xsimd | SIMD intrinsics and parallelized , optimized mathematical

 by   xtensor-stack C++ Version: 11.1.0 License: BSD-3-Clause

kandi X-RAY | xsimd Summary

kandi X-RAY | xsimd Summary

xsimd is a C++ library typically used in Big Data applications. xsimd has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

SIMD (Single Instruction, Multiple Data) is a feature of microprocessors that has been available for many years. SIMD instructions perform a single operation on a batch of values at once, and thus provide a way to significantly accelerate code execution. However, these instructions differ between microprocessor vendors and compilers. xsimd provides a unified means for using these features for library authors. Namely, it enables manipulation of batches of numbers with the same arithmetic operators as for single values. It also provides accelerated implementation of common mathematical functions operating on batches. You can find out more about this implementation of C++ wrappers for SIMD intrinsics at the The C++ Scientist. The mathematical functions are a lightweight implementation of the algorithms used in boost.SIMD.
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              xsimd has a medium active ecosystem.
              It has 1747 star(s) with 224 fork(s). There are 68 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 37 open issues and 250 have been closed. On average issues are closed in 796 days. There are 10 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of xsimd is 11.1.0

            kandi-Quality Quality

              xsimd has no bugs reported.

            kandi-Security Security

              xsimd has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              xsimd is licensed under the BSD-3-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              xsimd releases are not available. You will need to build from source code and install.
              Installation instructions, examples and code snippets are available.

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            xsimd Key Features

            No Key Features are available at this moment for xsimd.

            xsimd Examples and Code Snippets

            No Code Snippets are available at this moment for xsimd.

            Community Discussions

            QUESTION

            How to write fast c++ lazy evaluation code in Fastor or Xtensor?
            Asked 2020-Oct-11 at 10:40

            I am a newbie in c++, and heard that libraries like eigen, blaze, Fastor and Xtensor with lazy-evaluation and simd are fast for vectorized operation.

            I measured the time collapsed in some doing basic numeric operation by the following function:

            (Fastor)

            ...

            ANSWER

            Answered 2020-Oct-11 at 10:40

            The reason the Numpy implementation is much faster is that it does not compute the same thing as the two others.

            Indeed, the python version does not read z in the expression np.sin(x) * np.cos(x). As a result, the Numba JIT is clever enough to execute the loop only once justifying a factor of 100 between Fastor and Numba. You can check that by replacing range(100) by range(10000000000) and observing the same timings.

            Finally, XTensor is faster than Fastor in this benchmark as it seems to use its own fast SIMD implementation of exp/sin/cos while Fastor seems to use a scalar implementation from libm justifying the factor of 2 between XTensor and Fastor.

            Answer to the update:

            Fastor/Xtensor performs really bad in exp, sin, cos, which was surprising.

            No. We cannot conclude that from the benchmark. What you are comparing is the ability of compilers to optimize your code. In this case, Numba is better than plain C++ compilers as it deals with a high-level SIMD-aware code while C++ compilers have to deals with a huge low-level template-based code coming from the Fastor/Xtensor libraries. Theoretically, I think that it should be possible for a C++ compiler to apply the same kind of high-level optimization than Numba, but it is just harder. Moreover, note that Numpy tends to create/allocate temporary arrays while Fastor/Xtensor should not.

            In practice, Numba is faster because u is a constant and so is exp(u), sin(u) and cos(u). Thus, Numba precompute the expression (computed only once) and still perform the sum in the loop. The following code give the same timing:

            Source https://stackoverflow.com/questions/64293139

            QUESTION

            xtensor and xsimd: improve performance on reduction
            Asked 2019-Aug-11 at 17:07

            I'm trying to get the same performance with xtensor on the reduction operations (e.g. sum of elements) as in NumPy.

            I enable xsimd for parallel computing, but it has no effect.

            The following is the benchmark code:

            ...

            ANSWER

            Answered 2019-Aug-11 at 17:07

            According to this github issue that I have opened
            -mavx2 and -ffast-math flags should be enabled!

            Source https://stackoverflow.com/questions/57442255

            QUESTION

            How do I install ansible-galaxy on mac os using brew?
            Asked 2018-Nov-26 at 09:03

            Is it possible to install ansible galaxy using brew on mac os? I tried:

            ...

            ANSWER

            Answered 2018-Nov-21 at 22:59

            Once you install ansible on your machine using brew or pip you will get ansible-galaxy automatically it's not a package it's a subcommand of the ansible like ansible-vault ansible-doc etc.

            Source https://stackoverflow.com/questions/53368321

            QUESTION

            Performance of xtensor types vs. NumPy for simple reduction
            Asked 2017-Nov-23 at 10:55

            I was trying out xtensor-python and started by writing a very simple sum function, after using the cookiecutter setup and enabling SIMD intrinsics with xsimd.

            ...

            ANSWER

            Answered 2017-Nov-23 at 10:55

            wow this is a coincidence! I am working on exactly this speedup!

            xtensor's sum is a lazy operation -- and it doesn't use the most performant iteration order for (auto-)vectorization. However, we just added a evaluation_strategy parameter to reductions (and the upcoming accumulations) which allows you to select between immediate and lazy reductions.

            Immediate reductions perform the reduction immediately (and not lazy) and can use a iteration order optimized for vectorized reductions.

            You can find this feature in this PR: https://github.com/QuantStack/xtensor/pull/550

            In my benchmarks this should be at least as fast or faster than numpy. I hope to get it merged today.

            Btw. please don't hesitate to drop by our gitter channel and post a link to the question, we need to monitor StackOverflow better: https://gitter.im/QuantStack/Lobby

            Source https://stackoverflow.com/questions/47240338

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install xsimd

            A package for xsimd is available on the mamba (or conda) package manager.
            A package for xsimd is available on the Spack package manager.
            You can directly install it from the sources with cmake:.

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            gh repo clone xtensor-stack/xsimd

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            git@github.com:xtensor-stack/xsimd.git

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