I suppose that is reasonable for a single threaded, CPU bound job as a little is lost from each engine as another is added. However, you should be able to run more concurrent work giving a better over all through put.
Another benefit of another engine is that, if not needed for anything else, z/os likes to direct I/O interupts to just one engine. This allows the other engines run a little smoother and again should increase your overall thoughput. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of gsg Sent: Thursday, February 09, 2012 10:39 AM To: [email protected] Subject: Turning on additional CPs We have a z10 with 4 engines. Since upgrading to this box, we were only running 3 engines. However, we recently turned on the 4th engine. We noticed that several jobs started running longer, which we didn't expect. Could turning on additional engines actually make a job run longer? Also, where can I find any read material on the affect of turning on/off engines. TIA ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
