Re: SIMD

Hi Geoff, Thanks for the update. I found this https://ghc.haskell.org/trac/ghc/blog/weekly20141020

Geoff Mainland stepped up and fixed Data Parallel Haskell to work with a new version of vector and GHC. Austin had disabled DPH a few weeks prior due to its difficulty to upgrade, and divergent source trees. With 7.10, GHC will hopefully ship a more modern vector and dph to boot.

From what you say this has been superseded? Also seems that this page https://ghc.haskell.org/trac/ghc/wiki/SIMD https://ghc.haskell.org/trac/ghc/wiki/SIMD should be updated and if I knew what it should say I would volunteer to update it. A bit of background on why I am asking these questions: I am working on a Monte Carlo simulation and performance is a key issue. We are using parallelisation to good effect (after some interesting issues with thread affinity https://ghc.haskell.org/trac/ghc/ticket/10229 https://ghc.haskell.org/trac/ghc/ticket/10229) but I am trying to understand what other options might be available to speed things up. Dominic Steinitz dominic@steinitz.org http://idontgetoutmuch.wordpress.com

On 13 Apr 2015, at 13:37, Geoffrey Mainland wrote:

SIMD support was merged to HEAD before the 7.8 release, so any version of GHC after 7.8 has SIMD support built-in.

If you want a branch that compiles with DPH, I'm afraid you are out of luck. DPH no longer builds at all, and I believe Austin actually deleted the simd branch mentioned on the Wiki.

Geoff

On 04/13/2015 02:54 AM, Simon Peyton Jones wrote:

...

Geoff Mainland is the originator of the SIMD instruction set work. Let’s see what he says.

Simon

*From:*Glasgow-haskell-users [mailto:glasgow-haskell-users-bounces@haskell.org] *On Behalf Of *Dominic Steinitz *Sent:* 11 April 2015 17:45 *To:* GHC users *Subject:* SIMD

What’s the story with this? I tried to follow the instructions here: https://ghc.haskell.org/trac/ghc/wiki/SIMD but I get

~ $ git clone -b simd http://git.haskell.org/ghc.git <http://git.haskell.org/ghc.git http://git.haskell.org/ghc.git>

Cloning into 'ghc'...

fatal: Remote branch simd not found in upstream origin

Dominic Steinitz

dominic@steinitz.org mailto:dominic@steinitz.org mailto:dominic@steinitz.org>

http://idontgetoutmuch.wordpress.com http://idontgetoutmuch.wordpress.com/