From: Dave Bass <davebass@...>
Date: 2008-05-31T20:21:29+09:00
Subject: Re: Unbuffered output with Logger (newbie question)

Eric LIn wrote:
> My suspicion is I'm not instantiating File correctly.  Perhaps there
> is an option for unbuffered output?

File is a subclass of IO, and IO has a flush method, which File 
inherits. So you can do file.flush after each write to bypass Ruby's 
buffering.

Pickaxe p. 509 says:

"io.flush -- Flushes any buffered data within io to the underlying 
operating system (note that this is Ruby internal buffering only; the OS 
may buffer the data as well)."

So you could try flushing the log file after each log.info call. I 
suspect this means subclassing Logger or modifying something within 
Logger; maybe someone more experienced could suggest how to do this.

You're still at the mercy of the OS's buffering, which is additional to 
Ruby's.
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