Hello,
My few cents about it:
lumin, on Fri 13 Nov 2015 13:55:52 +0000, wrote:
> Debian's CUDA/experimental is QUITE OUT OF DATE so that
> it fails to work with GCC-5.
It's cuda 6.5. Cuda 7.0 is not *that* new. AIUI, it was officially
released by Nvidia in March 2015.
Yes, the push to gcc-5 posed a lot of problems, CUDA is one of
them. That's actually exactly why I make the starpu-contrib package
build-depend on older versions of gcc instead of the default version of
gcc.
> but I don't understand why Debian experimental holds such an
> .......... 6.5 version, compared with the one Archlinux ships.
[...]
> Following is my dch, and you can see there are still some items remained to be
> done:
You named it :)
Thanks for your contribution that will hopefully help getting cuda 7.0
or 7.5 packages out faster.
> FYI: As far as I know, in my experiments,
> a Tesla K20C GPU works 5+ times faster than an Intel Xeon W3690.
That's not a reason for rushing to CUDA 7.0 or later. A K20C will work
fine with CUDA 6.5. Also, helping free software to support NVIDIA GPUs
would help avoiding the issue :)
> I'm afraid that I have to bump CUDA to 7.5, to solve the FTBFS of Caffe.
> which really fixes CUDA's attitude towards GCC-5.
I guess there is no way to backport the CUDA 7.5 fixes to support GCC-5?
(damn the non-free software...)
> What makes me happy is, the compilation for gcc-4.9 on *.cu files
> of Caffe runs well. CUDA-7.0.28 supports up to g{cc,++}-4.9, but
> still not working with g{cc,++}-5.
Urgl, so CUDA 7.0 is not even enough?
I guess we may want to skip 7.0 and directly upload 7.5.
> The caffe builds failed because liking ELFs to v5libs with g{cc,++}-4.9,
> so it matches my expectation.
Ok, so your case is indeed completely screwed for now, due to the
unfortunate combination of libstdc++ transition, late release of gcc-5,
and thus late support of gcc-5 in CUDA (a couple of months ago only).
That's basically a "flag day^Wmonth" issue.
So yes, the answer is: "please be patient, we are working on it. Help is
welcome".
Samuel
