Add kokkos-fft blog post #158

yasahi-hpc · 2025-03-14T08:21:06Z

This PR adds a blog post on kokkos-fft.

featuring some technical details and a real world example
links are valid

dalg24

Looks good overall

dalg24 · 2025-03-14T12:08:04Z

content/blog/blog-post-10.md

+
+* wishing to integrate in-situ signal and image processing with FFTs. E.g., spectral analyses, low pass filtering, etc.
+
+* __NOT__ willing to go through the documentation of de facto standard FFT libraries. They want to benefit from powerful vendor FFT libraries while working with a simple API like that of [`numpy.fft`](https://numpy.org/doc/stable/reference/routines.fft.html).


I don't get that point.
Is that about saying that the kokkos-fft API is easier to use than other C++ alternatives and inspired from numpy.fft?

Yes
I would like to say that the kokkos-fft API is easier to use than those of vendor libraries and inspired from numpy.fft?

I think that "easier" point is kind of subjective. It is certainly more intuitive to use for Python users, but I am not sure it is the case for hardcore fftw Fortran users.

Maybe "intuitive" then :)

@cedricchevalier19 I understand your point. Actually, what I am claiming here is that our API is as simple as numpy.fft. As you may say, fftw experts could only prefer fftw APIs

dalg24 · 2025-03-14T12:13:16Z

content/blog/blog-post-10.md

+# Prerequisites
+
+To use kokkos-fft, we need the following:
+
+* `CMake 3.22+`
+* `Kokkos 4.4+`
+
+Depending on your backend, you also need at least one of the following compilers (for the latest requirements, see [README](https://github.com/kokkos/kokkos-fft)):
+
+* `gcc 8.3.0+` (CPUs)
+* `IntelLLVM 2023.0.0+` (CPUs, Intel GPUs)
+* `nvcc 11.0.0+` (NVIDIA GPUs)
+* `rocm 5.3.0+` (AMD GPUs)
+
+# Using kokkos-fft in your CMake project
+
+For the moment, there are two ways to use kokkos-fft: include as a subdirectory in your CMake project or install as a library. Since kokkos-fft is a header-only library, it is easy to add it as a subdirectory in a CMake project. We will see how to do it.
+
+It is assumed that both Kokkos and kokkos-fft are placed under `<project_directory>/tpls`. Here is the structure of a simple CMake project.
+
+```
+---/
+ |
+ └──<project_directory>/
+    |──tpls/
+    |    |──kokkos/
+    |    └──kokkos-fft/
+    |──CMakeLists.txt
+    └──hello.cpp
+```
+
+See [here](https://kokkos.org/kokkos-core-wiki/get-started/integrating-kokkos-into-your-cmake-project.html#embedded-kokkos-via-add-subdirectory-and-git-submodules) about embedding Kokkos via `add_subdirectory()` and Git Submodules in your CMake project. Then, you need to clone the repo of kokkos-fft into `<project_directory>/tpls/kokkos-fft`.
+
+```bash
+git clone --recursive https://github.com/kokkos/kokkos-fft.git
+```
+
+The `CMakeLists.txt` file of the project would be
+
+```CMake
+cmake_minimum_required(VERSION 3.23)
+project(kokkos-fft-as-subdirectory LANGUAGES CXX)
+
+add_subdirectory(tpls/kokkos)
+add_subdirectory(tpls/kokkos-fft)
+
+add_executable(hello-kokkos-fft hello.cpp)
+target_link_libraries(hello-kokkos-fft PUBLIC Kokkos::kokkos KokkosFFT::fft)
+```
+
+To build the project, we basically rely on the CMake options for Kokkos. For example, the build steps for an A100 GPU based backend are as follows:
+
+```bash
+cmake -B build \
+      -DCMAKE_CXX_COMPILER=g++ \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DKokkos_ENABLE_CUDA=ON \
+      -DKokkos_ARCH_AMPERE80=ON
+cmake --build build -j 8
+```
+
+This way, all the FFT functionalities will be executed on the A100 GPU. For installation as a library, details are provided in the [documentation](https://kokkosfft.readthedocs.io/en/latest/intro/building.html#install-kokkosfft-as-a-library).


