Setting the FPM max requests param to a low number might help (default of 500 is fine).<div><br></div><div>I've found when benchmarking that the PHP processes don't release memory very well and have a tendency to grow bigger and bigger, while getting slower and taking longer to process requests in the process.</div>
<div><br></div><div>After changing this setting I was able to push several 100,000 requests at the server and maintain a consistent response time and memory usage.</div>