To provide further clarification, I came to these conculsions using the following method:
* On the test web server, I ran top, filtered by the user running php * I created a simple php test file in the test server's web directory with: <?php sleep(5); ?> * I used Apache's benchmark tool with the following arguments: ab -c 5 -n 5 http://test-server/test.php I observed that 5 processes appeared in top. * I set the FcgidMaxProcessesPerClass directive to 3, first in /etc/apache2/fcgid.conf, and then in /etc/apache2/sites-enabled/00-default, and then in both place. After each change, I reloaded apache (all processes in top were terminated), and then I re-ran the benchmark command and observed the number of processes that appeared in top. When the number of processes was 3, I concluded it was working as expected. When the number was 5, I concluded that it wasn't working properly.
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