[Spread-users] Spread Performance Questions

[John Lane Schultz]

Are these results consistently repeatable?  What you are seeing definitely 
should not be occurring!

In a busy system, safe messages typically should have latency roughly twice as 
high as lower ordered packets.  Since you are doing a ping-pong test, I would 
expect the time to be nearly twice as high as for the lower order packets.

Cheers!

Daniel Marques wrote:
> Hi All,
> 
> I'm running some quickie experiments with Spread and was wondering if
> anyone could help explain some performance results I'm seeing.
> 
> Spread is configured as follows:
> 
> Spread_Segment  192.168.143.255:4803 {
>     a 192.168.143.86
>     b 192.168.143.56
> }
> 
> There are two Spread processes running, the 'server' on machine a, and
> the 'client' on machine b.  I'm running a ping-pong test: the client
> sends a message to the server, the server receives that message and
> responds back to the client.  They do this for 1024 messages, each 1KB
> in size.
> 
> I'm seeing a huge disparity in the time of SAFE_MESS type messages and
> the others:
> 
> UNRELIABLE_MESS: elapsed time is 2 second 562000 miliseconds
> RELIABLE_MESS: elapsed time is 2 second 547000 miliseconds
> FIFO_MESS: elapsed time is 2 second 547000 miliseconds
> CAUSAL_MESS: elapsed time is 2 second 531000 miliseconds
> AGREED_MESS: elapsed time is 2 second 547000 miliseconds
> SAFE_MESS : elapsed time is 274 second 141000 miliseconds
> 
> Can anyone explain why it is so much slower?
> 
> Thanks.
> 
> Dan
> 
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-- 
John Schultz
Spread Concepts LLC
Phn: 443 838 2200
Fax: 301 560 8875