Re: AW: NAMD crashes with OpenMPI/OpenMX

From: Thomas Albers (
Date: Wed Jun 15 2011 - 09:10:28 CDT


> Which TCP congestion control
> algorithm do you use (reno or cubic) -> try highspeed (sysctl -a/-w),

Cubic, but should this matter at all, considering that the precompiled
binary uses UDP?

> what kind of gigabit network adapter do you use, is it onboard and if, which
> bus connection does it have (pci or pcie) or is it a plugged pcie nic?

Intel PCI-E card w/ 82574 chip.

> Another thing is the capacity of the switch, have you tried to run two such
> jobs simultaneously on 12 cores for example?

According to the datasheet the capacity of the switch is 16 Gbit/s,
and testing reveals that send and receive rates are close to
theoretical, even with all for computers sending and receiving


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