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From Peter Lin <wool...@gmail.com>
Subject Re: Performance OpenJDK compared with SunJDK
Date Wed, 14 Dec 2011 13:26:53 GMT
I'll add a little bit more.

The difference between using currentTimeMillis versus nano time is
about 20-30% overhead regardless of the operating system or version of
JVM.

I've seen this first hand with Sun, IBM and JRockit on windows and linux.

OpenJDK is mostly the same as SunJDK, so there's very little
difference from a performance perspective. the SunJDK usually doesn't
include the experimental stuff that OpenJDK might have.

On Wed, Dec 14, 2011 at 7:41 AM, Deepak Goel <deicool@gmail.com> wrote:
> Hey
>
> Looking at your configuration, here is  a possible theory...
>
> Sun Microsystem (Sun JDK) was eaten by Oracle which runs on WINTEL
> platforms so the performance of SUN JDK is optimized on INTEL
> platforms. OpenJDK is meant for Linux platforms a late entry for INTEL
> into this game and hence low performance and high CPU peaks...
>
> Deepak
>
> On 12/14/11, Toni Menendez Lopez <tonimenen@gmail.com> wrote:
>> My loadserver is running in this server,
>>
>> Hardware :
>>
>> Proliant BL460C G1
>> 2xIntel Xeon @2,53Ghz (quad)
>> 32 GB of memory
>>
>> O.S :
>> RHEL5.4(Tikanga)
>>
>> I don´t have stats about that but I will collect in few days that I
>> will have again the server available, but my impression is that JMeter
>> is taking much more CPU with OpenJDK and is doing lots of big peaks,
>> seems problems with GC.
>>
>> But I will analyze it later, when my actual testing finished.
>>
>> Toni.
>>
>>
>> 2011/12/13, Deepak Goel <deicool@gmail.com>:
>>> Hey
>>>
>>> Looks like an evolution and quality problem..Sun JDK more evolved v/s
>>> OpenJDK
>>>
>>> What is the hardware? What is the performance difference? Stats please...
>>>
>>> Deepak
>>>
>>> On 12/13/11, Toni Menendez Lopez <tonimenen@gmail.com> wrote:
>>>> Hello all,
>>>>
>>>> I want to ask all of you on question !
>>>>
>>>> I am normally working with SunJDK for Jmeter and running in non-gui
>>>> mode, but now I want to migrate the openJDK ( OpenJDK 64-Bit Server VM
>>>> (build 1.6.0-b09, mixed mode)).
>>>>
>>>> I have executed the same test in SunJDK and OpenJDK and I have
>>>> experienced that Jmeter has worst performance sending the traffic with
>>>> OPenJDK that with SunJDK.
>>>>
>>>> Any of you have got some similar experience ?
>>>>
>>>> My O.S is RHEL5.4
>>>>
>>>> Best regards,
>>>>
>>>> Toni.
>>>>
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>>>>
>>>
>>>
>>> --
>>> Namaskara~Nalama~Guten Tag~Bonjour
>>>
>>>
>>>    --
>>> Keigu
>>>
>>> Deepak
>>> +91-9765089593
>>> deicool@gmail.com
>>> http://www.simtree.net
>>>
>>> Skype: thumsupdeicool
>>> Google talk: deicool
>>> Blog: http://loveandfearless.wordpress.com
>>> Facebook: http://www.facebook.com/deicool
>>>
>>> "Contribute to the world, environment and more :
>>> http://www.gridrepublic.org
>>> "
>>>
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>>>
>>
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>>
>
>
> --
> Namaskara~Nalama~Guten Tag~Bonjour
>
>
>   --
> Keigu
>
> Deepak
> +91-9765089593
> deicool@gmail.com
> http://www.simtree.net
>
> Skype: thumsupdeicool
> Google talk: deicool
> Blog: http://loveandfearless.wordpress.com
> Facebook: http://www.facebook.com/deicool
>
> "Contribute to the world, environment and more : http://www.gridrepublic.org
> "
>
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>

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