[Spread-users] Spread segments w/o active daemons cause delays in other segments

[Ryan Caudy]

I can't think of anything that would cause this performance drop. 
Just out of curiosity, can you try adding a third daemon to the first
segment in the configuration file, removing the second segment, and
repeating the tests with the same two daemons up and participating?

Cheers,
Ryan


On Thu, 17 Mar 2005 23:37:39 -0500, Dmitry Korsun <dkorsu at corp.idt.net> wrote:
> Hi all.
>  I am relatively new to Spread and have stumbled across a problem that I
> need help with resolving. Apparently adding a second Spread segment
> without any spread daemons causes a big performance drop in the first
> segment, even when clients are connecting to a member of the first
> segment locally.
> 
> Here are the scenarios:
> 
> I was getting really good performance results when using a single
> segment configuration with spread daemons runing on BOTH machines in the
> segment:
> #
> Spread_Segment 172.16.202.255:4803 {
>        DevLinuxPro     172.16.202.64
>        StarDev1 172.16.202.77
> }
> #
> Performance was tested by using spflooder utility and connecting to the
> spread daemon LOCALLY:
> devlinuxpro$ time spflooder -u ya -m 10000 -b 100 -s 4803 at devlinuxpro
> flooder: connecting to 4803 at devlinuxpro.mis.idt.net
> flooder: starting  multicast of 10000 messages, 100 bytes each.
> flooder: completed  10000 messages of 100 bytes
> flooder: completed multicast of 10000 messages, 100 bytes each.
> real    0m0.559s
> user    0m0.020s
> sys     0m0.240s
> 
> This yields ~20000 messages/sec
> 
> Once a second segment was configured but no daemon started on the new
> segment machine, performance dropped dramatically:
> #
> Spread_Segment 169.132.9.255:4803 {
>        dev_1       169.132.9.113
> }
> #
> Again, performance was tested LOCALLY on the machine that is part of the
> first segment:
> devlinuxpro$ time spflooder -u ya -m 10000 -b 100 -s
> 4803 at devlinuxpro.mis.idt.net
> flooder: connecting to 4803 at devlinuxpro.mis.idt.net
> flooder: starting  multicast of 10000 messages, 100 bytes each.
> flooder: completed multicast of 10000 messages, 100 bytes each.
> real    0m25.543s
> user    0m0.060s
> sys     0m0.960s
> Now we are down to ~400 messages/sec.
> 
> I about to test performance once a spread daemon is brought up on the
> second segment.
> 
> Question - why does this addition of a segment without a daemon process
> affect performance on a entirely different segment, especially the LOCAL
> performance.  Is there a way to configure SPREAD so that different
> segments do not affect each other's performance ?
> 
> Thank you in advance,
> Dmitry Korsun
> 
> --
> ::::::::::::...... .  .   .
> :: Dmitry Korsun
> :: x4095
> :: dmitry.korsun at corp.idt.net
> :::::::::::::::::....... .   .       .
> 
> --
> ::::::::::::...... .  .   .
> :: Dmitry Korsun
> :: x4095
> :: dmitry.korsun at corp.idt.net
> :::::::::::::::::....... .   .       .
> 
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