In my experience, Elastic Search(ES) is resources intensive: CPU, Memory, disk i/o and Network. Is there any contention or resource wait for disk i/o (where are the files/data)? How about z/VM Memory, Linux memory and paging? Any network contention? == About steal in Linux, if Linux is not using all the vCPU at high percent, reducing the number of vCPU may help. It is easier to add vCPU without Linux reboot. To reduce vCPU count you can do that with chcpu, just don't cp detach from the Linux VM, that force a reset. == Michel Beaulieu IBM Services (Canada) /* Comments expressed here are my own and do not engage my company in any way */
________________________________ From: Linux on 390 Port <[email protected]> on behalf of Rob van der Heij <[email protected]> Sent: February 6, 2021 12:18 PM To: [email protected] <[email protected]> Subject: Re: Elasticsearch and Openshift on zVM - Suffering from CPU steal ? On Sat, 6 Feb 2021 at 12:45, Mariusz Walczak > > So far everyone is just saying "you need more IFLs". But why do I need more > IFLs if I'm using 40% of CEC IFL capacity ? Anyone interested in z/VM performance would indeed want to study monitor data from the two situations. I’m no smarter to try without either. IIRC Elastic Search is mostly Java that like CPU and normally multithreaded. But Java also assumes to have the virtual CPU for itself. If you spread very thin, so have lots of virtual CPUs competing, Java finds each virtual CPU running only for a short time and is using only part of your capacity. I’d start with reducing the number of virtual CPUs in your OCP worker nodes. Rob > > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
