[omniORB] Big lag in method call

[Sylvain Gault]

On Wed, Jul 31, 2013 at 09:38:19PM +0200, Sylvain Gault wrote:
> Hi there.
> 
> I'm facing a problem right now. My application is a bit complex (it's a
> MapReduce implementation), I'll try to keep only the meaningful parts.
> 
> I have several processes, each running on distinct nodes.
> - One Master process.
> - M Mapper processes.
> - R Reducer processes.
> 
> For the example, let's say M = R = 10.
> 
> The Master controls everything.
> At some point, the Master will start 10 threads to perform 10 calls
> simultaneously to a method of one mapper process (named PM_1) to start
> the data transfers to the 10 reducers processes (named PR_1 to PR_10).
> 
> And the transfer method on PM_1 will call a method of PR_1 to actually
> ransfer its data.
> 
> The problem I have is that I apparently can't make another method call
> to PM_1 while those 10 transfers are running.
> When I try, I get a lag of several seconds and my method call only
> succeed when some of those 10 transfers are finished.
> 
> I first thought my data transfers were too bandwidth intensive and
> delayed my other short call. But given the statistics, It looks more
> like a limited number of parallel method calls.
> 
> 
> Any clue about this?
> 
> 
> Thanks.
> Regards,
> Sylvain Gault


Replying to myself: I found the configuration option
maxGIOPConnectionPerServer whose value is 5 by default. It was the
reason blocking my calls. A value of 1000 should be better. :]


Sylvain Gault