Article: Parallelism at HotPar 2010
By: Carlie Coats (coats.delete@this.baronams.com), August 8, 2010 4:34 am
Room: Moderated Discussions
>BTW, why X5460?
>Of all Harpertown Xeons X5460 appears to be least suited for HPC clusters since
>it combines high 120W TDP with relatively modest 1333 MT/s system bus. If you go
>for 120W you could as well buy 1600 MT/s X5472. But low power L5430 seem the most
>attractive. In memory bandwidth starved environment it would give nearly the same
>performance as X5460 in more than twice lower power envelop.
The benchmark is over a year old, and it's the comparison
the vendor gave us, when running our daily-work as a benchmark.
As far as the Infiniband limits, note that the Nehalems
still scale much better from 16 to 32 (and then to 64,
which I didn't show) than do the Harpertowns. Nehalem
not only is much faster (presumably putting more pressure
on the network), but performance still improved about 15%
from 32 to 64, while Harpertown performanc decreased about
10% from 32 to 64.
Or are you saying that it's the network-cards themselves?
>Of all Harpertown Xeons X5460 appears to be least suited for HPC clusters since
>it combines high 120W TDP with relatively modest 1333 MT/s system bus. If you go
>for 120W you could as well buy 1600 MT/s X5472. But low power L5430 seem the most
>attractive. In memory bandwidth starved environment it would give nearly the same
>performance as X5460 in more than twice lower power envelop.
The benchmark is over a year old, and it's the comparison
the vendor gave us, when running our daily-work as a benchmark.
As far as the Infiniband limits, note that the Nehalems
still scale much better from 16 to 32 (and then to 64,
which I didn't show) than do the Harpertowns. Nehalem
not only is much faster (presumably putting more pressure
on the network), but performance still improved about 15%
from 32 to 64, while Harpertown performanc decreased about
10% from 32 to 64.
Or are you saying that it's the network-cards themselves?