I would drop these two sections and defer to the kokkos-fft documentation.
You could say that the code for the following example can be found in the kokkos-fft repo and post a link.

Makes sense. I just tried to make this blog post self-contained. If it is not necessary, I can drop this part

yasahi-hpc · 2025-03-14T12:20:18Z

@dalg24 Thanks a lot for your comments.
I will try to fix as soon as possible.
Is there any deadline to merge this?

dalg24 · 2025-03-14T12:36:20Z

@dalg24 Thanks a lot for your comments.

I will try to fix as soon as possible.

Is there any deadline to merge this?

No hard deadline. But obviously we don't want to unnecessarily drag it too much.

yasahi-hpc · 2025-03-14T12:44:23Z

@dalg24 Thanks a lot for your comments.
I will try to fix as soon as possible.
Is there any deadline to merge this?

No hard deadline. But obviously we don't want to unnecessarily drag it too much.

Good. I think we can safely make it before the end of next week

yasahi-hpc · 2025-03-19T14:52:54Z

Hi @dalg24
May I have another review.

Since I have largely modified the source code, I made a benchmark again.
Surprisingly, with the new python, there is a factor of 2 speed up.
I added the compiler/version in the table for reproducibility.

yasahi-hpc · 2025-04-01T11:30:46Z

@dalg24
I have added the performance result on PVC as we have discussed yesterday.

Apparently it cannot be called like the directory I am a bit surprised as it was working on my local setup.

* Add poster session * Update content/blog/kug-2025-program-announced.md Co-authored-by: Damien L-G <dalg24+github@gmail.com> * Update content/blog/kug-2025-program-announced.md Co-authored-by: JBludau <104908666+JBludau@users.noreply.github.com> * Update main table --------- Co-authored-by: Damien L-G <dalg24+github@gmail.com> Co-authored-by: JBludau <104908666+JBludau@users.noreply.github.com>

Table is slightly less ugly that way

* Add blog post about new View implementation * Apply suggestions from code review * Rewrite with AI

* add pannel details * added note about edit * Update content/blog/kug-2025-program-announced.md Co-authored-by: Damien L-G <dalg24+github@gmail.com> --------- Co-authored-by: Damien L-G <dalg24+github@gmail.com>

* update main schedule to match hpsf * update afternoon session times * add update hint to top of page * swap in chris for benjamin * Shorten title for Chris' talk --------- Co-authored-by: Damien L-G <dalg24+github@gmail.com>

Rational: there is currently no tag for any other organization, not even a CEA one for the CExA Tea-Time page, and that "Sandia" tag is exclusively used here to annotate the Team page. It looks just out of place and yield a "Team" "Sandia" marking which is not the message we are trying to convey.

* Update publication list * Finish the job * Capitalize the e --------- Co-authored-by: Damien L-G <dalg24@gmail.com>

* Make citing-kokkos a top level alias on kokkos.org Splits citation instructions from publication list. * Apply suggestions from code review Co-authored-by: Damien L-G <dalg24+github@gmail.com> --------- Co-authored-by: Damien L-G <dalg24+github@gmail.com>

* Update the Kokkos Ecosystem Overview --------- Signed-off-by: Christian Trott <crtrott@sandia.gov> Co-authored-by: Damien L-G <dalg24+github@gmail.com>

* Add filed repot for KUG 2025 * Add pictures * Improve blog post * Add another picture * Add another picture * Update blog post and make it adhere to new file ordering Signed-off-by: Christian Trott <crtrott@sandia.gov> * Apply suggestions from code review Co-authored-by: Daniel Arndt <arndtd@ornl.gov> --------- Signed-off-by: Christian Trott <crtrott@sandia.gov> Co-authored-by: Christian Trott <crtrott@sandia.gov> Co-authored-by: Damien L-G <dalg24+github@gmail.com>

