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of more complicated "processors". Both approaches have their own strong and weak points. Massively parallel architecture allows GPUs to execute shaders at decent speeds, crunching huge amounts of data in massively parallel manner, crushing awesome amount of data per clock cycle (much more than any usual CPU could hope to do). So while GPU runs on 1GHz or less, it could easily outrun 4GHz CPUs on some code. Initially it has been designed to compute 3D scenes at decent speed. However, since processing units are SIMD ALUs, they have no trouble to execute generic code which is not about 3D at all. And you can be pretty sure that on some kinds of tasks which could run in parallel, GPUs would beat traditional CPUs. GPU haves very fast RAM on wide buses and large numbers of processing units so if task could run in parallel and does not requires awful amount of RAM (i.e. fits GPU RAM or even better local caches) it would skyrocket in computation speed. Sometimes it could be 20 times faster or so. On other hand, if algo can't run in parallel well or requires extensive execution flow control, it's not something that would benefit from running it on GPU. Each SIMD element is quite weak on it's own. It's massively parallel execution what makes GPU to shine. So if algo can't run well on many ALUs at same time, there will be no huge gain. Also, GPUs are optimized for applying operations to huge amount of data in more or less sequential ways, which is typical for 3D scenes. So it's not like if GPU would cope well with many jumps or other ways of changing code execution flow. They usually have much less blocks to handle these operation so GPUs aren't great on such algos. So, basically, GPUs are large number of relatively weak processors. OpenCL offers somehow standard, software-accessible interface for compiling and then running code on some hardware. Including this kind of hardware, too. Code obviously runs on SIMD engine, same thing which runs shaders to compute scenes when doing 3D. In fact, usually graphic computations and opencl could mix. There is some kind of resource manager/arbiter which allows them coexist and run on the same ALUs.
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using it. As a younger physicist/programmer I know there are a tremendous number of older engineers/physicists who are definitely not programmers. They can only use what they know how to use, which quite often includes archaic FORTRAN or some MatLAB implementation. For them CUDA has the advantage that Nvidia has already had an army of developers come up with frontend solutions that fit straight into what they already know. I don't like that Nvidia did this instead of working within OpenCL but here we are. Portability vs. Accessibility.
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processes. The particulars of hardware heterogeneity among end-users make it less practical for mass produced end-user applications. Besides, most end-user aplication developers are not "riding the waves crest" so to speak, they have long established production logistics and it takes them more time to incorporate technology then do streamlined research teams and groups. One technical end-user application with OpenCL implementations is
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digital hardware items that are not processors can be realized. Furthermore, it is unclear to me from reading this article as to whether OpenCl supports (or is envisioned to support at some time in the future) hardware programming of FPGAs (that is, what one would normally do by way of
Verilog and/or VHDL). Given this, I propose the following candidates as a replacement for the wiki's first sentence:
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And then the wording - things like "actual 1.1 incomplete, mostly done AMD Radeon GCN" are not really proper
English, it reads more or less like a note than anything else. It also fails to mention the contribution of Collabora and Microsoft, along with the support of OpenCL 1.2 in the latest version.
