Poor performance of Java

Posted by Gabriel Landini on Dec 11, 2015; 12:46pm
URL: http://imagej.273.s1.nabble.com/Poor-performance-of-Java-tp5015218.html

Hi,
I noted that when dealing with several windows the performance of Java 1.8 is
appalling compared to 1.6, so I tested a few versions of Java under linux with
the following macro (just times the MRI Stack being converted to images).

run("MRI Stack (528K)");
t=getTime();
run("Stack to Images");
print (getTime()-t);
run("Images to Stack", "name=Stack title=[] use");

The difference is quite incredible, more than one order of magnitude (the
figures are the 'best' out of 3 runs):

// JavaVersion    Time(ms)   Batchmode(ms)
// 1.8 Oracle      7367         27
// 1.8 OpenJDK     7237         23
// 1.7 OpenJDK     7562         40
// 1.6 Oracle       554         32

Fortunately when the macro batch can be used, it avoids these delays, but when
running IJ interactively the poor performance is noticeable too.

I wonder why this performance glitch is there. Does this happen in Win and
Macs too?

Cheers

Gabriel

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