He said z13 & z/OS2.2. Sent from my BlackBerry 10 smartphone on the Bell network. Original Message From: michelbutz Sent: Thursday, May 26, 2016 13:35 To: IBM-MAIN@LISTSERV.UA.EDU Reply To: IBM Mainframe Discussion List Subject: Re: SUSPEND/RESUME is slower than WAIT/POST. PAUSE/RELEASE is slower than both.
Can you tell us the following What type of processor The work load What version of z/OS these are relevant factors Sent from my iPhone > On May 26, 2016, at 1:29 PM, Jerry Callen <jcal...@narsil.org> wrote: > > (A very delayed follow-up on a thread from yesteryear...) > > tl;dr: In unauthorized code, ECBs are much faster than pause elements. > > I wrote a simple test program to compare the performance of WAIT/POST and > pause elements. The program has two tasks and simply ping-pongs back and > forth between them (no overlapped execution). Each task has a synchronization > gadget, either an ECB or a pause element. The tasks use each other's > synchronization gadget to just transfer control back and forth between each > other in a loop. This is a pretty unrealistic test (in terms of being like > anything "real" code would do), but it does illustrate the relative > performance of the two synchronization methods. > > Note that this unauthorized code, and tasks, not SRBs This means that all of > the synchronization primitives used SVCs, not branch entry points. The code > is 64-bit C++ compiled with xlC using -q64 and thread_create() to create the > tasks. The code is running on a z13, native LPAR, z/OS 2.2. > > The mechanisms I tested are: > > * ECBs: each task just alternates between a WAIT on its own ECB and a POST of > the other task's ECB. > * Pause elements with Pause (iea4pse) and Release (iea4rls) taking the role > of WAIT and POST. > * Pause elements using Transfer (iea4xfr) in "transfer and pause" mode (one > call to do both). > * Pause elements using Transfer (iea4xfr) in "just transfer" mode followed by > Pause (iea4pse). > > Here are the results: > > Relative performance: total CPU > ECB 1.0 > Pause/Resume 4.30 > Transfer and Pause 3.25 > Transfer with separate Pause 4.55 > > Relative performance: elapsed > ECB 1.0 > Pause/Resume 6.06 > Transfer and Pause 4.75 > Transfer with separate Pause 6.28 > > -- Jerry > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