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Given that Snow
Leopard was only officially announced today, and OpenCL as part of it, we are likely to have more detail on the API in the coming days. At this point in time this entry is only suitable as a stub. I have added a reference to an Apple press release, but it is very light on substance in
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Just a remark here that as important as portability is, I know that as a programmer I have a tendency to underestimate the importance of accessibility. At the end of the day, no matter how elegant or flexible your code is, if you do not have people packaging it up for non-programmers no one will be
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As for GPUs, modern GPUs could be basically viewed as large array of SIMD-like ALUs. Exact implementation details are different across vendors so AMD and Nvidia have quite different architectures, where AMD sticks to larger numbers of simple processing elements while nvidia sticks to smaller number
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Candidate B: Open
Computing Language (OpenCL) is a framework (1) for writing programs that execute across heterogeneous platforms consisting of central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), processors realized on field-programmable gate arrays
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It seems to me that the first sentence in the wiki is misleading and confusing as it seems to imply that FPGA's are processors (...." (FPGAs) and other processors"), which they are not. An FPGA is (basically) a digital hardware blank canvas within which a processor as well as just about all other
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The paper doesn't include any real code, doesn't mention the used operating system, drivers, OpenCL or CUDA version. The paper also does not mention the date of publishing (it cites papers from 2010, so it must be from, at least, 2010) -- the only known about the test is that it's being done using
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This approach allows programmers who write OpenCL computation kernels not to care on which target their OpenCL kernel would actually execute and which instructions set it uses: it's up to OpenCL implementation to handle this. It have to build OpenCL kernel to native code of target platform. OpenCL
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I ref'd some other stuff, but I'm not sure if it satisfies replacing {{unreferenced}} with {{stub}}. P.S. Gotta love how Apple PR is abusing "Open" and "standard" in the passive voice "has been proposed as an open standard" b.s. meaningless PR speak, but I don't know how to when quoting a press
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Basically, OpenCL implementation does all job required to translate some abstract source code (which is flavor of C language) into native executable code which could be executed on target device(s). So, implementation should have some kind of compiler for some kind of supported architecture to be
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The comparisons never compare CUDA with OpenCL. They compare NVIDIA's implementation of CUDA to NVIDIA's implementation of OpenCL. NVIDIA is, unsuprisingly, quite slow at releasing OpenCL updates (it took until
Christmas for them to relase OpenCL 1.1). The languages are effectively the same so I
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Candidate A: Open
Computing Language (OpenCL) is a framework for writing programs that execute across heterogeneous platforms consisting of central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), processors realized on field-programmable gate arrays
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So it usually would be some kind of compiler which builds OpenCL kernels from provided source upon function call, some runtime which implements all required features and some glue which does some misc. things like actually uploading compiled code to device, starting it and fetching computation
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In fact, implementation could vary and is up to implementers how to do it. Standard only defines how things should work and what interfaces will be available. But anyone is free to implement it in any way they can imagine. There are many ways to achieve the same result. More than one different
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I have a 2007-era GPU, and GPU Caps Viewer reports that it supports OpenCL 1.1, which was released in 2010. It does not appear that OpenCL support is strongly linked to when a GPU was released; therefore it seems unnecessary to state when an OEM produced their first OpenCL chips, unless it's
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and I am trying to use it myself. But I´ve already found out most implementations are in development, so they didnt reach all goal features and are highly technical to use. With stardard Matlab knowledge, you could use OpenCL hardware to do some matlab functions up to 100x faster than without
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People most interested in running OpenCL are researchers in computer science, mathematics and related subjects, as the outrageous processing power would give processing power 27 times that of an $ 1000.00 i7 (very rough estimation). Such power come at the cost of long programing and debugging
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Thanks for fixing this page up! It is all valid information that's been collected; the Open-ness will be revealed or Apple will be mocked. Just "has been proposed as an open standard" doesn't cut it -- we need to find out to which standards body this language has been submitted for proposed
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Since there is (yet) no support for programming FPGAs using OpenCL I would get rid of it entirely. OpenCL is only meant to be executed on processors -- any FPGA with a processor realized will fit this description, but even then it still requires some support from the operating system used.
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implementation exists. Some implementations are quite different from others. The nice thing is that all implementations are exposing more or less the same interface. So program do not have to know how exactly some implementation actually implements all things on actual hardware.
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NVIDIA tools and the data is based on execution of some test on a GeForce 260. While this might have been true when the paper was written, it is not possible, from the paper alone, to tell if it's relevant to anyone today -- if ever. I would ignore the paper entirely.
