Hi, Several months ago we conducted two tests on our system. In the first test, when cics transaction rate reached 9000, response time deteriorated badly. So we stopped the PPRC and repeated the test. As expected, we got very good response time.
Surprisingly, however, our transaction cpu time also decreased from 2.6ms to 1.9ms. This goes beyond my knowledge and imagination. As I know, z/os starts an io request to channel subsystem and then goes to process other things. When that io is ready, channel subsystem will interrupt the cpu and z/os gets to process the interruption. In the above process, I can see no place where user program's cpu usage can be affected. Of course you'll get better response time. Thanks. Best Regards, Johnny Luo ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
