After mapping with Python mmap files under win7, the writing speed of large files has not moved, how to return a responsibility?

is exactly the same as useless time.
doesn"t it mean that file mapping in memory can speed up by 30%?

Dec.16,2021
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-64f5-1b3ef13-2bbcd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3ef13-2bbcd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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