[root@localhost test]# strace -f -F -e trace=fdatasync,fsync -p 4043
Process 8703 attached with 23 threads - interrupt to quit [pid 7089] fsync(9) = 0 [pid 4063] fsync(9) = 0 [pid 4063] fsync(9) = 0 [pid 4061] fsync(4) = 0 [pid 4050] fsync(4) = 0 [pid 4050] fsync(20) = 0 [pid 4061] fsync(4) = 0 [pid 4050] fsync(12) = 0 [pid 4061] fsync(4) = 0 [pid 4050] fsync(14) = 0 [pid 4061] fsync(4) = 0 [pid 4050] fsync(4) = 0 [pid 4061] fsync(4) = 0 [pid 4052] fsync(4) = 0 [pid 4061] fsync(4) = 0 [pid 4053] fsync(4) = 0 [pid 4045] fsync(9) = 0
[root@localhost test]# strace -f -F -c -p 4043
% time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 60.99 0.154980 1084 143 io_getevents 23.66 0.060119 911 66 16 futex 10.23 0.025997 1625 16 select 2.36 0.006000 1200 5 4 restart_syscall 1.97 0.005000 625 8 fsync 0.39 0.001000 40 25 clock_gettime 0.39 0.000999 250 4 pwrite 0.00 0.000000 0 1 write 0.00 0.000000 0 4 sched_yield 0.00 0.000000 0 1 sendto 0.00 0.000000 0 3 1 recvfrom 0.00 0.000000 0 4 io_submit ------ ----------- ----------- --------- --------- ---------------- 100.00 0.254095 280 21 total
原文：http://www.cnblogs.com/zengkefu/p/5636367.html