Hi Prakhyat,
We are creating one actor system for entire app. Correct me if I am wrong, the
>> default dispatcher by default uses a fork-join thread pool with at least 8
>> threads.
>>
>> We need to support millions of requests from client. How to tune
>> dispatcher of actor system when using akka persistence/sharding/
>> clustering,
>>
>> 1. What is Recommended Type of Dispatcher
>>
>> Usually the ForkJoin pool is the best option for most of the workloads,
but this is something you need to measure. It is also a very good practice
to use separate dispatchers for various parts of the system. Then they
might be tuned individually.
>> 1. How to calculate threads per thread pool
>>
>> This is documented in the configuration file:
# The parallelism factor is used to determine thread pool size using the
# following formula: ceil(available processors * factor). Resulting size
# is then bounded by the parallelism-min and parallelism-max values.
>
>> 1. Do we need to consider cores?
>>
>> Yes, for example if you have only 8 cores then configuring 100 threads in
the pool makes usually no sense. If you have 8 cores then you might also
want to have at least 8 threads.
>
>> 1. Do we need to consider type of OS
>>
>> I don't have any benchmarks of Akka that compares different OSes on the
same machine. Also, this is probably workload dependent.
>
>> 1. Will JVM configuration matter
>>
>> Yes of course. Again, it is not easy to give any particular
configuration, these are all use case depedent.
> [Note:] Suggest any missed parameter in above list. Also how to specify
>> custom dispatcher configuration in app conf.
>>
>> Basically want to understand criteria's to decide performing dispatcher
>> per actor system.
>>
>> Is there any other configuration required to tune akka
>> persistence/cluster/shard kind of application for good performance.
>>
>> Also recommendations for tuning akka persistence/cluster/shard kind of
>> application would be great help.
>>
>
Apart from very generic advice we cannot really do much more without
detailed information about your application. If you want in-depth expert
advice tailored to your needs you might want to look into our consulting
offerings: http://typesafe.com/how/consulting
-Endre
>
>> -Prakhyat M M
>>
>> --
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>>>>>>>>>> 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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