Comparison of setting worker number between nginx and php-fpm

I would like to ask: nginx sets the number of worker to be calculated based on the number of cpu cores, but why does the pm.max_children of php-fpm prefer to be calculated based on memory?

Php
Nov.09,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3fd3d-2c4ad.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3fd3d-2c4ad.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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