When the pressure test is carried out by swoole udp server, the large flow leads to non-response.

100 task have been started (both 32 and 50 have been tried before). When the pressure test reaches a certain degree (QPS to more than 1K), the whole service stops working, and it is suspected that there is blocking. At this time, kill-TERM can not do it either. Has any boss encountered such a situation? what protection strategy is there

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Jul.16,2022

paste the reproduced minimum code, embarrassed

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-64f5-1bdc96a-3066a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdc96a-3066a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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