Hi,

I have a bunch of nginx and php-fpm worker threads. I am running a very simple test with a script doing: <? sleep(20); ?>. I notice that if I make two requests at the same time (from the same IP address), they get serialized on the php-fpm side and have a twenty second differential. Why would this happen and the two requests not get processed in parallel when there are an abundant number of threads? Here are the two requests in the slow log file and they have a twenty second difference:

Sep 26 19:02:38.177091 pid 13597 (pool default) script_filename = /var/www/test1/test.php [0x00000000095b5280] sleep() /var/www/test1/test.php:2

Sep 26 19:02:58.321560 pid 13609 (pool default) script_filename = /var/www/test1/test.php [0x000000000942a890] sleep() /var/www/test1/test.php:2

I have 100+ nginx threads $ ps -afe | grep nginx | wc -l 120

and 150 php-fpm threads $ ps -afe | grep php-fpm | wc -l 150

Thanks, Ankur