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0258.pdf as text as html | 96 comments | Create New Account
Comments belong to whoever posts them. Please notify us of inappropriate comments.
0258.pdf as text as html
Authored by: indyandy on Sunday, May 20 2012 @ 07:20 AM EDT
<b>From:</b> Andy McFadden<br>
<b>To:</b> Jason Parks; android-dalvik@google.com<br>
<b>Cc:</b> <br>
<b>Bcc:</b> <br>
<b>Sent:</b> 5/2/2007 6:16 PM<br>
<br>
<b>Subject:</b> [dalvik] Optimized stuff<br>
<br>
<br>
I have some early results on the field/method optimization stuff. I<br>
added it to the &quot;results3&quot; tab of the writely &quot;Android Java VM<br>
Performance&quot; doc. (The URL in my browser is 120 characters long, and<br>
I'm not sure that'll work for anyone else.)<br>
<br>
The optimizations convert constant pool indices in instance field<br>
get/put and virtual method calls to byte offsets and vtable indices,<br>
respectively. They allow us to skip a couple of lookups.<br>
<br>
Short version: the stuff that you'd expect to get faster got faster,<br>
by about 20%. Most tests remained the same, which wasn't the case on<br>
all runs (e.g. AddTest was hanging around 2000 rather than 1887 in<br>
some earlier trials).<br>
<br>
The Ackermann and FibonacciSiow tests got 13% and 7% slower. These<br>
use private methods and so use &quot;direct&quot; rather than virtual calls, so<br>
no improvement was expected. The other empty non-virtual method tests<br>
also got slower, but the implementations of those didn't change, so<br>
this is probably due to cache unhappiness. (I made one tweak that I<br>
need to go back and stare at ARM code for.)<br>
<br>
Some of the recent work on the Java libs showed up in the tests. The<br>
comparisons to Dalvik @19447 are meaningless on a few tests, e.g.<br>
HashMapContainsKey.<br>
<br>
-Andy<br& gt;
<br>
Android-Dalvik mailing list<br>
Android-Dalvik@google.com<br>
https://mailman.corp. google.com/mailman/listinfo/android-dalvik<br>
<br>

[ Reply to This | Parent | # ]

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