[SCore-users] score, myrinet & leak of bandwith ??

[Andreas Vitz]

Hello Score Group!

Is there a known problem with score5.0.1 and maximum transferrate's on 
myrinet-cards??

Our cluster uses PCI64B 133MHz Myrinet Cards. (FC version)

I expect a rate for large messages at about  236 MByte/s.
			( http://www.myricom.com/myrinet/performance/index.html)


Benchmarking our cluster with a PinPong-test  from  PMB
		(http://www.pallas.com/e/products/pmb/index.htm)	results in following table


#---------------------------------------------------
# Benchmarking PingPing
# ( #processes = 2 )
# ( 2 additional processes waiting in MPI_Barrier)
#---------------------------------------------------
       #bytes #repetitions      t[usec]   Mbytes/sec
            0         1000         3.73         0.00
            1         1000         3.79         0.25
            2         1000         3.89         0.49
            4         1000         3.89         0.98
            8         1000         4.00         1.91
          16         1000         4.03         3.78
          32         1000         4.12         7.41
          64         1000         4.47        13.66
        128         1000         4.82        25.34
        256         1000         5.69        42.90
        512         1000         6.85        71.30
      1024         1000         8.98       108.79
      2048         1000        13.30       146.83
      4096         1000        20.91       186.81
      8192         1000        34.21       228.40
    16384         1000        64.97       240.51
    32768         1000       121.45       257.31
    65536          640       291.85       214.15
  131072          320       770.79       162.17
  262144          160      1529.62       163.44
  524288           80      3166.46       157.90
1048576           40      6329.02       158.00
2097152           20     12631.95       158.33
4194304           10     25504.80       156.83

the expexted 236 mb/s for large messages aren't reached.

Anybody an Idea??

Further information:

we use: 
- Intel(R) Xeon(TM) CPU 1700MHz
- with Supermicro Mainboards P4DC6
- and 1GB ram


Andreas Vitz