* Rename overview URL and tab * Remove about/{core,kernels,tools} pages Content was duplicated (word for word) in the overview page * Cleanup Documentation tabs Dropped Kernels API tab * Apply suggestions from code review Co-authored-by: Luc Berger <lberge@sandia.gov> --------- Co-authored-by: Luc Berger <lberge@sandia.gov>

yasahi-hpc · 2025-06-25T19:29:25Z

Closes
Opens a new one #184

dalg24 reviewed Mar 14, 2025

View reviewed changes

yasahi-hpc requested a review from dalg24 March 19, 2025 14:50

dalg24 requested a review from lucbv March 20, 2025 07:39

yasahi-hpc force-pushed the add-kokkos-fft-blog branch from 1e4dbca to 96238dc Compare April 1, 2025 11:25

dalg24 and others added 21 commits June 26, 2025 04:16

Add working groups info

1c0614d

Fixup page describing active working groups

bbf5fda

Apparently it cannot be called like the directory I am a bit surprised as it was working on my local setup.

Post information about next (10th) CExA teatime

c3c2d14

Add kokkos-fft blog post

526669f

update blog post based on reviews

3814848

Add bench result on PVC

80cc3ff

Adding build and packaging meeting link

a526e09

Release Briefing singular

6e7b53a

Add 4.6 release briefing as upcoming meeting

f12f3a5

Move the 4.6 release briefing to past events

f641372

Add 4.6 to the Releases page

c8068dc

Center the release number column

109c012

Table is slightly less ugly that way

Add blog post about Kokkos Core achieving passing grade with OpenSSF

f9ee944

Fiddle with sections

5d9050e

Mention HPSF

64f8ff0

Update Kokkos Kernels documentation URL

0c20663

Add blog post about new View implementation (kokkos#166)

f9e8338

* Add blog post about new View implementation * Apply suggestions from code review * Rewrite with AI

Panel announcement (kokkos#168)

701d1f5

* add pannel details * added note about edit * Update content/blog/kug-2025-program-announced.md Co-authored-by: Damien L-G <dalg24+github@gmail.com> --------- Co-authored-by: Damien L-G <dalg24+github@gmail.com>

Synchronize program with hpsf (kokkos#169)

f9b3e35

* update main schedule to match hpsf * update afternoon session times * add update hint to top of page * swap in chris for benjamin * Shorten title for Chris' talk --------- Co-authored-by: Damien L-G <dalg24+github@gmail.com>

Add link to video on YouTube for the last release briefing

b13c423

dalg24 and others added 19 commits June 26, 2025 04:16

Add link to release 4.4 video

90d0af0

Swap Sam's and Chris' talks to avoid conflicts

7747a71

Announce 11th CExA tea-time

c27e823

Add Mailing Lists page with instructions to subscribe to announcements

5d8c064

Add 4.6.1 to the releases page

ef48c45

Update publication list (kokkos#141)

fb81054

* Update publication list * Finish the job * Capitalize the e --------- Co-authored-by: Damien L-G <dalg24@gmail.com>

Add a note suggesting to browse Slack channels

e153946

Add "Citing Kokkos" tab under "About"

029075b

Remove KUG 2025 tab

af6ab4b

Publish "Working Group" page under "Community"

d26adb1

Update the Kokkos Ecosystem Overview (kokkos#178)

e3f3eba

* Update the Kokkos Ecosystem Overview --------- Signed-off-by: Christian Trott <crtrott@sandia.gov> Co-authored-by: Damien L-G <dalg24+github@gmail.com>

Move last tea-time to past events

dde0830

Announce next tea-time on C++20 modules

8ac55fd

Announce June Tea-Time

6b821c7

update based on joss submission

6885d41

yasahi-hpc force-pushed the add-kokkos-fft-blog branch from a94d427 to 6885d41 Compare June 25, 2025 19:16

yasahi-hpc closed this Jun 25, 2025

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		* wishing to integrate in-situ signal and image processing with FFTs. E.g., spectral analyses, low pass filtering, etc.

		* __NOT__ willing to go through the documentation of de facto standard FFT libraries. They want to benefit from powerful vendor FFT libraries while working with a simple API like that of [`numpy.fft`](https://numpy.org/doc/stable/reference/routines.fft.html).

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