1:29 p.m.
ignacio marrero [https://community.jboss.org/people/ignacio.marrero] created the
discussion
"¿Number of threads of JCA WorkManager in AS7?"
To view the discussion, visit: https://community.jboss.org/message/778194#778194
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We are doing some performance tests of our application (REST API with Mysql) and find that
with independency of the concurrency (no matters if we have 50 clients or only 3) the JCA
subsystem uses only 2 threads. This brings into a bottleneck in the case of high
concurrency as many DB requests are enqueued within the same JCA worker.
Our configuration is:
* CentOS 6, X64_86
* AS7.1
* 2 stateless balanced jboss nodes
* Standalone.xml (please refer to https://gist.github.com/4140899
https://gist.github.com/4140899)
* NDB MySQL cluster with two nodes and maxconnections=150 per node
¿how can i increase de number of JCA threads? ¿why iraonjacamar instantiates only 2
threads?
any help will be apreciated
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7:32 a.m.
New subject: [IronJacamar] - Re: ¿Number of threads of JCA WorkManager in AS7?
Jesper Pedersen [https://community.jboss.org/people/jesper.pedersen] created the
discussion
"Re: ¿Number of threads of JCA WorkManager in AS7?"
To view the discussion, visit: https://community.jboss.org/message/778344#778344
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The WorkManager has nothing to do with datasources - see <pool> / <xa-pool> -
http://docs.jboss.org/ironjacamar/userguide/1.0/en-US/html/deployment.htm...
http://docs.jboss.org/ironjacamar/userguide/1.0/en-US/html/deployment.htm...
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7:06 a.m.
New subject: [IronJacamar] - Re: ¿Number of threads of JCA WorkManager in AS7?
ignacio marrero [https://community.jboss.org/people/ignacio.marrero] created the
discussion
"Re: ¿Number of threads of JCA WorkManager in AS7?"
To view the discussion, visit: https://community.jboss.org/message/778865#778865
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Hi Jesper,
Unfortunately we have no success changing pool / xa-pool.
You are rigth, our problem aren't workers but we can't understand JCA behaviour,
so we can't solve the bottleneck.
I would like to explain better the tests we are doing:
* We are using JMeter to stress our API with 50 threads and 30 iterations with 0 seconds
"Ramp-up period"
* The tests are performed from a single host located outside the data center against our
public ip
* Each thread does 5 HTTP requests
* Each HTTP request makes a few DB calls
* Due to an unknown reason our jboss only uses two "JCA threads" to enqueue all
the DB requests of 150 HTTP threads
* This is a fragment of one of the two "JCA threads" (
https://gist.github.com/4161046 https://gist.github.com/4161046)
Thank you in advance
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6:09 a.m.
New subject: [IronJacamar] - Re: ¿Number of threads of JCA WorkManager in AS7?
Gunnar Hilling [https://community.jboss.org/people/ghilling] created the discussion
"Re: ¿Number of threads of JCA WorkManager in AS7?"
To view the discussion, visit: https://community.jboss.org/message/793486#793486
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Hi Ignacio,
Your application won't use "jca threads" to handle the db requests. These
are handled by your application threads.
Example:
* Connection pool size is 10.
* You have a maximum of 20 http connections.
* Handling of an http requests will involve getting a connections from the pool.
If you fire up JMeter, a maxiumum of 20 connections will be allowed, each connection will
try to get a DB connection from the pool and is blocked while none is available.
Eventually a connection will become available and the blocked thread can continue.
So typically you will have 10 of your 20 http threads blocked waiting for a db connections
from the pool.
The blocked threads are those named "http--0.0.0.0-8080-"x ...
Hope that helps.
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4144
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3 comments
3 participants
participants (3)
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Gunnar Hilling -
ignacio marrero
-
Jesper Pedersen