Quick Answer
PHP-FPM ultra-high concurrency: use pm=static with workers = CPU cores x 2-4 for CPU-bound. For I/O-bound use more workers. Reduce process memory footprint with Opcache preloading. Use Unix sockets instead of TCP for loopback connections. Add request queue buffering at Nginx level. Monitor with status page. Consider Swoole for true async if traditional FPM hits limits.
Answer
Tune pm settings based on memory per worker and CPU. Use dynamic or ondemand mode, set pm.max_children appropriately, and use pm.max_requests to recycle workers. Analyze slow logs and worker queue saturation for optimal concurrency.
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Verified Answer
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