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RE: [Discuss-gnuradio] Upgrade (downgrade?) to a Q6600 CPU

From: Bob McGwier
Subject: RE: [Discuss-gnuradio] Upgrade (downgrade?) to a Q6600 CPU
Date: Wed, 10 Dec 2008 14:59:05 -0500

Are you taking full advantage of the multi threading now available?  Are you
running a 64 bit version of Linux?

Have you tried compiling GnuRadio with the following flags?

-O3 -msse -msse3 -mfpmath=sse

The gain from the multiple cores is that more threads get "two thirds of
processor" making the aggregate faster but NOT necessarily the single


ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
"And yes I said, yes I will Yes", Molly Bloom

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Marcus D. Leech
Sent: Wednesday, December 10, 2008 1:22 PM
To: GNURadio Discussion List
Subject: [Discuss-gnuradio] Upgrade (downgrade?) to a Q6600 CPU

I've been running my radio astronomer receiver software for a couple of
years on a Dual-core Pentium P25 CPU, with
  2GB of 533 Ram, with the CPU clocked at 3.2Ghz.   This has allowed me
to do 8Mhz dual-polarization continuum and
  spectrum, with very few overruns (uOuOuO)

I "upgraded" this system to a Quad-core Q6600, with 4Gb of 667Mhz
ram.    It's only able to do 4.5Mhz in situations where
  the previous system could handle 8Mhz.  This is, of course, a big
disappointment, since I was hoping that multiple cores
  would increase the ability for me to add more complex signal
processing, but maintain the same bandwidth as the old system.

Apart from the obvious hardware upgrades (move to a MOBO that can
overclock the Q6600 into the 3Ghz region, and use
  dual-channel RAM), are there software tweaks (I'm thinking
particularly of USB buffering or something) that would allow me to get
  performance, without overruns?

Note that I'm using the latest trunk code, as of a few days ago.

Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium

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