Hi all.
We're working hard on cleaning up our 800 MHz Coherent Dedispersion pulsar
machine for production. We have it working with 8 GPU machines, and from
64 to 2048 coarse channels.
One problem we have is that with our output FPGA that rearranges the data
and ships it off simultaneously over
Hi John,
Are you running this arm() command on the BEE2 or are you using a udp or tcp
server? Does it write the value in ascii or binary mode? BORPH has
occasionally acted strangely for us when we use ascii mode so we don't use
it anymore.
Mark
On Fri, Jan 29, 2010 at 1:23 PM, John Ford
Hi John,
Are you running this arm() command on the BEE2 or are you using a udp or
tcp
server?
There is a server on the bee2 that receives the arm() command from a
client and then executes it locally on the control FPGA.
Does it write the value in ascii or binary mode?
Don't know. will
I'm trying to scope the hardware required for SERENDIP-type science
piggy-backing on DSN down-link (passive, no transmitter) tracks.
As a baseline, I'm assuming one ROACH per antenna per activity.
Possible activities would be:
* searching for pulsars and transient pulses
* SETI
*
hi tom,
there's a lot of current work in the areas you asked about:
terry filiba recently ported the ibob based pulsar instrumentation to roach,
(peter mcmahon and she developed this for parkes pulsar work).
jonathan kocz and mathew bailes are working on roach porting as well.
see peter's
Hi Tom,
One of the main bandwidth limitations in pulsar processing is the length of
the dedispersion chirp function, which goes down quadratically with
increasing frequency. Generally people split the band up into several ~4 MHz
channels and coherently dedisperse each one separately. Each of these
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
On Fri, 29 Jan 2010, Tom Kuiper wrote:
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
On Friday 29 January 2010 10:18:42 pm John Ford wrote:
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
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