Se o apache usar o threading mpm, use flag -f para strace
E use o sinalizador -c
#strace -fcp 1268
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
-nan 0.000000 0 4 1 read
-nan 0.000000 0 1 write
-nan 0.000000 0 1 open
-nan 0.000000 0 2 close
-nan 0.000000 0 18 gettimeofday
-nan 0.000000 0 1 munmap
-nan 0.000000 0 1 writev
-nan 0.000000 0 2 poll
-nan 0.000000 0 1 mmap2
-nan 0.000000 0 2 stat64
-nan 0.000000 0 6 fcntl64
-nan 0.000000 0 29 25 futex
-nan 0.000000 0 1 accept
-nan 0.000000 0 1 getsockname
-nan 0.000000 0 1 shutdown
------ ----------- ----------- --------- --------- ----------------
100.00 0.000000 71 26 total
gettimeofday chamada muito simples. O problema é outra coisa.