OpenJDK-8: Crypto performance is very slow on ARMv7

[Edward Nevill]

Hi Srinivas,

On Fri, 2017-01-27 at 15:48 +0530, Srinivasa Rao Ragolu wrote:
> Hi All,
> 
> I have ported openjdk-8-72b05(from Yocto) for armv7 . I am sharing
--------------------------^^^^^

I am not familiar with this, but my guess is that you are building a Zero image. IE. You are building the reference interpreter implementation.

I repeated your tests with a C1 build form armv7

With C1 I get

real	0m10.745s
user	0m10.925s
sys	0m0.235s

With -Xint I get

real	3m15.089s
user	3m14.550s
sys	0m0.280s

Which is the same ballpark that you are getting.

My guess is that yocto is picking up the sources from

http://hg.openjdk.java.net/jdk8u/jdk8u/

which does not have support for the C1 compiler.

To build a version with the C1 compiler you need to use the source at

http://hg.openjdk.java.net/aarch32-port/jdk8u/

I have put a prebuilt image at

http://camswl.com/images/jdk8-arm32-release.tgz

which may work on your system (or may not depending on your shared libs) if you wish to give it a try.

All the best,
Ed.


> code via link, which I have run to see the crypto performance and found it
> is very slow.
> 
> Code Location:
> https://drive.google.com/open?id=0BxeL64n1TNdJMlItSWpld1lIdjg
>