On 07/11/2013 03:57 PM, LD Zhang wrote:
Hi Folks,
The number of sustainable gnuradio
processing speed – I guess in terms of MFLOPS – is important
for designing application. Suppose I have a FIR filter with a
number of taps operating on a streaming sample of x Msps, this
would translate to a certain number of required MFLOPS. And
this number needs to be below the sustainable gnuradio MFLOPS
limit. Hence my question is say on a 1GHz processor, what is
the gnuradio MFLOPS limit running on this processor?
Thanks,
LD
Nobody is going to be able to give you a definitive answer. Much
depends on the processor in question -- internal details including
pipelining
efficiency, cache sizes, etc, etc.
But having said that, a FIR filter is, from a high-level simply a
series of multiply-accumulate operations -- one per tap.
Conventionally, one
"FLOP" is one multiply-accumulate so, to a very sloppy
first-order, a 100-tap FIR filter requires about 100 FLOPs. Now,
unfortunately, a FIR
filter doesn't live in "isolation", it has much surrounding
scaffolding and infrastructure.
The only way to really get a handle on this stuff is to build test
cases, and *measure on the target platform*.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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