[SCore-users-jp] Re: [SCore-users] Something strange in PM/Ethernet Network Trunking

[Shinji Sumimoto]

Hi.

Sorry for late response because of holidays in Japan.

Have you changed the values maxnsend and backoff options in
pm-ethernet.conf?  If so, how about pmtest communication performace?

Shinji.

From: Chen Hao <hchen ＠ mdl.ipc.pku.edu.cn>
Subject: [SCore-users] Something strange in PM/Ethernet Network Trunking
Date: Wed, 28 Apr 2004 20:50:12 +0800
Message-ID: <408FA884.2020508 ＠ mdl.ipc.pku.edu.cn>

hchen> Hello all, I used PMB 2.2.1 to measure SCORE/MPI performance and found 
hchen> something string. When I used two 3C905B NICs, I got the results of 
hchen> PingPong and Pingping as following:
hchen> #---------------------------------------------------
hchen> # Benchmarking PingPong
hchen> # ( #processes = 2 )
hchen> # ( 14 additional processes waiting in MPI_Barrier)
hchen> #---------------------------------------------------
hchen>        #bytes #repetitions      t[usec]   Mbytes/sec
hchen>             0         1000        49.13         0.00
hchen>             1         1000        49.89         0.02
hchen>             2         1000        50.40         0.04
hchen>             4         1000        50.54         0.08
hchen>             8         1000        50.86         0.15
hchen>            16         1000        52.92         0.29
hchen>            32         1000        56.37         0.54
hchen>            64         1000        62.83         0.97
hchen>           128         1000        75.88         1.61
hchen>           256         1000        98.53         2.48
hchen>           512         1000       151.50         3.22
hchen>          1024         1000       247.95         3.94
hchen>          2048         1000       347.78         5.62
hchen>          4096         1000       463.81         8.42
hchen>          8192         1000       594.80        13.13
hchen>         16384         1000      1056.45        14.79
hchen>         32768         1000      1754.30        17.81
hchen>         65536          640      3122.35        20.02
hchen>        131072          320      5992.52        20.86
hchen>        262144          160     11469.87        21.80
hchen>        524288           80     22598.54        22.13
hchen>       1048576           40     44952.29        22.25
hchen>       2097152           20     89360.53        22.38
hchen>       4194304           10    178679.39        22.39
hchen> #---------------------------------------------------
hchen> # Benchmarking PingPing
hchen> # ( #processes = 2 )
hchen> # ( 14 additional processes waiting in MPI_Barrier)
hchen> #---------------------------------------------------
hchen>        #bytes #repetitions      t[usec]   Mbytes/sec
hchen>             0         1000        55.40         0.00
hchen>             1         1000        54.75         0.02
hchen>             2         1000        52.09         0.04
hchen>             4         1000        55.12         0.07
hchen>             8         1000        53.07         0.14
hchen>            16         1000        58.13         0.26
hchen>            32         1000        57.33         0.53
hchen>            64         1000        67.17         0.91
hchen>           128         1000        79.80         1.53
hchen>           256         1000        98.88         2.47
hchen>           512         1000       164.32         2.97
hchen>          1024         1000       252.47         3.87
hchen>          2048         1000      1901.03         1.03
hchen>          4096         1000      3520.96         1.11
hchen>          8192         1000      2870.28         2.72
hchen>         16384         1000     10062.60         1.55
hchen>         32768         1000     10718.80         2.92
hchen>         65536          640     20858.36         3.00
hchen>        131072          320     26830.07         4.66
hchen>        262144          160     39868.81         6.27
hchen>        524288           80     62836.03         7.96
hchen>       1048576           40    108759.45         9.19
hchen>       2097152           20    194836.70        10.27
hchen>       4194304           10    379412.10        10.54
hchen> we could see that pingpong's bandwidth is very poor when packet is from 
hchen> 2KB to 64KB, what's the matter?
hchen> 
hchen> ChenHao
hchen> _______________________________________________
hchen> SCore-users mailing list
hchen> SCore-users ＠ pccluster.org
hchen> http://www.pccluster.org/mailman/listinfo/score-users
hchen> 
hchen> 
------
Shinji Sumimoto, Fujitsu Labs
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