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I am trying to diagnose bottleneck for a apache(v 2.0.52) server using strace.

It looks like call to poll is slowing the process. Below is one example

poll([{fd=10, events=POLLIN}], 1, 120000) = 0 <119.996719>

ls -l /proc/pid/fd returns

10 -> socket:[somenumber]

Any clues?


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That's expected: poll() waits for something to happen, the third argument is the millisecond timeout, nothing happened after ~120s...

In my experience logging, access control are DNS lookups are common causes of performance problems.

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