xinyiZzz opened a new pull request, #19164: URL: https://github.com/apache/doris/pull/19164
# Proposed changes Issue Number: close #xxx ## Problem summary Recently, it has been noticed that mmap()+munmap() takes more time than jemalloc in performance testing, so the mmap threshold can be configured and increased to 128M by default. This is a conservative adjustment. It may not be possible to directly replace mmap() with jemalloc. because for example, jemalloc cannot mremap, which will be slower in some heavy load scenarios, and jemalloc has memory fragmentation. Clickhouse has found the same problem and considered using jemalloc instead of mmap(), but without success. refer to [#](https://github.com/ClickHouse/ClickHouse/pull/46457) ## Checklist(Required) * [ ] Does it affect the original behavior * [ ] Has unit tests been added * [ ] Has document been added or modified * [ ] Does it need to update dependencies * [ ] Is this PR support rollback (If NO, please explain WHY) ## Further comments If this is a relatively large or complex change, kick off the discussion at [d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you chose the solution you did and what alternatives you considered, etc... -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
