[Spread-users] Voice communication using Spread
rsln at wp.pl
Mon Feb 12 18:28:52 EST 2007
I'm developing voice communication system - with full duplex
and conference support for several users. It will work on local
LAN, not WAN.
>From the technical point of view, it will use GSM technologies: 8
kHz sampling, one channel, 16 bit samples. GSM compression
will be used: 160 samples (320 bytes) will be compressed to 33
bytes frame at 50Hz rate.
Architecture is simple - several clients (usually ~10) and single broker/switch application. I'm considering using Spread for this
(single daemon), since group communication system should
help to implement things like conferencing.
Did anyone do anything like this before ? I'm very interested in
any opinions about this. Any performance tuning using
parameters in membership.c ?
Conducting performance tests, I
noticed that under heavy load (sending a lot of messages to
group) Spread sometimes just closes connection. I found
similar discussion in the list archive, but it didn't help
(I read everything from the group). I've also read a lot about
Spread's blocking behaviour - we can use
select/poll/epoll/kqueue to detect socket readiness, but
I/O can block inside SP_receive or SP_multicast.
Does anyone know the reason Spread sometimes closes connection or blocks indefinitely under heavy load ?
I use 4.0.0 under Linux (SUSE 9.3, 10.2,).
I also found Spines (http://www.spines.org/) and read paper "An Overlay Architecture for High Quality VoIP Streams" (http://www.cnds.jhu.edu/pub/papers/voip_tmm_06.pdf).
Is Spines actively supported and developed ? Mailing
list does not seem to be very active.
Does it offer significant performance or other advantage over
Thanks for any help,
W stylu Joanny Brodzik.
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