Mariusz, Does your workload really require 16 virtual CPUs, or are you relying on a vendor to drive your decision making?
A good performance monitor will be a big help. Rich Smrcina Sr. Systems Engineer Velocity Software Inc. Main: (650) 964-8867 Main: (877) 964-8867 r...@velocitysoftware.com <mailto:r...@velocitysoftware.com> > On Aug 1, 2020, at 6:59 PM, Mariusz Walczak <blanc...@gmail.com> wrote: > > Hello Mark, > > Yes, that is what I meant. > Is there a way to increase zLinux capacity without buying physical IFL on > Mainframe? Can I make use of LPAR and zVM virtualization features to > achieve this? > > I already learnt that enabling SMT on zVM doubled our vCPU count (from 4 to > 8) on Hypervisor. After enabling the feature, CPU utilization On Mainframe > dropped from 95% to 60%. On the other hand, I'm wondering if it negatively > affected single threaded workloads? > > All the best > Mariusz > > > On Sun, 2 Aug 2020, 00:34 Mark Post, <mp...@suse.com> wrote: > >> On 7/31/20 7:46 PM, Mariusz Walczak wrote: >>> We have 4 IFL on Mainframe box, 4 IFL on zVM and 4 cpu on zLinux. I'd >> like >>> to gain zLinux capacity (run more processes) and increase to 16 cpu. >> Will I >>> degrade performance of a single threaded workload if I do this? >> >> Do you mean you want to specify 16 virtual CPUs for one Linux guest, >> while not changing the number of actual CPUs available to the LPAR? >> That's usually a bad idea. >> >> If you're talking about something different, please say so. >> >> >> Mark Post >> >> ---------------------------------------------------------------------- >> For LINUX-390 subscribe / signoff / archive access instructions, >> send email to lists...@vm.marist.edu 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 lists...@vm.marist.edu 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 lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
