I would have uncommented any calls to $handle->blocking(0). The default mode is blocking, so that should work, and work even after forks.

Naturally that could make other problems if some other part of the code relies on non-blocking reads, but it would be only for testing the hypothesis

The timeout of 5 seconds is quite ok. If the loop only runs every 5 seconds you will never notice it. What the docs mean is that if you don't specify a TIMEOUT value, the timeout value will be infinity. But 5 seconds is practically infinity, if you look at cpu load

So uncomment or remove the blocking(0) calls, add print lines around your can_read calls to check if they wait for 5 seconds. If they still don't wait, check how many bytes they read out of the socket, maybe whatever code that writes to the socket is broken and spams the socket with data.

In reply to Re^3: Performance and CPU load: sysread, IO::Select and/or Storable::thaw by jethro
in thread Performance and CPU load: sysread, IO::Select and/or Storable::thaw by DBX

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