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<P><FONT size=2>Hi,<BR>I am testing Spread performance on a 100 Mbits
network.<BR><BR>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.<BR>All computer clocks are accurately syncronized. In this
experiment I have measured 2.5 ms of average message latency.<BR><BR>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:<BR><BR></FONT><FONT size=2><FONT
face=Courier>Msg size (bytes) Msg/Sec
Average Latency
Rate<BR>1000
62 20
ms
496
Kbps<BR>1000
300 120
ms 2.4
Mbps<BR>1000
620 250
ms 4.96
Mbps<BR>1000
1500 550
ms
12 Mbps<BR></FONT><BR>From the measures it results that increasing
the computer number the average latency grows up.<BR>Did anyone experience my
same problem?<BR>Is this the normal Spread behaviour?<BR>Is there a
configuration error ?<BR><BR>I am using the following multicast Spread
configuration:<BR><BR></FONT><FONT size=2><FONT face=Courier>Spread_Segment
224.0.55.54:31001 {<BR>
WIXPWKS08
10.15.20.38<BR>
wi2kserver07
10.15.20.124<BR>
wixpwks05
10.15.20.29<BR>
wi2kserver05
10.15.20.71<BR>
nt40wks08
10.15.20.28<BR>
NT40WKS11
10.15.20.31<BR>
Wi2kwks05
10.15.20.237<BR>
WI2KWKS11
10.15.20.241<BR>
WIXPWKS02
10.15.20.238<BR>
WIXPWKS01
10.15.20.165<BR>
WI2KWKS03
10.15.20.228<BR>
WIXPWKS03
10.15.20.35<BR>
WI2KWKS10
10.15.20.41<BR>
Wi2kwks07
10.15.20.200<BR>
Wi2kwks08
10.15.20.47<BR>
WI2KWKS01
10.15.20.165<BR>}<BR></FONT><BR>The spmonitor ouput concerning the sending
Spread follows.<BR>Thanks,<BR>Massimo.<BR><BR><FONT
face=Courier>=============================<BR>Status at wi2kserver07 V
3.17. 3 <state 1, gstate 1> after 121 seconds :<BR>Membership
: 15 procs in 1 segments, leader is
WIXPWKS08<BR>rounds :
12612 tok_hurry :
34 memb change:
1<BR>sent pack: 100008 recv pack
: 84 retrans
: 961<BR>u retrans:
961 s retrans :
0 b retrans :
0<BR>My_aru : 100067
Aru : 100067
Highest seq: 100067<BR>Sessions :
2 Groups
: 2 Windows
: 21<BR>Deliver M:
100015 Deliver Pk: 100067 Pers
Window: 7<BR>Delta Mes:
100015 Delta Pack: 100067 Delta
sec :
121<BR>=============================<BR></FONT><BR></FONT></P></BODY></HTML>