Tweaking these settings can be immensely helpful, and anyone using apache should know how - just please make sure your hardware can handle the software configuration you set up. largest process that can be called uses 178mb, so 200mb, and your current VM on only has 1gb of RAM - I'd set max_children to 2 - then when you upgrade your VM (what're you doing with 1gb in 2021?) and you have 8gb of RAM on your server, you can use max_children = 18 Notice in both examples the rounding is in favor of extra resources, and after doubling for fpm's purpose, leaves behind a chunk of memory for the OS, and other background processes to use. so if you have to wait for something, go to sleep for a few seconds instead of occupying the cpu while doing absolute nothing but waitting. what results in better response times and lower overall system-load. This means that data written to the output buffer will not show up until a certain amount of the buffer has been filled. sleep (PHP 4, PHP 5, PHP 7, PHP 8) sleep Delay execution Description ¶ sleep ( int seconds ): int Delays the program execution for the given number of seconds. If you're doing this for any type of mission critical business web server I'd aim to round up then double all estimates. the idea of sleep and usleep is that by letting the cpu run a few idle cycles so the other programs can have some cycles run of their own. First problem is that stuff you write to the PHP output buffer is normally not sent to the browser immediately, it is buffered on the server for performance reasons. 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). A much better solution is to use the one of the two script sleep functions, sleep() and usleep(), which take the amount of time to pause execution as their only parameter. The answer is yes, it is possible This simple utility will let you do it. This roundoff leads to a maximum sleep time of just under 4295 seconds (1 hour, 11 minutes, 35 seconds). If (processing requirements * start_servers > CPU)Īnd always know your hardware before tweaking these settings, especially in dynamic/on demand (imo, easier to make mistakes). Secondly, PHP has to sit there looping thousands of times while it waits, essentially doing nothing. 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. If (process memory usage * max_children > RAM) Here is an example: As you posted in your own answer (and I'm glad it worked) increasing the number of allowed children can be a good solution - but there's a lot that goes into optimizing php-fpm, and certainly more thought should be given to the entire system before making these configuration changes.īut no matter what you should know when using static values: You just need to call the function and pass the number of microseconds to pause the execution of the script. You have a task waiting to be started (5 active, 0 idle, 6 tasks).
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