>On 06/26/2015 03:49 PM, Atsushi Kumagai wrote: >> I attached 5 processors to the VM and I confirmed that all threads >> consumed full cpu time by top(1) on the host: >> >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >> 17614 qemu 20 0 5792m 4.9g 5652 R 435.1 72.8 29:02.17 qemu-kvm >> >> So I think the performance must be improved... > >Since I can't get that result in all machines here, could you test it with the patch:time >and show me the output? >Using "./makedumpfile -c --num-threads 4 /proc/vmcore dumpfile" is OK. > >The attachment is the patch time. Here is the result: / # makedumpfile -c --num-threads 4 /proc/vmcore /mnt/dumpfile Copying data : [100.0 %] | Copying data : [100.0 %] \ The dumpfile is saved to /mnt/dumpfile. makedumpfile Completed. lock time: 310s935500us write time: 3s970037us hit time: 6s316043us find time: 317s926654us loop_time: 37s321800us thread consume_time: 0s0us thread timea: 0s0us thread timeb: 0s0us read_time[0]: 8s637011us lock_current_time[0]: 0s284428us found_time[0]: 60s366795us lock_consumed_time[0]: 2s782596us compress_time[0]: 301s427073us read_time[1]: 8s435914us lock_current_time[1]: 0s271680us found_time[1]: 60s329026us lock_consumed_time[1]: 2s849061us compress_time[1]: 302s98620us read_time[2]: 8s380550us lock_current_time[2]: 0s270388us found_time[2]: 60s209376us lock_consumed_time[2]: 3s297574us compress_time[2]: 301s486768us read_time[3]: 8s550662us lock_current_time[3]: 0s278997us found_time[3]: 60s476702us lock_consumed_time[3]: 3s49184us compress_time[3]: 301s718390us count1: 172 count2: 70921401 count3: 0 count4: 0 count5: 0 count6: 0 count7: 0 exec time: 380s125494us BTW, I fixed a small mistake before testing like: - write_time = (write2.tv_sec - write1.tv_sec) * 1000000 + (write2.tv_usec - write1.tv_usec); + write_time += (write2.tv_sec - write1.tv_sec) * 1000000 + (write2.tv_usec - write1.tv_usec); Thanks Atsushi Kumagai
