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Posted to solr-user@lucene.apache.org by AHMET ARSLAN <io...@yahoo.com> on 2009/01/23 10:33:20 UTC
QTime in microsecond
Is there a way to get QTime in microsecond from solr?
I have small set of collection and my response time (QTime) is 0 or 1 milliseconds. I am running benchmark tests and I need more sensitive running times for comparision.
Thanks for your help.
RE: QTime in microsecond
Posted by Chris Hostetter <ho...@fucit.org>.
: The easiest way is to run maybe 100,000 or more queries and take an
: average. A single microsecond value for a query would be incredibly
: inaccurate.
that can be useful for doing the timing externally, if you're interested
in averaging over all X queries in a sequential batch, but it doesn't help
with things like replaying a live log (so you see acurate cache
behavior) and then trying to evaluate wether a subset of those queries
(the ones that use faceting maybe) are faster with config X then with
config Y .. for that you really want to be able to crunch the logs to
extract just hte requests you are interested in and then generate stats --
but as Ahmet points out, with millisecond resolution soemthing that takes
about 1 millisecond is hard to profile for possible improvements.
with the Solr code as written the best suggestion i can make is to see if
your servlet container can log it's requests at microsecond resolution --
that will include the ResponseWriter timing and the network overhead, but
that may better anyway.
A patch to change Solr to use System.nanoTime() for all the internal
timein would probably be pretty straight forward -- we'd just have to
consider wether it will screw people up if we change the format that gets
logged or included in teh response.
-Hoss
RE: QTime in microsecond
Posted by "Feak, Todd" <To...@smss.sony.com>.
The easiest way is to run maybe 100,000 or more queries and take an
average. A single microsecond value for a query would be incredibly
inaccurate.
-ToddFeak
-----Original Message-----
From: AHMET ARSLAN [mailto:iorixxx@yahoo.com]
Sent: Friday, January 23, 2009 1:33 AM
To: solr-user@lucene.apache.org
Subject: QTime in microsecond
Is there a way to get QTime in microsecond from solr?
I have small set of collection and my response time (QTime) is 0 or 1
milliseconds. I am running benchmark tests and I need more sensitive
running times for comparision.
Thanks for your help.