]> If you're using a Pentium-class machine, then a nice trick is to wrap the RDTSC assembly instruction and call that. It returns number of clock cycles elapsed (a 64 bit number IIRC). Here's some code to get you started: #ifdef linux #include <sys/bitypes.h> #endif extern inline u_int64_t rdtsc (void) { u_int32_t hi, lo; #ifdef linux __asm__ ("rdtsc" : "=d" (hi), "=a" (lo)); #else __asm__ (".byte 0x0f,0x31" : "=d" (hi), "=a" (lo)); #endif return ((u_int64_t) hi) << 32 | lo; } Rich. -- Richard Jones. http://www.annexia.org/ http://freshmeat.net/users/rwmj Merjis Ltd. http://www.merjis.com/ - improving website return on investment "My karma ran over your dogma" ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners