https://bz.apache.org/bugzilla/show_bug.cgi?id=64157
Bug ID: 64157
Summary: Tomcat 7 performance: enable tomcat to pre-start pool
of min spare threads optionally
Product: Tomcat 7
Version: trunk
Hardware: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: torres.y...@broadcom.com
Target Milestone: ---
Hi Tomcat,
During our performance testing, we found out that tomcat 7 made a mistake on
preStartMinSpareThread.
In Tomcat 6, tomcat doesn't pre-start and maintain a pool of min spare threads,
instead thread pool increased as requests come in.
In Tomcat 7. tomcat made a mistake and pre-start and maintain a pool of min
spare threads, which impacts the performance.
In details:
- In 2010, Tomcat added this commit to OPTIONALLY prestart the core numbers of
workers
https://github.com/apache/tomcat/commit/26fe8127fd51b9b09a8abefa43d63f1f02960e50#diff-aee166200d5b05354b92c2ba73a758f9
And defect track in Bugzila:
https://bz.apache.org/bugzilla/show_bug.cgi?id=43642
- In 2017, Tomcat added this commit to ALWAYS prestart, ignoring the previous
commit, probably by mistake
https://github.com/apache/tomcat/commit/b0e35f94f5dbb24079d29afe0958a4ee02319927#diff-baa9c50854087e10ddd02bd58f546f2a
This change contribute to tomcat performance degradation, and it would improved
tomcat 7 if we are able to optionally start the min spare threads.
Here we attached a patch to solve this problem.
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