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more data were transferred. CUDA’s kernel execution was also consistently faster than OpenCL’s, despite the two implementations running nearly identical code. CUDA seems to be a better choice for applications where achieving as high a performance as possible is
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For all problem sizes, both the kernel and the end-to-end times show considerable difference in favor of CUDA. The OpenCL kernel’s performance is between about 13 % and 63% slower, and the end-to-end time is between about 16% and 67% slower.
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OpenCL and DirectCompute are competitors because the code from the one (OpenCL for example) will work on Any GPGPU graphics cards CUDA and Stream (by nVidia\ATI respectively)are proprietary, and will work on that companies processors
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implementation exposes library function which does so. Implementer should also implement all required functions/features described in OpenCL standard, so programs would be presented standard OpenCL interface as described in standard.
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Although OpenCL is designed for GPUs, categorizing it as "Graphics
Software" seems misleading: it's design purpose has been general-purpose computing on GPUs, not graphics-related computation (although this is for sure possible). --
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at reddit. It doesn't provide anything concrete, hence the inclusion in the discussion page, rather that the article. If the thread is anything to go by it would seem that the details are still being obscured by an NDA
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First it said the implementation was "formerly called CLOVER" citing a 2013 source, but then why did the 2018 sources still call it "Clover"? I feel like some sort of elaboration is required there.
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Since most OpenCL drivers are for no good reason very demanding to OS, they don't work on
Windows XP and older CPUs, that makes developers not to consider OpenCL. I've found on the Internet that
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In our tests, CUDA performed better when transferring data to and from the GPU. We did not see any considerable change in OpenCL’s relative data transfer performance as
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IIRC Apple added or will add optimizations based on LLVM and OpenCL to MacOS X software. I am totally unsure about this though, but I'm too lazy to recheck the facts :)
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The section about CUDA overstresses low level h/w tweaking and forgets portability issues. There are no sources for the conclusion, so I marked the section
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https://web.archive.org/20110516092008/http://developer.amd.com:80/zones/OpenCLZone/courses/Documents/Introduction_to_OpenCL_Programming%20(201005).pdf
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Dispute no longer seems active so I have tried to reflect the above discussion and have removed header. Apologies if I've missed the point.
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For old Intel processors (like P4) or on-board GPU (like Intel G33/31): ATI Stream SDK 2.3 is the last version that supports
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the link to the general purpose computing benchmark is broken. is there an official benchmark that can be downloaded and run somewhere?
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Two comparisons suggest that if the OpenCL implementation is correctly tweaked to suit the GPU architecture they perform similarly
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Further remark: the two sources that are provided for the performance comparison between CUDA and OpenCL comes to two conclusions:
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able to take OpenCL kernel source as input and compile it into some native executable code of target platform and then execute it.
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https://web.archive.org/20110906045531/http://developer.amd.com:80/documentation/articles/pages/OpenCL-and-the-AMD-APP-SDK.aspx
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https://web.archive.org/20110804010819/http://developer.amd.com:80/documentation/articles/pages/OpenCL-and-the-AMD-APP-SDK.aspx
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I'd really like to know how OpenCL is actually implemented, not just the list of dates in which things were implemented.
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wouldn't expect one to perform significantly better than the other except if a particular implementation is inferior.
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and related topics on
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https://web.archive.org/20090809065559/http://developer.amd.com:80/GPU/ATISTREAMSDKBETAPROGRAM/Pages/default.aspx
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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i think that OpenCL has 1 Competitor and that is DirectCompute, where as the article lists CUDA as one...
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https://web.archive.org/20140116074408/http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6633603
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topics on Knowledge. If you would like to participate, please visit the project page, where you can join
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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https://web.archive.org/20110717054302/http://software.intel.com:80/en-us/articles/opencl-release-notes/
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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http://www.hpcwire.com/topic/applications/RapidMind_Embraces_Open_Source_and_Standards_Projects.html
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I recognize that Apple was the founder to OpenCL and they own trademarks and so forth but since the
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http://www.betanews.com/article/So_what_is_OpenCL_Apples_next_enhancement_to_Mac_OS_X_106/1213196124
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Both sources seems fair, both only treat performance, nothing else. The conclusions of the section
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https://web.archive.org/20091202065250/http://www.s3graphics.com:80/en/news/news_detail.aspx?id=44
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Cut because it was redundant or introduces new material. May be reincorporated in body later one.
