KarlI am aware of the methodology. However, is there any example / can you
share some examples of interfacing an Eigen matrix with fast_copy ? As per the
API, if we detect an Eigen Matrix then something specific for VCL & Eigen comes
up. Thanks and Regards
Sumit
From: Karl Rupp <[email protected]>
To: Sumit Kumar <[email protected]>
Cc: "[email protected]"
<[email protected]>
Sent: Wednesday, August 5, 2015 7:38 PM
Subject: Re: [ViennaCL-devel] ViennaCL fast_copy() matrices
Hi,
> I have a dense matrix (2048 x 2048) on the GPU and I want to copy it
> back to a host matrix on the CPU (2048 x 2048). Is there any example of
> using fast_copy() ? 2048 is a multiple of 128.
examples/benchmarks/dense_blas.cpp
http://viennacl.sourceforge.net/doc/namespaceviennacl.html#a92695ea6fa06cb0b9d940bb14080b62a
Best regards,
Karli
> ------------------------------------------------------------------------
> *From:* Karl Rupp <[email protected]>
> *To:* Sumit Kumar <[email protected]>
> *Cc:* "[email protected]"
> <[email protected]>
> *Sent:* Monday, August 3, 2015 1:23 AM
> *Subject:* Re: [ViennaCL-devel] ViennaCL reductions
>
> Hi Sumit,
>
> > I was trying to run sparse matrix multiplication, but one of my explicit
> > template typedefs had Int. After some digging, I found out that CSR only
> > supported Float or double. Is there any reason for this? Can we also
> > have support for other templates? (like int ?)
>
> It is technically possible, but we haven't implemented it yet. After 5
> years you are the first to even ask for it ;-)
>
>
> > Another thing would be the alignment order. Suppose I have a Row-major
> > Sparse Eigen matrix, then I can copy it to a (Row-Major ?) VCL
> > compressed matrix. What about a column-major sparse Eigen matrix?
>
> If you can point me to a fast, massively parallel column-major
> matrix-vector multiplication routine, I look into it. However, as far as
> I know, there is no such routine for general sparse matrices, hence it
> does not make sense for us to support it.
>
> Best regards,
> Karli
>
>
>
>
>
>
> > ------------------------------------------------------------------------
> > *From:* Karl Rupp <[email protected] <mailto:[email protected]>>
> > *To:* Sumit Kumar <[email protected] <mailto:[email protected]>>
> > *Cc:* "[email protected]
> <mailto:[email protected]>"
> > <[email protected]
> <mailto:[email protected]>>
> > *Sent:* Friday, July 31, 2015 9:04 PM
> > *Subject:* Re: [ViennaCL-devel] ViennaCL reductions
> >
> > Hi Sumit,
> >
> > > I am aware that Eigen can do it for its matrices and I am also aware
> > > that VCL cannot do it natively. My question was this:
> > > In your example of interfacing with Eigen, you have shown a VCL dense
> > > matrix interfacing with an Eigen dense matrix. Do you have any example
> > > of interfacing an Eigen Sparse matrix with a VCL dense matrix?
> >
> > No, we don't have this.
> >
> >
> >
> >
> > Best regards,
> > Karli
> >
> >
> >
> >
>
>
>
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