I can confirm this takes ~ 20% of an overall Indexing operation (see attached link from YourKit).

http://people.apache.org/~psmith/luceneYourkit.jpg

Mind you, the whole "signalling via IOException" in the FastCharStream is a way bigger overhead, although I agree much harder to fix.

Paul Smith

On 17/11/2005, at 7:21 AM, Yonik Seeley wrote:

Float.floatToRawIntBits (in Java1.4) gives the raw float bits without
normalization (like *(int*)&floatvar would in C).  Since it doesn't do
normalization of NaN values, it's faster (and hopefully optimized to a
simple inline machine instruction by the JVM).

On my Pentium4, using floatToRawIntBits is over 5 times as fast as
floatToIntBits.
That can really add up in something like Similarity.floatToByte() for
encoding norms, especially if used as a way to compress an array of
float during query time as suggested by Doug.

-Yonik
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