Re: [PHP4] gettimeofday()

no, it's a stand-alone linux box (e-machine) with one processor (intel pIII). ---------------- remco chang bountyquest.com On Mon, 7 Aug 2000, Rasmus Lerdorf wrote: > Interesting. What sort of box is this? SMP? > > -Rasmus > > On Mon, 7 Aug 2000, Remco Chang wrote: > > > hi, > > > > i've been testing out the performance of php4 with apache and odbc driver > > (oob by easysoft.com) using gettimeofday() to find the amount of elapsed > > time... i'm running php4.0.1pl2 on redhat 6.2 with apache 1.3.12. > > > > the problem that i'm having is that gettimeofday seems to return time that > > "jumps backwards in time." here's an example of what i would get when i > > write a for loop to grab the current time ten thousand times: > > > > time: 965666189.9983 > > time: 965666189.99903 > > time: 965666189.99976 > > time: 965666181.00049 ********** > > time: 965666181.00123 > > time: 965666181.00197 > > > > note that this does not happen all the time... i would say in 10,000 > > times, this happens about 5 times or so. also note that strange enough, > > it always seems to jump backwards 9 seconds percisely... *boggle* > > > > i wrote a small program in c to test the <sys/time.h> gettimeofday() > > function to make sure that it's not a hardware issue, and it's not. :) > > > > does any one know if this is a problem with apache, php, or a combination > > of the two? is this a bug or is it due to some "smart forking" that php > > does to optimize for loops? > > > > thanx in advance for any help! > > > > attached is the program i wrote for testing: > > > > <?php > > > > function getCurrentTime () { > > $time_array = gettimeofday(); > > return $time_array["sec"] + ($time_array["usec"]/100000); > > } > > > > $cache_time = 0; > > $cur_time = 0; > > > > echo "test starts..."; > > > > for ($i=0; $i<10000; $i++) { > > $cur_time = getCurrentTime(); > > echo "<br>time: $cur_time"; > > if ($cur_time < $cache_time) { //if time starts going backwards > > echo " **********"; > > } > > $cache_time = $cur_time; > > } > > > > ?> > > > > > > ---------------- > > remco chang > > bountyquest.com > > > > > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net > >