Ubuntu PHP is a resource-intensive solution

Ubuntu PHP takes up a lot of resources

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This is the case in itself, so when using PHP, you should pay attention to the problem of process occupancy.
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You're a Windows obsessive syndrome, it's okay, because the kernel mechanism of Linux, these cache content can increase the file and read and write speed. When your server request is idle, the system automatically handles the
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Nginx and PHP-FPM configuration remember to adjust well

Pm.max_children: The number of PHP-FPM processes that are open in static mode.
Pm.start_servers: The number of start PHP-FPM processes under dynamic mode.
Pm.min_spare_servers: The minimum number of PHP-FPM processes under dynamic mode.
Pm.max_spare_servers: The maximum number of PHP-FPM processes under dynamic mode.

Memory_limit: The amount of memory a process consumes

PHP-FPM maximum number of processes = (your total memory-memory required for system operation (approximately 200M) * 70% (reserved 30%))/Memory_limit
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There is a logic problem in the code, whether the loop is using a large array is not released.

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