![]() ![]() I restart php-fpm, and httpd, DB Connections suddenly drop and few minutes later they go up again.Äuring this period server RAM and CPU are below 30%. When I do SHOW PROCESSLIST, I see 800 rows with state SLEEP. This roundoff leads to a maximum sleep time of just under 4295 seconds (1 hour, 11 minutes, 35 seconds). Randomly during the day Moodle (or WebServers ) are opening too many DB connections to the DB, aroung ~800 connections.Īs soon as this starts happening our Moodle becomes unreachable, the response time of the website goes crazy, like 30-40s. At least on my Windows machine, the timesleepuntil function appears to calculate the number of microseconds between now and the sleep-until timestamp, and it appears to use unsigned 32-bit math in this calculation. Apache error logs doesn't show anything unusual. Running script locally via SSH console is very fast. Both functions are supported by PHP 4 and. Static HTML files are loaded without any delays. The sleep() function will delay the scripts execution in seconds while usleep() will delay it in microseconds. sleep () delays the execution of code by a given number of seconds. Our servers are running Apache/2.4.39, PHP 7.3.9 with php-fpm. Server's CPU, RAM and IO are all normal (checked with htop ). The php sleep () function gives us the ability to pause the execution of our code.For example, upgrading a PHP 5.6 application to PHP 7.3 typically doubles or triples application performance. Similar to the sleep() function, the usleep() function is used to introduce a delay in the execution of a PHP. Boost PHP Performance by Upgrading to PHP 7.x If youâre still running applications on PHP 5.6, upgrading to PHP 7.3 or PHP 7.4 will significantly speed performance. PHPEOL When you run the script, you'll notice a 3-second delay between the 'Start' and 'End' timestamps. We are hosting our Moodle instance on AWS, using a Load Balancer, EC2 instances behind the ELB, RDS ( MariaDB) and Redis ElasticCache for caching. If you wanted to pause your PHP script by 5 seconds or 1 second you would add the following to your codebase. PHPEOL sleep(3) // Pause the script for 3 seconds echo 'End: '. Is it a good idea or should I use different delay ways sleep () keeps a connection open, could this be a problem I do: index.php -> stuff.php -> index. ![]() So I will share our experience in the hope that you can shed some light on the situation. 1 Suppose a website with high traffic, I want to use the php sleep (4) function to avoid flooding. Moreover, you can also use this utility as a scheduler to do your tasks without involving a sleep mode. Besides that it can also send your system back into a sleep mode (hibernate it, power it off, or log-off a user). Hello we are experience a weird situation with our Moodle installation and we cannot find out how its happening. The answer is yes, it is possible This simple utility will let you do it.
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