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From bxqdev <bxq...@themailbay.com>
Subject Re: Connectors: Http11Protocol vs. Http11NioProtocol
Date Fri, 27 Jan 2012 23:52:34 GMT


On 1/28/2012 3:41 AM, Pid wrote:
> On 27/01/2012 23:35, bxqdev wrote:
>>
>>
>> On 1/28/2012 3:16 AM, Pid wrote:
>>> On 27/01/2012 22:51, bxqdev wrote:
>>>>
>>>>
>>>> On 1/28/2012 2:39 AM, Pid wrote:
>>>>> On 27/01/2012 21:35, bxqdev wrote:
>>>>>>
>>>>>>
>>>>>> On 1/28/2012 1:16 AM, Pid wrote:
>>>>>>> On 27/01/2012 21:06, bxqdev wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>> On 1/27/2012 8:27 PM, Pid wrote:
>>>>>>>>> On 27/01/2012 14:53, bxqdev wrote:
>>>>>>>>>> Hello, Developers!
>>>>>>>>>>
>>>>>>>>>> 1. What are the premises to use either
>>>>>>>>>> apache.coyote.http11.Http11NioProtocol or
>>>>>>>>>> org.apache.coyote.http11.Http11NioProtocol connectors?
>>>>>>>>>
>>>>>>>>> Eh?  Is that what you really mean?
>>>>>>>>
>>>>>>>> i mean what are the reasons to use either connector variant.
>>>>>>>
>>>>>>> NIO can handle more concurrent connections.
>>>>>>
>>>>>> yeah, that's why i use the nio connector.
>>>>>>
>>>>>>>
>>>>>>>>>> 2. Do i get any advantages if i use Sync Servlet
Api with
>>>>>>>>>> Http11NioProtocol connector or do i have to use Async
Servlet Api
>>>>>>>>>> to get
>>>>>>>>>> the advantages?
>>>>>>>>>
>>>>>>>>> What advantages are you looking for?  How much traffic
are you
>>>>>>>>> expecting
>>>>>>>>> to handle?
>>>>>>>>
>>>>>>>> a lot of. i'm looking for advantages in throughput and performance,
>>>>>>>> for
>>>>>>>> example.
>>>>>>>
>>>>>>> How much is a lot?
>>>>>>
>>>>>> 10'000/sec
>>>>>>
>>>>>>> How many Tomcats are you running?
>>>>>>
>>>>>> 1
>>>>>>
>>>>>>> How much RAM/CPU per server etc?
>>>>>>
>>>>>> 8GB/Xeon
>>>>>
>>>>> Only 1 CPU?
>>>>
>>>> yes, but it's multicore.
>>>>
>>>>>
>>>>>>> How big is the average response?
>>>>>>
>>>>>> 300Kb
>>>>>
>>>>> So you want to send 300k * 10000 / sec?  Isn't that just under 3Gb per
>>>>> second?
>>>>
>>>> actually when i measured it was less than 1Gb/sec
>>>
>>> I see.  Did you identify where the bottleneck was?
>>
>> well, we are getting too far from the subject.
>> can you make up 3 cases when to use 3 combinations of connector+servlet api
>> 1. bio connector + async servlet
>> 2. nio connector + sync servlet
>> 3. nio connector + async servlet
>> i mean in which theoretical case each combination of connector+servlet
>> api is the best choice?
>
> Nope.

it's not that hard, when you know the subject, but i guess, unfortunately, it's not the case
:)

>
>>>>>>>>>> 3. How do i choose which one to use in any particular
case?
>>>>>>>>>
>>>>>>>>> First, don't prematurely optimise.  Have you tested your
>>>>>>>>> application
>>>>>>>>> yet?
>>>>>>>>
>>>>>>>> yes, i need a better throughput and performance.
>>>>>>>
>>>>>>> Please provide details.
>>>>>>>
>>>>>>> How have you optimised your application so far, or are you hoping
to
>>>>>>> optimise Tomcat first?
>>>>>>
>>>>>> webapp is optimized, i want to optimize tomcat.
>>>>>
>>>>> How did you optimise your webapp for 3Gb/sec with only 8Gb of RAM?
>>>>
>>>> i wrote nice code. it's serving 1Gb/sec with 8Gb of RAM. are you
>>>> surprised?
>>>
>>> No, I'm curious*.  Of course you mean<   8Gb for the JVM process, as the
>>> OS etc consumes ~1.5Gb usually, you want to leave a bit of space too, so
>>> usually end up aiming for 4Gb for the JVM unless you want to use swap as
>>> well.
>>>
>>> Are you using swap to improve your memory performance?
>>
>> is it some kind of sarcasm?
>
> Yep.

ok, very funny.

>
>>>>> In 3 seconds you'll have produced more data than you have RAM, how have
>>>>> you optimised the garbage collector for this?
>>>>
>>>> we use a custom garbage collector.
>>>
>>> Interesting.  Of your own design?
>>
>> yes, we're going to opensource it soon. stay tuned.
>
> I shall.

what garbage collector do you use?

>
>
> p
>
>>> I was going to ask whether you had a 64bit JVM and whether you found
>>> CompressedOops to be a performance improvement or not?
>>
>> why would we use 32bit OS/JVM on 8Gb server?
>> actually we don't have any problems to solve.
>> my question is more theoretical.
>>
>>> * There's a few meanings to that, André, I know which one I meant.
>>>
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>>>
>>>
>>
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>
>

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