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DATE 2016-10-01

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MESSAGE
DATE 2016-10-31
FROM Christopher League
SUBJECT Re: [Learn] cuda kernels
From learn-bounces-at-nylxs.com Mon Oct 31 17:33:52 2016
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From: Christopher League
To: Ruben Safir , Samir Iabbassen ,
learn-at-nylxs.com
In-Reply-To: <9570d66b-7c02-4e2d-3225-20e008158f0d-at-mrbrklyn.com>
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Date: Mon, 31 Oct 2016 17:33:47 -0400
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Subject: Re: [Learn] cuda kernels
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Ruben Safir writes:

> The video says that the below lines ask for 64 copys of the kernel on 64
> threads? I don't see that
>
> cudaMemcpy(d_in, h_in, ARRAY_BYTES, cudaMemcpyHostToDevice);
> //launch kernel
> square<<<1, ARRAY_SIZE>>>(d_in, d_out);
> cudaMemcpy(h_out, d_out, ARRAY_BYTES, cudaMemcpyDeviceToHost);

I don't really know anything about CUDA yet, but ARRAY_SIZE was 64. And
this syntax: `square<<<1, ARRAY_SIZE>>>` is NOT valid C/C++ syntax. So I
assume that the specialized GPU compiler interprets that in a way that
it distributes the computation of the `square` function across 64 GPU
threads...?

BTW, I'm pretty sure "kernel" here doesn't refer to "the Linux kernel."

CL

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1.0, user-scalable=3Dyes">




Ruben Safir ruben-at-mrbrklyn.com=
writes:



The video says that the below lines ask for 64 copys of the kernel on 64=
threads? I don=E2=80=99t see that


cudaMemcpy(d_in, h_in, ARRAY_BYTES, cudaMemcpyHostToDevice);
//launch kernel
square<<<1, ARRAY_SIZE>>>(d_in, d_out);
cudaMemcpy(h_out, d_out, ARRAY_BYTES, cudaMemcpyDeviceToHost);


I don=E2=80=99t really know anything about CUDA yet, but ARRAY_SIZE was =
64. And this syntax: square<<<1, ARRAY_SIZE>>>e> is NOT valid C/C++ syntax. So I assume that the specialized GPU compiler=
interprets that in a way that it distributes the computation of the =
square
function across 64 GPU threads=E2=80=A6?


BTW, I=E2=80=99m pretty sure =E2=80=9Ckernel=E2=80=9D here doesn=E2=80=
=99t refer to =E2=80=9Cthe Linux kernel.=E2=80=9D


CL





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