Win2008r2 iis php is always w3wp.exe is always cpu50% what is the reason?

often w3wp.exe this process 50% CPU, and these events. Xiaobai asks for advice.
thought about changing linux, but felt some code numbers were complicated.

Nov.24,2021
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-64f5-1b34ca2-2bf36.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34ca2-2bf36.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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