debugging - How to use strace to only show calls that take a lot of time? -

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is there way grep calls on amount of time?

it looks there flag shows cpu time in output (-c):

man strace

sample output:

sysadm@brownie:~$ strace -c ./crypt_crack.py % time     seconds  usecs/call     calls    errors syscall ------ ----------- ----------- --------- --------- ----------------  84.38    0.000027           0       340       273 open  15.63    0.000005           0        67           rt_sigaction   0.00    0.000000           0        91           read   0.00    0.000000           0        67           close   0.00    0.000000           0       117        89 stat   0.00    0.000000           0        96           fstat   0.00    0.000000           0         1           lstat   0.00    0.000000           0         3           lseek   0.00    0.000000           0        64           mmap   0.00    0.000000           0        17           mprotect   0.00    0.000000           0        30           munmap   0.00    0.000000           0         8           brk   0.00    0.000000           0         1           rt_sigprocmask   0.00    0.000000           0         4         2 ioctl   0.00    0.000000           0         1         1 access   0.00    0.000000           0         1           execve   0.00    0.000000           0         1           uname   0.00    0.000000           0         2           fcntl   0.00    0.000000           0         4           getdents   0.00    0.000000           0         1           getcwd   0.00    0.000000           0         1         1 readlink   0.00    0.000000           0         1           getrlimit   0.00    0.000000           0         1           arch_prctl   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    0.000032                   923       366 total  sysadm@brownie:~$

when run -c flag, strace appears hold output until execution terminates (gracefully or ctrl-c)

and awk cpu time == 0.0:

sysadm@brownie:~$ strace -c ls -la 2>&1 | awk '{if ($2 == 0.0) print;}'   0.00    0.000000           0        23           read   0.00    0.000000           0         1           write   0.00    0.000000           0        34        12 open   0.00    0.000000           0        27           close   0.00    0.000000           0        34           stat   0.00    0.000000           0        23           fstat   0.00    0.000000           0        34           lstat   0.00    0.000000           0         1           lseek   0.00    0.000000           0        41           mmap   0.00    0.000000           0        12           munmap   0.00    0.000000           0         3           brk   0.00    0.000000           0         2           rt_sigaction   0.00    0.000000           0         1           rt_sigprocmask   0.00    0.000000           0         2         2 ioctl   0.00    0.000000           0         2         1 access   0.00    0.000000           0         4           socket   0.00    0.000000           0         4         4 connect   0.00    0.000000           0         1           execve   0.00    0.000000           0         1           uname   0.00    0.000000           0        13           fcntl   0.00    0.000000           0         2           getdents   0.00    0.000000           0         1           getrlimit   0.00    0.000000           0         1           arch_prctl   0.00    0.000000           0        67        67 getxattr   0.00    0.000000           0         1           futex   0.00    0.000000           0         1           set_tid_address   0.00    0.000000           0         1           clock_gettime   0.00    0.000000           0         1           set_robust_list sysadm@brownie:~$

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