[Spread-users] Performance

Jan Rickes jan.rickes at neofonie.de
Thu Aug 1 08:56:49 EDT 2002


Yair Amir wrote:
> 
> Are all of your machines the same speed and all of them empty?

they are almost equal...

> There are some tuning to make Spread run faster than the
> out-of-the-box performance, because the out-of-the-box is designed to
> work without many people contacting us. From your numbers, you have
> substantial decrease, so you probably have another problem - probably
> uneven machine power or too many losses on a machine, etc.

ok, we'll check this again.
how can we improve spread's performance in our 1-sender-n-receiver setup?

> 
> 3.16.2 has no problem to support 100 receivers but not if each of them
> is running on a different machine. For that you need a smarter design.

ok..
100 mashines will be the worst case.

> (or a more scalable version). I would also go with smaller messages in
> case you have a problem with IPC queues (assuming you are using IPC
> and not TCP for the local connections).
the messages will have the size of 10K bytes. 

> 
>     :) Yair.
> 

thanx for your quick reply...
~jan


> Jan> hello list!
> 
> Jan> we did some spflooder tests and we were increasing the number of hosts (linux).
> Jan> we realized, that spread seams to get slower by each added host.
> 
> Jan>         1.000 messages/100.000 bytes - time is averaged for all hosts
> 
> Jan>         freiburg -> okinava
> 
> Jan>         15.831 ms (48,19 Mbps)
> Jan>         15.251 ms (50,20 Mbps)
> Jan>         15.269 ms (49,96 Mbps)
> 
> Jan>         freiburg -> okinava, galway
> 
> Jan>         17.898 ms (42,62 Mbps)
> Jan>         18.123 ms (42,90 Mbps)
> Jan>         18.482 ms (41,28 Mbps)
> 
> Jan>         freiburg -> okinava, galway, qosqo
> 
> Jan>         21.143 ms (36,80 Mbps)
> Jan>         21.159 ms (36,50 Mbps)
> Jan>         20.365 ms (37,46 Mbps)
> 
> Jan>         freiburg -> okinava, galway, qosqo, teguise
> 
> Jan>         25.692 ms (29,69 Mbps)
> Jan>         25.663 ms (29,72 Mbps)
> Jan>         25.075 ms (30,42 Mbps)
> 
> Jan> we are using spread-src-3.16.2.tar and our spread.conf looks like this:
> 
> Jan>         Spread_Segment 224.100.100.224:6824 {
> Jan>              freiburg     172.27.27.27
> Jan>              okinava      172.27.27.28
> Jan>              galway       172.27.27.29
> Jan>              qosqo        172.27.27.30
> Jan>              tequise      172.27.27.31
> Jan>         }
> 
> Jan> but the main question is, how is it possible to increase spread's performace?
> Jan> we will have just *1* sender and up to *100* receivers in our scenario.
> 
> Jan> and another question, does spread nead a lot of resources(cpu, memory)?
> 
> Jan> regards, jan
> 
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