Re: microtime questions

Tedd, The only way that I can even think of this as being possible is if you call microtime() instead of microtime(true). The former will return 'msec sec' separated by a space which can produce a negative number because you've essentially got two different types of measurements there. IMHO PHP should probably throw out an error when two strings are used in a mathematical way - in this case (without the TRUE arg) here is a possible equation that could be evaluated. 0.15290800 1144430717 - 0.86641600 1144430716 PHP evaluates this to -0.713508 (or 0.15290800 - 0.86641600) It's negative because we're not talking about msecs from the same second - it ignores the seconds and only pays attention to the microseconds. So if you're using microtime(true) how can this happen on your machine? Well, off the top of my head I think you should verify that your machine (or your hosting service) is running PHP5 || >. IF not, and error reporting is turned off, then you'll get a negative number from time to time since the seconds are being ignored.. http://php.net/microtime has an example of how to emulate microtime(true) on PHP < 5 Hope that helps! -Joe On 4/7/06, Brad Bonkoski <bbonkoski@mediaguide.com> wrote: > > How is the CPU not in question? Does this script run on air? > It may not be YOUR CPU, but it is still a CPU bound by the sceduling > algorithm of the Operating System, so the time differentials are too be > expected. > -B > > tedd wrote: > > > At 12:24 PM -0400 4/7/06, Brad Bonkoski wrote: > > > >> Interesting... > >> as for your first question... > >> Know that PHP/Apache does not have free reign to your CPU, so the > >> times could be different based on the scheduling going on in the OS > >> kernel. > >> > >> As for the second one... > >> No idea why you would get a negative number, I just copied and ran > >> from the command line and did not encounter 1 negative time for about > >> 30 runs.... > >> > >> Do you get negative times if you run it from the command line as well? > >> -B > >> > >>> RE: > >>> > >>> http://www.xn--ovg.com/microtime.php > >>> > > > > Brad: > > > > Thanks for looking. > > > > My questions are with regard to what happens on the site, not via my > > command line. As such, my command line and my CPU are not involved. > > > > Can you answer the questions as they pertain to the site in question? > > > > Thanks. > > > > tedd > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >