Hello. In strace -fc can see much read errors
one node profile % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 69.69 308.552624 1429 215918 90423 futex 24.42 108.134446 4920 21977 epoll_wait 3.56 15.748986 2624831 6 nanosleep 1.73 7.672475 142083 54 50 restart_syscall 0.22 0.956059 956059 1 accept 0.19 0.820051 13668 60 pwrite 0.09 0.390909 77 5101 1 read 0.06 0.281399 110 2555 100 write 0.04 0.184663 151 1225 writev 0.00 0.015865 79 200 poll 0.00 0.012001 600 20 msync 0.00 0.001499 15 101 open 0.00 0.001456 364 4 select 0.00 0.000957 37 26 time 0.00 0.000294 3 100 ioctl 0.00 0.000246 2 100 fstat 0.00 0.000176 1 295 close 0.00 0.000165 0 503 101 setsockopt 0.00 0.000104 1 202 102 connect 0.00 0.000099 1 100 sendto cluster mode % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 69.67 322.516742 1396 230948 96614 futex 25.09 116.142408 6213 18694 epoll_wait 2.99 13.852866 2770573 5 nanosleep 1.38 6.371364 117988 54 50 restart_syscall 0.77 3.564223 3564223 1 accept 0.05 0.217641 86 2524 1 write 0.04 0.204011 10737 19 pwrite 0.00 0.014455 14455 1 munmap 0.00 0.005451 1 5939 1687 read 0.00 0.001970 493 4 select 0.00 0.000149 4 39 14 writev 0.00 0.000000 0 2 open 0.00 0.000000 0 4 close 0.00 0.000000 0 22 stat 0.00 0.000000 0 1 mmap 0.00 0.000000 0 4 brk 0.00 0.000000 0 2 rt_sigprocmask Thanks. On Wed, Jan 30, 2013 at 3:57 PM, Maksim Anfilatov < [email protected]> wrote: > Hello. > > Please help with performance trouble - > > in standalone mode - 20MB/sec > in cluster mode - 60KB/sec > > Tested scenario - start one node, start wget batch, 20MB/sec, start second > node, machine up in logs at both nodes, next or later file 60KB/sec, stop > second node, machine down in logs, immediate to 20MB/sec. > > Tested versions - 3.2.0, 3.2.4, 3.2-taobao, 3.3-HEAD. > > Linux ats02 3.2.0-4-amd64 #1 SMP Debian 3.2.35-2 x86_64 GNU/Linux (tested > on kernel 2.95 too). > > Thanks. > -- С уважением, Максим Анфилатов. ФГУП ВГТРК, ПТД, ДИТ, УИИТ, ОБД, ведущий программист +7-909-9101913
