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  • strace

    <strong><span style="color:#ff0000;FONT-FAMILY: '宋体','MS Sans Serif',sans-serif; FONT-SIZE: 14pt">strace -fr -o /tmp/xxx.log -p</span></strong>
    
    sys 高 OS本身的问题
    
    
        -c          Count  time, calls, and errors for each system call and report a summary on program exit.  On Linux, this attempts to show
                       system time (CPU time spent running in the kernel) independent of wall clock time.  If -c is used with -f or  -F  (below),
                       only aggregate totals for all traced processes are kept.
    
      -T          Show the time spent in system calls. This records the time difference between the beginning and the  end  of  each  system
                       call.
    
    
    
    ----通过strace跟踪
    [root@oradbsvr ~]# strace -c -T -p 14891
    Process 14891 attached - interrupt to quit
    Process 14891 detached
    % time     seconds  usecs/call     calls    errors syscall
    ------ ----------- ----------- --------- --------- ----------------
    100.00    4.143606      276240        15           read
      0.00    0.000013           1        13           mprotect
      0.00    0.000000           0        12         1 open
      0.00    0.000000           0         9           close
      0.00    0.000000           0         4           stat
      0.00    0.000000           0         4           fstat
      0.00    0.000000           0         8           mmap
      0.00    0.000000           0         5           munmap
      0.00    0.000000           0         3           brk
      0.00    0.000000           0        22           rt_sigaction
      0.00    0.000000           0         3           rt_sigprocmask
      0.00    0.000000           0         3         1 access
      0.00    0.000000           0         8         8 shmget
      0.00    0.000000           0         2           dup
      0.00    0.000000           0         2           fcntl
      0.00    0.000000           0         2           umask
      0.00    0.000000           0         3           getrlimit
      0.00    0.000000           0         2           times
      0.00    0.000000           0         1           sigaltstack
      0.00    0.000000           0         2           setrlimit
      0.00    0.000000           0         2           futex
      0.00    0.000000           0         1           set_tid_address
      0.00    0.000000           0         1           set_robust_list
    ------ ----------- ----------- --------- --------- ----------------
    100.00    4.143619                   127        10 total
    [root@oradbsvr ~]# strace -c -T -p 14891
    Process 14891 attached - interrupt to quit
    Process 14891 detached
    % time     seconds  usecs/call     calls    errors syscall
    ------ ----------- ----------- --------- --------- ----------------
     46.42    1.456097       50210        29           read
     39.30    1.232811      616406         2           io_setup
      7.14    0.223964       13174        17           mmap
      3.57    0.111982       12442         9           write
      3.57    0.111982      111982         1           getcwd
      0.00    0.000031           8         4           socket
      .................
      0.00    0.000000           0       235           getrusage
      0.00    0.000000           0        19           times
      0.00    0.000000           0         2           getuid
      0.00    0.000000           0         1           geteuid
      0.00    0.000000           0         1           getegid
      0.00    0.000000           0         2           getppid
      0.00    0.000000           0         1           setrlimit
      0.00    0.000000           0         1           futex
      0.00    0.000000           0         1           io_destroy
    ------ ----------- ----------- --------- --------- ----------------
    100.00    3.136867                   450        15 total
    [root@oradbsvr ~]# strace -c -T -p 14990
    Process 14990 attached - interrupt to quit
    Process 14990 detached
    % time     seconds  usecs/call     calls    errors syscall
    ------ ----------- ----------- --------- --------- ----------------
     99.98    0.111982       27996         4           write
      0.02    0.000022           0       137           getrusage
      0.00    0.000000           0         6           read
      0.00    0.000000           0         1         1 open
      0.00    0.000000           0         4           close
      0.00    0.000000           0         8           poll
      0.00    0.000000           0         2           lseek
      0.00    0.000000           0         4           munmap
      0.00    0.000000           0        16           rt_sigaction
      0.00    0.000000           0         4           rt_sigprocmask
      0.00    0.000000           0         1           setitimer
      0.00    0.000000           0         3           setsockopt
      0.00    0.000000           0         1           shmdt
      0.00    0.000000           0        22           times
    ------ ----------- ----------- --------- --------- ----------------
    100.00    0.112004                   213         1 total
    
    

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13352044.html
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