[Spread-users] Re: how to improve Spread performance

Ryan Caudy caudy at jhu.edu
Mon Sep 29 16:14:05 EDT 2003

I'm not sure what you mean by "blocks in one daemon."  Could you clarify 
by explaining the program behavior you're seeing in detail?  That is, 
does your client become disconnected from Spread, or does it just fail 
to return from calls to receive, or does something else happen?

Sometimes problems of this nature have to do with flow control at the 
application level - either it restricts the flow too much, or too 
little.  In addition, calls to SP_receive are blocking, but you can use 
select or other IO multiplexing tools on the mbox (which is a file 
descriptor, really) to get around this.


Sergio S wrote:
> Hi, I am using Spread but I have a problem. I am running an aplication 
> that has to run with several spread daemons. One Spread - one machine. I 
> have 6 machines.  I am developing a protocol that has to send 1000 files 
> of 16 KB. The problem is that when I run the aplication occurs that it 
> blocks in one daemon, but the daemon and the transaction in which it 
> blocks is random. I am sure the problem is in the daemons, but what is 
> the problem? I think it is a problem of timeouts or similar.  How can I 
> modify the timeouts? And what about  the params Window or Pers Window 
> with spmonitor?
> I have the binary distribution. Please answer. Thanks
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Ryan W. Caudy
Center for Networking and Distributed Systems
Department of Computer Science
Johns Hopkins University

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