<br><font size=2 face="sans-serif">>> </font><tt><font size=2>And
I totally agree with Ramki that just showing averages might not be very
productive and you'll be better off showing distribution statistics.</font></tt>
<br><font size=2 face="sans-serif">I do have distributions (I output a
centile distribution basically) but am quoting averages because </font>
<br>
<br><font size=2 face="sans-serif">a) I'm not sure what an easy way to
distribute this information is over a mailing list, and </font>
<br><font size=2 face="sans-serif">b) there is a consistent pattern around
the quoted mean</font>
<br>
<br><font size=2 face="sans-serif">with respect to b), the distribution
for each looks very much the same except the average is shifted... it's
reasonably tight around the mean given the hardware we run on (typically
+/- 100 micros for 90% then a bit of a tail but not tragic if no STW pauses).</font>
<br>
<br><font size=2 face="sans-serif">>> </font><tt><font size=2>To
increase the heap region size you can use the G1HeapRegionSize=N parameter.
Currently, the allowed range is between 1m and 32m.</font></tt>
<br><font size=2 face="sans-serif">is there a guide to G1 tuning anywhere?
I haven't come across one hence why I've used default values (and perhaps
why we appear unable to get it as fast as cms).</font>
<br>
<br><font size=2 face="sans-serif">>> </font><tt><font size=2>modulo
the caveats about NUMA-allocator anti-patterns above.</font></tt>
<br><font size=2 face="sans-serif">I intend to change our main case that
shows no gain with a NUMA-allocator so that the longer lived object is
created in the thread that uses it so will repeat the bench at that point.</font>
<br>
<br><font size=2 face="sans-serif">Cheers</font>
<br><font size=2 face="sans-serif">Matt</font>
<br><font size=2 face="sans-serif"><br>
Matt Khan<br>
--------------------------------------------------<br>
GFFX Auto Trading<br>
Deutsche Bank, London</font>
<br>
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