[Spread-users] Tuning spread's performance for multicast

Dave Viner dviner at yahoo-inc.com
Fri Apr 4 16:46:46 EST 2003

I have a similar interest in using multicast to deliver files.  Have you
looked at fcast?

Its not based on Spread, but on MCL (MultiCast Library) which in turn is
uses the ALC/LCT protocol

Can anyone more knowledgable than I highlight the differences between Spread
and MCL?


-----Original Message-----
From: spread-users-admin at lists.spread.org
[mailto:spread-users-admin at lists.spread.org]On Behalf Of Guy Argo
Sent: Friday, April 04, 2003 12:38 PM
To: 'spread-users at lists.spread.org'
Subject: [Spread-users] Tuning spread's performance for multicast

I'm using Spread (under python) for a file delivery system.
Basically I want to deliver several large files to multiple destinations
simultaneously preferably multicasting them to minimize
network usage. I attached my crude little python test bed.

I got it to work and tested it on two machines on the same
subnet and the performance was underwhelming.
I achieved sustained throughput of 40KB/s for data sent using
multicast with RELIABLE_MESS and FIFO_MESS protocols.
The machines both have 100 Mb cards.
FTP achieved 600 KB/s.
Do you have any recommendations about how to tune
Spread to increase the performance?

I couldn't find anything in the doc. :(

Guy Argo <gargo at looksmart.net> ph +1 415 348 7683
Director, Production Engineering
LookSmart Ltd., 625 2nd St., SF CA 94107


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