Would be interesting to see tests done on UTF-8 strings as this is the only type that Java supports. On a side note, Merry Christmas everyone! Ivan.
On Dec 25, 4:52 am, Michael Gardner <gardne...@gmail.com> wrote: > On Dec 24, 2010, at 8:19 PM, David Nolen wrote: > > > ((long double) end-start) / 1000.0 > > I don't think this math is correct. The units for the values returned by > mach_absolute_time() are > CPU-dependent:http://developer.apple.com/library/mac/#qa/qa2004/qa1398.html > > Using gettimeofday() on my 2.0 GHz Core 2 Duo Macbook, I get minima of ~3400 > microseconds for unoptimized C, ~800 microseconds for -O2. > > #include <stdio.h> > #include <sys/time.h> > > unsigned count_chars(char const * s) { > unsigned count = 0; > while (*s++) > if (*s != ' ') > ++count; > return count; > > } > > int main(int argc, char** argv) { > char const * s = "This is a really long stringThis is a really long > stringThis is a really long stringThis is a really long stringThis is a > really long stringThis is a really long stringThis is a really long > stringThis is a really long stringThis is a really long stringThis is a > really long stringThis is a really long stringThis is a really long > stringThis is a really long stringThis is a really long stringThis is a > really long stringThis is a really long stringThis is a really long > stringThis is a really long stringThis is a really long stringThis is a > really long string"; > unsigned i, j; > struct timeval start, end; > > for (j = 0; j < 10; ++j) { > gettimeofday(&start, 0); > for (i = 0; i < 1000; ++i) > count_chars(s); > gettimeofday(&end, 0); > printf("%u us\n", (unsigned)(1000000 * (end.tv_sec - start.tv_sec) + > (end.tv_usec - start.tv_usec))); > } > > return(0); > > > > > > > > } -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
