Pallas and LanaiXP, sporadic gaps

ReneStorm rene at renestorm.de
Fri Jun 20 18:01:35 EDT 2003


Hi Folks,

does anyone have experience with the Pallas Benchmark and the new Myrinet
LanaiXP Cards ?

Problem: I ve got some strang, sporadic gaps on our 32 Node (64 CPU)
Cluster.

Example:
processes 32: (32 waiting in barrier)
SendRecv

byte     	Mb/sec
512    	74.54
1024		129.78
2048		193.25
4096		252.89
8192		 46.84
16384		 70.79
32768		230.63
32768		256.37

Cluster Equipment:
32x Myrinet Lanai M3F-PCIXD-2  Myrinet-Fiber/PCI-X Interface, 64x 2.4 Ghz,
32 GB Mem
All myrinet cards are running with 133 MHz, (PCI read/write above 800
MB/sec).
Compiler: gcc, pgroup, intel

The configuration looks fine. Cards are very fast.
8 byte PingPong below 7usec, Peak Bandwidth near 500 MB/sec

Thanks in advance and have a nice weekend.
Rene

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