On Thu, Mar 02, 2006 at 11:50:29PM +0000, Nick Barnes wrote: > At 2006-03-02 22:24:17+0000, Nik Clayton writes: > > I'm failing to understand how getrusage() works, which is a bit perplexing, > > because it doesn't seem like it would be terribly complicated. > > ru_maxrss is the maximum resident set size, not the heap size. > malloc(big) doesn't grow the resident set. Touching the memory you > have allocated will grow the resident set. Try this: > > getrusage(RUSAGE_SELF, &ru); > printf("%lu\n", ru.ru_maxrss); > p = malloc(SIZE); > assert(p) > getrusage(RUSAGE_SELF, &ru); > printf("%lu\n", ru.ru_maxrss); > for (i=0; i<SIZE; ++i) { > p[i] = 0; > } > getrusage(RUSAGE_SELF, &ru); > printf("%lu\n", ru.ru_maxrss);
Well, there was a call to memset() in the original Nik's program while your code just does the same by itself. Personally, I'd like to say a "me too". /me too fails to see why in a quiet, idle system ru_maxrss is very unpredictable over numerous runs of the test program, both before and after the malloc+memset. Filling the memory with a non-zero value doesn't matter. Is it the Heizenberg daemon at work? :-) -- Yar _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"