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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https://www.altera.com/products/design-software/embedded-software-developers/opencl/overview.html
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before doing mass systematic removals. This message is updated dynamically through the template
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before doing mass systematic removals. This message is updated dynamically through the template
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Reyes, Ruymán; LĂłpez-RodrĂguez, Iván; Fumero, Juan J.; de Sande, Francisco (27–31 August 2012).
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Yes, OpenCL has been used in various fields. For example, there are several Bitcoin miners
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Jääskeläinen, Pekka O.; de La Lama, Carlos S.; Huerta, Pablo; Takala, Jarmo H. (July 2010).
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Has OpenCL been used for anything? Is there software I can run on my GPU through OpenCL? —
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1920:. EURO-PAR 2012 International European Conference on Parallel and Distributed Computing.
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has taken over, is it really correct to list Apple as the developer in the info box? --
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If you found an error with any archives or the URLs themselves, you can fix them with
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If you found an error with any archives or the URLs themselves, you can fix them with
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http://developer.amd.com/documentation/articles/pages/OpenCL-and-the-AMD-APP-SDK.aspx
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http://developer.amd.com/documentation/articles/pages/OpenCL-and-the-AMD-APP-SDK.aspx
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https://web.archive.org/20090405072046/http://www.pcper.com:80/comments.php?nid=6954
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OpenCL can be used to give an application access to a graphics processing unit for
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Open Source implementation - confusing wording; and Mesa status possibly outdated?
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The article needs to be re-writing to get better, something like the articles of
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I am betting that Candidate A is most correct. Any one else care to comment?
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the second one claims "comparable", and that earlier comparisons were unfair.
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http://developer.amd.com/GPU/ATISTREAMSDKBETAPROGRAM/Pages/default.aspx#one
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after the link to keep me from modifying it. Alternatively, you can add
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after the link to keep me from modifying it. Alternatively, you can add
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to keep me off the page altogether. I made the following changes:
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http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6633603
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to keep me off the page altogether. I made the following changes:
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2010 International Conference on Embedded Computer Systems (SAMOS)
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I agreed with you and tried to make the summary more accurate.
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http://software.intel.com/en-us/articles/opencl-release-notes/
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accULL: An OpenACC Implementation with CUDA and OpenCL Support
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Both Altera and Xilinx now support OpenCL for their FPGAs.
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In my opinion, this reference does not support the sentence.
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When you have finished reviewing my changes, please set the
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When you have finished reviewing my changes, please set the
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http://www.xilinx.com/products/design-tools/sdx/sdaccel.html
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http://www.s3graphics.com/en/news/news_detail.aspx?id=44
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I have just added archive links to 6 external links on
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I have just added archive links to 3 external links on
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once it's fully released it will get more attention ;)
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C-Class Computer hardware articles of Low-importance
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the first one claims 30% better performance of CUDA,
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https://www.x.org/Events/XDC2017/Stellard_GPGPU.pdf
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2541:C-Class software articles of Unknown-importance
2406:3.0.11 available with bugfixes since 6 May 2022
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1890:"Does the OpenACC API run on top of OpenCL?"
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276:and see a list of open tasks.
42:Put new text under old text.
2127:05:29, 24 January 2016 (UTC)
1926:10.1007/978-3-642-32820-6_86
1805:10.1109/ICSAMOS.2010.5642061
1669:19:29, 4 February 2015 (UTC)
1419:09:02, 31 October 2013 (UTC)
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1868:Dr. Dobb's
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