 74-4 rather than 70-1, though the latter would matter for SHARED CF images). Hoping this is useful. Cheers, Martin Martin Packer zChampion, Systems Investigator & Performance Troubleshooter, IBM +44-7802-245-584 email: [email protected] Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker Podcast Series (With Marna Walle): https://developer.ibm.com/tv/mpt/ or https://itunes.apple.com/gb/podcast/mainframe-performance-topics/id1127943573?mt=2 Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA From: "Edgington, Jerry" <[email protected]> To: [email protected] Date: 01/05/2020 19:44 Subject: [EXTERNAL] Re: z/OS performance question Sent by: IBM Mainframe Discussion List <[email protected]> Thanks Allen, that is good place to start. The CPU% for the ISGLOCK, IXCSTR1 and IXCSTR2 are 58%, 74% and 21%, which seem very high to me. But, the IXCSTR3 and IXCSTR4 are very low. It would seem I might have an imbalance with the XCF messages and size. Async rate for IXCSTR1 is 120 I am wondering if I need to adjust my CLASSDEF CLASSLEN size for each of the structures. We are running ICFs on GP, with one virtual connection to each ICFA/B. Not ideal, but all I could do at the moment. /* TRANSPORT CLASSES. */ CLASSDEF CLASS(SML) CLASSLEN(956) GROUP(UNDESIG) CLASSDEF CLASS(MED) CLASSLEN(8000) CLASSDEF CLASS(DEFAULT) CLASSLEN(16316) CLASSDEF CLASS(BIG) CLASSLEN(32000) /* XCF STRUCTURES */ PATHOUT STRNAME(IXCSTR1) CLASS(SML) PATHOUT STRNAME(IXCSTR2) CLASS(MED) PATHOUT STRNAME(IXCSTR3) CLASS(BIG) PATHOUT STRNAME(IXCSTR4) CLASS(DEFAULT) /* */ PATHIN STRNAME(IXCSTR1,IXCSTR2,IXCSTR3,IXCSTR4) Also, we have: FUNCTIONS ENABLE(DUPLEXCF16, SYSSTATDETECT, CRITICALPAGING) Thanks Jerry -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Allan Staller Sent: Friday, May 1, 2020 2:32 PM To: [email protected] Subject: Re: z/OS performance question This message was sent from an external source outside of Western & Southern's network. Do not click links or open attachments unless you recognize the sender and know the contents are safe. ________________________________________________________________________________________________________________________ The only tuning I a aware of for XCF is to provide appropriate transport classes for the messages being passed. If inappropriate, this will usually show up as CPU concumption in the XCFAS address space. Look at the CPU consumed, not the delay. It is possible that this is contributing to the CICS delays. GRS will use XCF if available. -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Edgington, Jerry Sent: Friday, May 1, 2020 12:30 PM To: [email protected] Subject: z/OS performance question [CAUTION: This Email is from outside the Organization. Unless you trust the sender, Don’t click links or open attachments as it may be a Phishing email, which can steal your Information and compromise your Computer.] To anyone, I am not a performance person at all, but can someone help me with pointing me in the right direction. We are running a small SYSplex, but we are getting delays on one LPAR, PROC-XCFAS *SYSTEM PROC-XCFAS 3.7 users ALL STC PROC-XCFAS 3.2 users IMS PROC-XCFAS 26.0 % delay RMF PROC-XCFAS 18.0 % delay RMFGAT PROC-XCFAS 21.0 % delay IMSCTL PROC-XCFAS 25.0 % delay TN3270 PROC-XCFAS 28.0 % delay VTAM PROC-XCFAS 19.0 % delay Also, we are ACF2 shop and our production CICS regions are getting delays: ENQ -ACFVSAM 38.0 % delay LOGONIDS ENQ -ACF2ACB 100.0 % delay LOGONIDS So any help would be great. 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