[Spread-users] Spread performance. Help !!!

[Massimo Feola]

Hi,
I am testing Spread performance on a 100 Mbits network.

In a experiment I run Spread on 4 computers; on 3 computers a receiving
application joins a group, on the remaining compunter an applications sends
1920 messages of 2000 bytes per second (constant rate of 30.72 Mbps!) to
that group.
All computer clocks are accurately syncronized. In this experiment I have
measured 2.5 ms of average message latency.

In another experiment I run Spread on 16 computers; on 15 computers a
receiving application joins a group, on the remaining compunter an
applications sends messages to that group. All computer clocks are
accurately syncronized. In this experiment I have measured the following
average message latency:

Msg size (bytes)    Msg/Sec     Average Latency     Rate
1000                62            20 ms             496  Kbps
1000                300           120 ms            2.4  Mbps
1000                620           250 ms            4.96 Mbps
1000                1500          550 ms            12   Mbps

>From the measures it results that increasing the computer number the average
latency grows up.
Did anyone experience my same problem?
Is this the normal Spread behaviour?
Is there a configuration error ?

I am using the following multicast Spread configuration:

Spread_Segment 224.0.55.54:31001 {
        WIXPWKS08               10.15.20.38
        wi2kserver07            10.15.20.124
        wixpwks05               10.15.20.29
        wi2kserver05            10.15.20.71
        nt40wks08               10.15.20.28
        NT40WKS11               10.15.20.31
        Wi2kwks05               10.15.20.237
        WI2KWKS11               10.15.20.241
        WIXPWKS02               10.15.20.238
        WIXPWKS01               10.15.20.165
        WI2KWKS03               10.15.20.228
        WIXPWKS03               10.15.20.35
        WI2KWKS10               10.15.20.41
        Wi2kwks07               10.15.20.200
        Wi2kwks08               10.15.20.47
        WI2KWKS01               10.15.20.165
}

The spmonitor ouput concerning the sending Spread follows.
Thanks,
Massimo.

=============================
Status at wi2kserver07  V 3.17. 3 <state 1, gstate 1> after 121 seconds :
Membership   :   15   procs in 1 segments, leader is WIXPWKS08
rounds   :     12612    tok_hurry :     34      memb change:       1
sent pack:    100008    recv pack :     84      retrans    :     961
u retrans:       961    s retrans :      0      b retrans  :       0
My_aru   :    100067    Aru       : 100067      Highest seq:  100067
Sessions :         2    Groups    :      2      Windows    :      21
Deliver M:    100015    Deliver Pk: 100067      Pers Window:       7
Delta Mes:    100015    Delta Pack: 100067      Delta sec  :     121
=============================


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