On Tue, 12 Apr 2011 19:10:09 +0200, Gregory Collins
<[email protected]> wrote:
On Tue, Apr 12, 2011 at 6:40 PM, Jon Kristensen
<[email protected]> wrote:
Hello Haskellers!
As I have now implemented everything that I could think of, I would
like to
ask the Haskell community to give some feedback on HLogger so that I can
continuing improving it. Some questions:
Do you have any general/architectural thoughts on things I might be
doing
wrong?
1) Use "Text" as the string type, not "String"
2) Re: SimpleLogger: writing to and flushing the log file upon
receiving each message is absolutely the wrong thing to do in
high-performance code. Each write() is a context switch into the
kernel, and doing it this way will kill your throughput (in messages
per second). What we do in our webserver (which relies on
high-throughput access logging) is to buffer messages to the log
channel in memory, and perform the actual writes in a separate worker
thread no more often than once every N seconds.
If you want to know what the last thing was that your application was
doing, before it crashed (e.g. at the customers site), you better write
every message immediately to disk.
Regards,
Henk-Jan van Tuyl
--
http://Van.Tuyl.eu/
http://members.chello.nl/hjgtuyl/tourdemonad.html
--
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