[Backgroundrb-devel] Need help with understanding how thread_pool/pool_size work

Raghu Srinivasan raghu.srinivasan at gmail.com
Wed Dec 31 17:43:35 EST 2008


No, I don't get any errors at all. Why is it mandatory for the method that I
want to run concurrently to receive an argument? In the real case of course
I'll be passing some equivalent of an ID but let me try with that and see...

On Wed, Dec 31, 2008 at 1:48 PM, hemant <gethemant at gmail.com> wrote:

> Could it be, because method that runs in thread expects an argument
> and you are not passing that argument when using thread_pool.defer()
> ??
>
> Did you not get any errors in log file?
>
>
>
> On Wed, Dec 31, 2008 at 10:45 PM, Raghu Srinivasan
> <raghu.srinivasan at gmail.com> wrote:
> > I'm on BDRB v 1.0.3 and am trying to understand how thread_pool and
> > pool_size work. I have to kick of dozens of jobs on schedule (each hour
> or
> > so). Other than the fact that they're all accessing the same DB there's
> no
> > reason for them to not run in parallel. thread_pool/pool_size should be
> the
> > way to go right?
> > I've put in sample code with its results below:
> > My Rails controller kicks off 5 jobs in a loop - each calling the
> > run_concurrent method in my foo worker. run_concurrent then calls
> > my_actual_method which just logger.infos a message with a time stamp and
> > sleeps for 5 seconds to simulate a long running job. I did this as
> > per http://backgroundrb.rubyforge.org/workers/#thread_pool Since I'm
> calling
> > this via a defer and have a pool size of 10, I expect to see that
> > my_actual_method actually gets called 5 times in quick succession (since
> the
> > pool size is greater than the # of calls). However I find that
> > run_concurrent doesn't even call my_actual_method. Here's the output from
> my
> > backgroundrb log when I go to http://mysite.com/some/foobar
> > Can someone help me understand what I'm doing wrong here?
> > Thanks,
> > Raghu
> > ====================================================
> > Rails controller code
> > class SomeController < ApplicationController
> >         def foobar
> >                 i = 0
> >                 while i < 5
> >                         worker = MiddleMan.worker(:foo_worker)
> >                         result = worker.run_concurrent(:job_key =>
> > random_string(10))
> >                         i += 1
> >                 end
> >                 render :text => 'all done at ' + Time.now.to_s
> >         end
> > end
> > ====================================================
> > Worker code
> > class FooWorker < BackgrounDRb::MetaWorker
> >         set_worker_name :foo_worker
> >         pool_size 10
> >         def create
> >                 # this method is called, when worker is loaded for the
> first
> > time
> >         end
> >         def run_concurrent(args)
> >                 logger.info "*** FOO_WORKER/RUN_CONCURRENT at " +
> > Time.now.to_s
> >                 thread_pool.defer(:my_actual_method)
> >         end
> >         def my_actual_method(args)
> >                 logger.info "*** FOO_WORKER/MY_ACTUAL_METHOD at " +
> > Time.now.to_s
> >                 sleep 5
> >         end
> > end
> > ====================================================
> > Here's the output
> > # Logfile created on Wed Dec 31 09:15:21 +0000 2008 by /
> > foo_worker started (pid:5087)
> > Schedules for worker loaded (pid:5087)
> > run_concurrent job_keydfvq5o4m0s (pid:5087)
> > *** FOO_WORKER/RUN_CONCURRENT at Wed Dec 31 09:15:26 +0000 2008
> (pid:5087)
> > run_concurrent job_keyy4tascam6k (pid:5087)
> > *** FOO_WORKER/RUN_CONCURRENT at Wed Dec 31 09:15:26 +0000 2008
> (pid:5087)
> > run_concurrent job_key8gw2eegeqs (pid:5087)
> > *** FOO_WORKER/RUN_CONCURRENT at Wed Dec 31 09:15:26 +0000 2008
> (pid:5087)
> > run_concurrent job_keyywb1oop73t (pid:5087)
> > *** FOO_WORKER/RUN_CONCURRENT at Wed Dec 31 09:15:26 +0000 2008
> (pid:5087)
> > run_concurrent job_key17gfkqtzjh (pid:5087)
> > *** FOO_WORKER/RUN_CONCURRENT at Wed Dec 31 09:15:26 +0000 2008
> (pid:5087)
> > ====================================================
> >
> > _______________________________________________
> > Backgroundrb-devel mailing list
> > Backgroundrb-devel at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/backgroundrb-devel
> >
>
>
>
> --
> Let them talk of their oriental summer climes of everlasting
> conservatories; give me the privilege of making my own summer with my
> own coals.
>
> http://gnufied.org
>
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