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    Resolved PHP struggling under heavy load - "failed to prepare the stderr pipe: Too many open files (24)"

    We've noticed that PHP repeatedly gives this error when our server is under heavy load. We've experienced this during peak live traffic, and also load testing on a clone of the server. In /var/log/plesk-php56-fpm/error.log: [07-May-2020 05:45:20] ERROR: failed to prepare the stderr pipe: Too...
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