[rsyslog] high-performance, low-precision time API under linux?

[Aaron Wiebe]

I went over your post...

You shouldn't be seeing a 4ms response time on a gettimeofday() call -
this is my test:

gettimeofday({1245079355, 445434}, NULL) = 0 <0.000004>
gettimeofday({1245079355, 445503}, NULL) = 0 <0.000004>
gettimeofday({1245079355, 445560}, NULL) = 0 <0.000003>
gettimeofday({1245079355, 445629}, NULL) = 0 <0.000004>

That's 3-4 microseconds.

For the sake of argument, I checked time() as well, which is obsoleted
by gettimeofday()...

ime(NULL)                              = 1245079501 <0.000008>
time(NULL)                              = 1245079501 <0.000007>
time(NULL)                              = 1245079501 <0.000004>
time(NULL)                              = 1245079501 <0.000008>
time(NULL)                              = 1245079501 <0.000004>

About half the speed, but still in the microsecond range.

gettimeofday() is one of the fastest syscalls you can issue.
Obviously you don't want to beat on it, but I wouldn't worry about
calling it a few dozen times per second.

-Aaron