[Beignet] GROMACS on beignet

[Szilárd Páll]

Hi,

I am a developer of the GROMACS (www.gromacs.org) molecular dynamics
simulation package. We have OpenCL offload for some of the
compute-intensive kernels which that works very well on AMD. I wanted to
assess how feasible is to use an Intel iGPU in GROMACS and after jumping
through some hoops I got a 4.2 kernel and beignet master installed.

Then I ran into the first minor issue: it seems that beignet does not
accept quoted includes although AFAIK the double-quoted include paths
should be accepted, but that did not work. No big deal, it doesn't work
with Apple's OpenCL either, but I thought I'd ask.

However, the bigger issue is that running on Haswell (HD 4600, I think) the
kernel produces results that are very off (while the very same source gives
correct results on other platforms). I've not much time to dig deeper, but
I thought I'd drop a mail maybe somebody is interested in helping out with
tips or even tracking down where the issue is.

Suggestions would be welcome!

Cheers,
--
Szilárd
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