I have observed that the same CVS checkout command takes different
running times on multiple calls and that a script calling cvs checkout
many times takes very long. Using strace I see that CVS waits for the
next second start after its work has been done, right before exiting:
Trace of first call to cvs checkout <dir>
...
20:50:17.149775 close(4) = 0
20:50:17.149807 time([1356465017]) = 1356465017
20:50:17.149840 time([1356465017]) = 1356465017
20:50:17.149873 nanosleep({0, 850134000}, NULL) = 0
20:50:18.000114 time([1356465017]) = 1356465017
20:50:18.000154 nanosleep({0, 20000000}, NULL) = 0
20:50:18.020252 fchdir(3) = 0
20:50:18.020289 close(3) = 0
20:50:18.020328 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
20:50:18.020372 close(1) = 0
20:50:18.020406 munmap(0x7f9d28936000, 4096) = 0
20:50:18.020487 exit_group(0) = ?
Another call to cvs checkout <dir>
...
20:50:31.325934 close(4) = 0
20:50:31.325968 time([1356465031]) = 1356465031
20:50:31.325991 time([1356465031]) = 1356465031
20:50:31.326013 nanosleep({0, 673991000}, NULL) = 0
20:50:32.000130 time([1356465031]) = 1356465031
20:50:32.000186 nanosleep({0, 20000000}, NULL) = 0
20:50:32.020282 fchdir(3) = 0
20:50:32.020320 close(3) = 0
20:50:32.020364 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
20:50:32.020413 close(1) = 0
20:50:32.020448 munmap(0x7f905e4fb000, 4096) = 0
20:50:32.020564 exit_group(0) = ?
And a third call to checkout that smae directory.
...
20:50:45.906568 close(4) = 0
20:50:45.906601 time([1356465045]) = 1356465045
20:50:45.906633 time([1356465045]) = 1356465045
20:50:45.906667 nanosleep({0, 93340000}, NULL) = 0
20:50:46.000104 time([1356465045]) = 1356465045
20:50:46.000144 nanosleep({0, 20000000}, NULL) = 0
20:50:46.020238 fchdir(3) = 0
20:50:46.020274 close(3) = 0
20:50:46.020313 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
20:50:46.020357 close(1) = 0
20:50:46.020391 munmap(0x7f2c8f6a2000, 4096) = 0
20:50:46.020469 exit_group(0) = ?
What is the reason for CVS to do this? Is it because of time stamps
for history entries? And can I prevent CVS from sleeping?
urs
