Even better, try John Burg of the 'Washington Systems Center '. He used to have presentations on the TechDoc website and also presented at SHARE.
Sent from Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Lennie Dymoke-Bradshaw <[email protected]> Sent: Thursday, March 2, 2023 1:10:47 AM To: [email protected] <[email protected]> Subject: Re: Hardware instrumentation presentation I recommend you speak to Martin Packer at IBM. Lennie -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Colin Paice Sent: 01 March 2023 18:00 To: [email protected] Subject: Hardware instrumentation presentation I've been asked to give a talk on performance to a University Computing department. I know the z hardware has in builtin instrumentation which allows you to see where the delays were for a particular instruction. For example this load instruction got data from the L3 cache and it took x nano seconds. Is there a presentation on this? I remember seeing a presentation (it may have been IBM confidential) showing that a Load could be slow, if the data was in a the cache in a book 3 ft away, compared to it being in the cache on the chip. Also the second time round a loop is faster than the first time because the instructions are in the instruction cache. This was all mind blowing stuff! Colin ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
