[Spread-users] how to tune spread?

[Jan Rickes]

hello list,

again we did some tests with "out-of-the-box" spread-src-3.16.2 
and we are still having a "substantial decrease" of performance.

is that decrease a regular behavior of spread?
or is it possible to tune spread's performace in a 1-sender-n-receiver scenario?
and if so, how can we do it?

regards, jan




1.000 messages each 100.000 Bytes ..i now, we should send smaller messages ;)

sender -> receiver1
 17648ms (43.23 Mbps) 
 17705ms (43.90 Mbps)
 17629ms (43.27 Mbps)

sender -> receiver1, receiver2
 26115ms (29.21 Mbps)
 26632ms (28.64 Mbps)
 27027ms (28.22 Mbps)

sender -> receiver1, receiver2, receiver3
 31333ms (24.34 Mbps)
 31686ms (24.70 Mbps)
 32121ms (23.75 Mbps)

sender -> receiver1, receiver2, receiver3, receiver4
 32949ms (23.15 Mbps)
 32966ms (23.14 Mbps)
 33569ms (22.72 Mbps)

sender -> receiver1, receiver2, receiver3, receiver4, receiver5 
 33985ms (22.44 Mbps)
 33154ms (23.10 Mbps)
 33920ms (22.49 Mbps)

sender -> receiver1, receiver2, receiver3, receiver4, receiver5, receiver6
 35794ms (21.31 Mbps)
 34178ms (22.32 Mbps)
 34425ms (22.16 Mbps) 

sender -> receiver1, receiver2, receiver3, receiver4, receiver5, receiver6, receiver7
 40497ms (18.83 Mbps)
 40431ms (18.87 Mbps)
 40212ms (18.97 Mbps)

sender -> receiver1, receiver2, receiver3, receiver4, receiver5, receiver6, receiver7, receiver8
 42126ms (18.11 Mbps)
 43097ms (17.70 Mbps)
 40413ms (18.87 Mbps)

sender   : SUN OS 5.8 - 2x UltraSPARC-II  400MHz - 2024 MB
receiver : SUN OS 5.8 -    UltraSPARC-IIe 400MHz -  512 MB