OpenJDK-8: Crypto performance is very slow on ARMv7

[Alex Kashchenko]

Hi Srinivas,

On 01/30/2017 07:02 AM, Srinivasa Rao Ragolu wrote:
> Hi Edward/All,
>
> I have tried port  http://hg.openjdk.java.net/aarch32-port/jdk8u/ to build
> openjdk-8 but no luck. Still crypto performance is slow.

Could you please post test results with -Xint (with JIT disabled) and 
without -Xint (to be sure that JIT is included into build, please see 
below)?

> and I am enabling zero build to build hotspot in my recipe.

If you'll build ZeroVM from aarch32-port, it won't be noticeably 
different from ZeroVM built from jdk8u repos (the ones you used before). 
To build AArch32 JIT you need to configure with:

--with-jvm-variants=client

Please make sure that in -version output there is:

OpenJDK *Client* VM ([...], *mixed* mode)

> Any other inputs that I could improve crypto performance?
>
> Thanks,
> Srinivas.
>
> On Fri, Jan 27, 2017 at 5:14 PM, Edward Nevill <edward.nevill at gmail.com>
> wrote:
>
>> 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
>>>
>>
>>


-- 
-Alex