Apache error : Server ran out of threads to serve requests (Windows)

File name : error.log

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[Wed Jul 04 13:47:24.134888 2018] [mpm_winnt:error] [pid 7676:tid 2184] AH00326: Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting

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Description: This above error indicates, requests from users are not getting any thread to process further.

Solution: we have to increase a worker threads on “httpd-mpm.conf” file.

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<IfModule mpm_winnt_module>

                ThreadLimit         600

                ThreadsPerChild     600

                MaxRequestsPerChild 0

</IfModule>

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Means,1 parent process, exactly 1 child process with many threads, threads handle requests.

The MaxClients is optimal at 200 * the count of CPU cores for the prefork mpm  &  300 * the count of CPU cores for the workermpm.

NOTE :-

If you were not using this “httpd-mpm.conf “file on apache server.

By, default it will start with its, 64 worker threads.

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mpm_winnt:notice] [pid 8296:tid 372] AH00354: Child: Starting 64 worker threads.

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For more info Ref link :
https://httpd.apache.org/docs/2.4/mod/mpm_common.html
https://httpd.apache.org/docs/2.4/mod/worker.html

Thanks :