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From Deepak Goel <deic...@gmail.com>
Subject Re: Performance OpenJDK compared with SunJDK
Date Wed, 14 Dec 2011 13:59:57 GMT
@Peter

can you please combine your two mails and restate what you are trying
to point out. Seems they mean different things:

----------------------
Getting currentTimeMillis and nano time has a higher overhead on "linux
versus windows"

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

Also can you please mention exactly what hardware have you measured
your results for?

On 12/14/11, Peter Lin <woolfel@gmail.com> wrote:
> 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.
>>>>>
>>>>> ---------------------------------------------------------------------
>>>>> To unsubscribe, e-mail: user-unsubscribe@jmeter.apache.org
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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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>> For additional commands, e-mail: user-help@jmeter.apache.org
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@jmeter.apache.org
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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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