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From Brian Pinkerton <>
Subject Re: Question bout I/O monitoring
Date Fri, 11 Sep 2009 04:54:08 GMT
If you're on a Mac or Solaris, dtrace will tell you everything you  
want to know (and more.)  If you're not familiar with dtrace,  
iosnoop.d is a good start for this kind of measurement.

At Technorati, I used dtrace to build a trace file of all the read  
requests made by a big lucene app, recording timestamp, file, offset,  
and number of bytes read.  Among other things, the measurement led me  
to decrease the heap size of the JVM so that more of the index would  
fit in the file cache.


On Sep 10, 2009, at 9:39 PM, edwardyf wrote:

> Thanks for the reply, just checked the Lucid Gaze package, it only  
> collects
> the stats at
> function call level, no I/O stats

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