[Spread-users] Minimum size message

Jonathan Stanton jonathan at cnds.jhu.edu
Sat Apr 9 11:13:38 EDT 2005


The data you send in a SP_multicast call can be as small as 0 bytes (if 
all you want to send is a signal message with a particular mess_type 

The one special case for small messages actually improves performance
with them because it packs small messages into full-sized packets if you
send a lot of small messages at once. If you only send one small message
it is not delayed any more then it would be if it was full-sized (it is
not like NAGLE in TCP) and it is sent as soon as the flow-control allows 

Can you send more details about the performance problem you notice? For 
example, a description of the scenario or out put from spflooder or 
spmonitor showing the problem.



On Fri, Apr 08, 2005 at 12:39:57PM +0000, Gustavo Castro wrote:
> Hello,
> i´ve been running some tests and some of the times i´ve got are a bit 
> strange. Is there any minimum size for a spread message? I mean, if it´s 
> not big enough the data i´m sending, will spread wait for a timer to reach 
> zero, or will it send the message regardless the small size of the data?
> Thank you!
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Jonathan R. Stanton         jonathan at cs.jhu.edu
Dept. of Computer Science   
Johns Hopkins University    

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