[erlang-questions] run_erl and fsync

Damienuk Davis <>
Thu Jul 26 08:10:47 CEST 2012

Hi all,

In one of my projects I used run_erl to launch Erlang VM in daemon mode, rotate logs, etc.
But I discovered unexpected performance problem running production application with run_erl. Application caused high iowait.
After some investigation I found that run_erl does fsync on every log entry, causing disk IO load. Do we need fsync on every log entry.
Appreciate your valuable comments.

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