Hi,
do not ever optimize premature in java (and other jit languages like
javascript etc)!
if you have a bottleneck -> optimize that. and only that. but take care
how you compare statements.
be sure that you run some loops before. see the first comment of Aleksey
Shipilev here:
http://karussell.wordpress.com/2009/05/21/microbenchmarking-java-compare-algorithms/
jit is very clever in optimizing code: so code as simple (and 'stupid')
as possible to be understandle by jit ;-)
I.e. concentrate your time and effort on algorithms not on bytecode.
Regards,
Peter.
hi all
we found function call in java will cost much time. e.g replacing
Math.min with a<b?a:b will make it faster. Another example is lessThan
in PriorityQueue when use Collector to gather top K documents. Yes,
use function and subclass make it easy to maintain and extend. in
C/C++, we can use inline fuction to optimize. What about java? I see
many codes in lucene also inline many codes mannully.
such as implmented hash map in processDocument,
SegmentTermDocs.read "// manually inlined call to next() for speed".
Is there any compiler option for inline in java? Or we may hardcode
something for time consuming tasks
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