What parameters are used to determine whether the concurrency of a single process in nodejs reaches the bottleneck?

multiple processes currently implemented by pm2 cluster, want to know whether to add instance.

Cluster pm2 node.js
Feb.24,2022

pressure test to see the response time

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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-64f5-1b385dc-2b886.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b385dc-2b886.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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