Dan Werthimer wrote:
each GPU can handle 100 to 200 MHz dual pol depending on whether
you are doing coherent dedispersion (timing), or spectroscopy
(searching).
matthew and jonathan are the experts at reading data from ibob/roach and
using CPU cluster to do pulsar/transient search.
john ford, paul demorest, scott ransom et al are the experts at using
ibob/bee2
to packetize data (800 MHz dual pol) for GPU based pulsar cluster
(see their fantastic GUPPI instrument).
We could have up to 1400 MHz at once, 8200-8600 and 31,500-32,500 MHz
but I think only one polarization. I saw that John Ford is using 8 GPUs
for 800 MHz. Can you get several GPUs on the single bus of a multi-core
host or does that cause too much of a bottle-neck? I also should think
about doing the various piggy-back tasks in parallel. I'm guessing that
setispec on a ROACH is a tight fit. How about two? The kurtosis is a
very light task, I think, so can some of the left-over resources be used
to expand the SETI bandwidth or refine the resolution?
Anyway, for now it's some high-level wishing so I'll scope one unit at
three dual-channel ADCs, three ROACHes, two 4 core hosts, and 8 GPUs.
Does that seem reasonable? About $40K? (We have to pay Xilinx :-( .)
Thanks for your help
Tom
