On Tue, Jun 24, 2014 at 11:55 AM, Cagri Yalcin <[email protected]>
wrote:
> First of all, from your questions shall I assume the response time should
> not differ that much comparing to lock-based impls? We really need some
> best practices for Akka REST service actors, or
> at least some vision.
>
"Assume nothing. Bench everything."
>
> JMeter was running on the same machine. For JVM, in all experiments we
> used default maven-t7-plugin settings + CMS garbage collector.
>
What web framework are you using? What does "Sync REST" mean?
What _specific_ JVM settings, JVM version and operating system are you
using?
> Below is an Akka configuration that gives one of the best performances
> till now.
>
> default-dispatcher {
>
> fork-join-executor {
> parallelism-max = 100
>
This setting makes no sense (to me, unless you have more than 100 cores on
your machine)
> }
> throughput = 100
> }
>
> learning-core-dispatcher {
>
> type = Dispatcher
>
> executor = "fork-join-executor"
>
> fork-join-executor {
>
> parallelism-min = 8
>
> parallelism-factor = 3.0
>
> parallelism-max = 40
>
Do you have > 40 cores on your machine?
> }
>
> throughput = 100
> }
>
> default-mailbox {
> mailbox-type = "akka.dispatch.SingleConsumerOnlyUnboundedMailbox"
> }
>
>
Are you using _any_ blocking operations whatsoever?
> Regards,
>
> Cagri
>
>
>
> On Tuesday, June 24, 2014 11:33:10 AM UTC+2, √ wrote:
>
>> Also, what JVM parameters did you use?
>>
>>
>> On Tue, Jun 24, 2014 at 11:32 AM, √iktor Ҡlang <[email protected]>
>> wrote:
>>
>>> What is your bottleneck, what config did you use and did you run JMeter
>>> on the same machine or on a different machine?
>>>
>>>
>>> On Tue, Jun 24, 2014 at 11:30 AM, Cagri Yalcin <[email protected]>
>>> wrote:
>>>
>>>> Hi All,
>>>>
>>>> We've implemented an online learning/recommendation system adopting 2
>>>> approaches:
>>>> 1) Sync REST and learning components shielded with
>>>> ReentrantReadWriteLock's
>>>> 2) Sync REST and learning components deployed in Akka actors
>>>>
>>>> Throughout our stress tests using JMeter and several above 500K real
>>>> data, we analysed a huge set of configurations for Akka from
>>>> connector impl(component between akka actors and REST service), actor
>>>> architecture, dispatcher and mailbox settings perspectives.
>>>> Till now, best performance obtained via harnessing dedicated distinct
>>>> dispatchers with some (sub)optimized parameters for connector (fully
>>>> future-based and/or router+actor+future/based)
>>>> and core learning actors. In addition to this, using
>>>> SingleConsumerOnlyUnboundedMailbox as default mailbox type brings some
>>>> improvements.
>>>>
>>>> After extensive trials, comparing to ReentrantReadWriteLock-based
>>>> approach, what we observe is recommendation service response time is always
>>>> around 2 times
>>>> more in Akka-based impls, although Akka-based impls might give slightly
>>>> better throughput in some cases.
>>>>
>>>> My questions:
>>>>
>>>> 1) Considering response time, is Akka latency is inevitable comparing
>>>> to classical lock-based impls on top of a REST service? Any general
>>>> suggestion/guideline to improve
>>>> response time in Akka REST service actors?
>>>>
>>>> 2) Shall we "really" expect a better throughput if we use Async REST?
>>>>
>>>> Thanks a lot.
>>>>
>>>> Regards,
>>>>
>>>> Cagri Yalcin
>>>>
>>>> --
>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/
>>>> current/additional/faq.html
>>>> >>>>>>>>>> Search the archives: https://groups.google.com/
>>>> group/akka-user
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>>>
>>>
>>>
>>> --
>>> Cheers,
>>> √
>>>
>>
>>
>>
>> --
>> Cheers,
>> √
>>
> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
> >>>>>>>>>> Check the FAQ:
> http://doc.akka.io/docs/akka/current/additional/faq.html
> >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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--
Cheers,
√
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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