[Beowulf] Mare Nostrum (not quite COTS)
patrick at myri.com
Sun Feb 20 23:46:59 PST 2005
Vincent Diepeveen wrote:
> Which myrinet cards are in Mare Nostrum?
Single link PCI-X D cards, with 4 MB of SRAM to be comfortable with
multiples routes between a lot of nodes. The NICs for the BladeCenter
have a specific format: smaller than regular half-size PCI boards, NIC
is // to the mainboard and has no fiber transceiver (goes to the OPM via
the Bladecenter backplane). Available only via IBM.
> What one way pingpong latency can it get from 1 end of the machine to the
> other end of the machine?
I don't know, I didn't work on this machine. It would depend on the
number of crossbars and lengths of fiber. I uses the new switches with
32-port crossbars, so the max path should not be longer than 7 hops if
my memory is right. At one time, the PCI-X on the JS-20 blades was
clocked at 100 MHz, I don't know if it has been bumped to 133 MHz since.
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