[Spread-users] Performance Question

Ryan Caudy rcaudy at gmail.com
Tue Dec 14 19:30:15 EST 2004

Is frln06 separated from the others by a router or switch?  My reason
for guessing this is the different IP address range it belongs to.  If
so, this may be your problem -- Spread sends mutlicast messages with a
TTL of 1.  You may need to use two Spread_Segments to avoid this
problem.  Are the other daemons even finding frln06?

On a non-lossy network, I would expect to see slightly higher latency
for messages when comparing Spread and TCP/IP.  Note that, on the
ring, RELIABLE messages are treated the same as FIFO messages.

Let me know if this helps.


On Tue, 14 Dec 2004 10:45:59 -0800 (PST), Mike Perik
<michaelperik at yahoo.com> wrote:
> I've been working on evaluating the performance of
> Spread for distributing a Market Data Feed.  I'm
> subscribing to about 33 high volume stocks and
> broadcasting the information over a 9 node spread
> network.  One publisher and 9 clients receiving the
> data.
> I'm comparing the times the information is received on
> the spread system to times taken for a 9 tcp/ip
> client/server setup.
> I'm running both systems on the same machines at the
> same time so I can take the log files and strip out
> the common period of time they ran to do the
> comparison of timestamps.
> I'm sending the Spread messages as RELIABLE.
> I'm seeing on average that the Spread messages are
> about .7 secs behind the tcp/ip clients.
> Has anyone else done similiar tests?
> Does this sound right?
> I'm a littled surprised by results.
> I am seeing a consistant difference in the times
> between the first tcp/ip client and the last tcp/ip
> client which you would expect.
> Could the machine frln06 be causing a problem?
> The client on that machine does not receive any data.
> I've got my network guy looking into why that is
> happening.  I believe the router is not configured
> properly.
> Spread_Segment {
>         frln09        
>         frln11        
>         frln22        
>         frln03        
>         frln16        
>         frln18        
>         wango         
>         frln06        
>         gamma         
>         nero          
> }
> Thanks,
> Mike
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