Test ab fails after 100 connections with many workers tarantool

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Hi, trying to test with ab on tarantool I noticed that if I put only one worker in the openresty configuration the test doesn't fail instead if I put more workers, having more CPUs, the test fails after 100,000 connections. Can you give me an explanation?

The report names no source files or tests and does not provide software versions or a standalone reproducer. Start by reproducing the ab test against tarantool with one worker and then multiple workers, while checking nginx's error.log with debugging enabled. Done means the failure after 100,000 connections is reproducible and its cause and expected behavior are documented.