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views:

103

answers:

2
+1  Q: 

Dalvik JIT compiler on Linux X86 or Mac build

Hello,

As I've heard from Google IO 2010 session, Dalvik JIT compiler just support ARM processor. Do this mean my own build of Android source on Linux X86 or Mac OS X can not support JIT compiler?

Should I use some target board with ARM processor to test Dalvik JIT compiler?

Thanks!

A: 

Hi,

I checked out in latest Android source tree, and there is no x86 codegen there. That means you can only execute JIT on ARM hardware.

ognian  2010-07-01 11:15:39
Thanks for the answer.But, how about QEMU? As Android Emulator runs on QEMU with virtual ARM mobile device so, I think it might be possible to test ARM JIT compiler from Linux and Mac build.Please see http://developer.android.com/guide/developing/tools/emulator.htmlThanks
Wonil  2010-07-01 14:22:08
Ah, now I understand what your're asking about - whether an Android image build on Linux or MacOS host will have JIT enabled. Sure it will - that's why cross compile toochains are for. You compile on one architecture to target another. And about the emulator distributed in the SDK - yes, it will execute JIT compiler. But that's not too useful in an emulated environment
ognian  2010-07-01 14:50:08
A: 

I checked about it by myself from Linux emulator. JIT is working with WITH_JIT=true build option. Also, JIT also useful even on the emulation mode. Linpack shows about 2x more performance gain with JIT.

Wonil  2010-10-26 09:40:36

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