* Vivek Goyal (vgo...@redhat.com) wrote: > Hi All, > > virtiofsd default thread pool size is 64. To me it feels that in most of > the cases thread pool size 1 performs better than thread pool size 64. > > I ran virtiofs-tests. > > https://github.com/rhvgoyal/virtiofs-tests > > And here are the comparision results. To me it seems that by default > we should switch to 1 thread (Till we can figure out how to make > multi thread performance better even when single process is doing > I/O in client). > > I am especially more interested in getting performance better for > single process in client. If that suffers, then it is pretty bad. > > Especially look at randread, randwrite, seqwrite performance. seqread > seems pretty good anyway. > > If I don't run who test suite and just ran randread-psync job, > my throughput jumps from around 40MB/s to 60MB/s. That's a huge > jump I would say. > > Thoughts?
What's your host setup; how many cores has the host got and how many did you give the guest? Dave > Thanks > Vivek > > > NAME WORKLOAD Bandwidth IOPS > > cache-auto seqread-psync 690(MiB/s) 172k > > cache-auto-1-thread seqread-psync 729(MiB/s) 182k > > > cache-auto seqread-psync-multi 2578(MiB/s) 644k > > cache-auto-1-thread seqread-psync-multi 2597(MiB/s) 649k > > > cache-auto seqread-mmap 660(MiB/s) 165k > > cache-auto-1-thread seqread-mmap 672(MiB/s) 168k > > > cache-auto seqread-mmap-multi 2499(MiB/s) 624k > > cache-auto-1-thread seqread-mmap-multi 2618(MiB/s) 654k > > > cache-auto seqread-libaio 286(MiB/s) 71k > > cache-auto-1-thread seqread-libaio 260(MiB/s) 65k > > > cache-auto seqread-libaio-multi 1508(MiB/s) 377k > > cache-auto-1-thread seqread-libaio-multi 986(MiB/s) 246k > > > cache-auto randread-psync 35(MiB/s) 9191 > > cache-auto-1-thread randread-psync 55(MiB/s) 13k > > > cache-auto randread-psync-multi 179(MiB/s) 44k > > cache-auto-1-thread randread-psync-multi 209(MiB/s) 52k > > > cache-auto randread-mmap 32(MiB/s) 8273 > > cache-auto-1-thread randread-mmap 50(MiB/s) 12k > > > cache-auto randread-mmap-multi 161(MiB/s) 40k > > cache-auto-1-thread randread-mmap-multi 185(MiB/s) 46k > > > cache-auto randread-libaio 268(MiB/s) 67k > > cache-auto-1-thread randread-libaio 254(MiB/s) 63k > > > cache-auto randread-libaio-multi 256(MiB/s) 64k > > cache-auto-1-thread randread-libaio-multi 155(MiB/s) 38k > > > cache-auto seqwrite-psync 23(MiB/s) 6026 > > cache-auto-1-thread seqwrite-psync 30(MiB/s) 7925 > > > cache-auto seqwrite-psync-multi 100(MiB/s) 25k > > cache-auto-1-thread seqwrite-psync-multi 154(MiB/s) 38k > > > cache-auto seqwrite-mmap 343(MiB/s) 85k > > cache-auto-1-thread seqwrite-mmap 355(MiB/s) 88k > > > cache-auto seqwrite-mmap-multi 408(MiB/s) 102k > > cache-auto-1-thread seqwrite-mmap-multi 438(MiB/s) 109k > > > cache-auto seqwrite-libaio 41(MiB/s) 10k > > cache-auto-1-thread seqwrite-libaio 65(MiB/s) 16k > > > cache-auto seqwrite-libaio-multi 137(MiB/s) 34k > > cache-auto-1-thread seqwrite-libaio-multi 214(MiB/s) 53k > > > cache-auto randwrite-psync 22(MiB/s) 5801 > > cache-auto-1-thread randwrite-psync 30(MiB/s) 7927 > > > cache-auto randwrite-psync-multi 100(MiB/s) 25k > > cache-auto-1-thread randwrite-psync-multi 151(MiB/s) 37k > > > cache-auto randwrite-mmap 31(MiB/s) 7984 > > cache-auto-1-thread randwrite-mmap 55(MiB/s) 13k > > > cache-auto randwrite-mmap-multi 124(MiB/s) 31k > > cache-auto-1-thread randwrite-mmap-multi 213(MiB/s) 53k > > > cache-auto randwrite-libaio 40(MiB/s) 10k > > cache-auto-1-thread randwrite-libaio 64(MiB/s) 16k > > > cache-auto randwrite-libaio-multi 139(MiB/s) 34k > > cache-auto-1-thread randwrite-libaio-multi 212(MiB/s) 53k > > > > > > > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
