[Trilinos-Announce] FW: C++17 Requirement Plans for Kokkos

[Ober, Curtis C]

Hi all,

The Kokkos team wanted to inform folks about the upcoming release plans for Kokkos (see below). The Trilinos team will be working with Kokkos over the next several months to coordinate this transition.

As noted below, please let us, the Trilinos team and the Kokkos team, know of any questions or concerns.

Thanks,
Curt

--

Curtis C. Ober, Ph.D.
Acting Manager
Computational Science, 1446
Sandia National Laboratories, NM
P.O. Box 5800, Mail Stop 1320
Albuquerque, New Mexico, 87185-1320
(W) 505-844-1846
(M) 505-306-6876
ccober at sandia.gov

From: "Trott, Christian Robert" <crtrott at sandia.gov>
Date: Monday, May 23, 2022 at 7:27 PM
To: Michael Wolf <mmwolf at sandia.gov>, Curtis Ober <ccober at sandia.gov>, "Glass, Micheal W" <mwglass at sandia.gov>, "Fisher, Travis C" <tcfishe at sandia.gov>, Roger Pawlowski <rppawlo at sandia.gov>, James Willenbring <jmwille at sandia.gov>, "Crozier, Paul S" <pscrozi at sandia.gov>
Subject: C++17 Requirement Plans for Kokkos

Hi all,

LLNL finally finished the upgrade of Sierra, and thus CUDA 11 is now available on all DOE production platforms with NVIDIA GPUs. With that we finally can make more concrete plans. My understanding is that the experiments on LLNL machines with Sandia codes and CUDA 11 were largely successful and no major road block exists. If this is not so let me know as soon as possible. Also feel free to distribute this message as wide as you may. I will also discuss below plan at the release briefing tomorrow, and will put it on our slack channel. Curt: if you could forward this also to the Trilinos stake holder list?

Kokkos’s tentative plan is as follows:


-          Current Status:

o   Release 3.6.00 is out, supports CUDA 9 and up, as well as C++14 except for the SYCL and OpenMPTarget backend

o   A 3.6.01 patch release is upcoming.

-          June 2022:

o   Release 3.7.00 candidate will be branched off develop

o   Will support CUDA 9 and up, as well as C++14 except for SYCL and OpenMPTarget

o   Typically release process will take a few weeks.

o   develop branch will be set to requiring C++17 after the 3.7 branch is created.

§  This means no CUDA 9/10 on develop

§  Also Intel 19, and GCC 7 as minimum

§  We will also start removing deprecated features!

-          August 2022:

o   Release 4.0 will be prepared

o   As stated above will require C++17

o   Expect to hit Trilinos September

o   Will coordinate with Trilinos to intercept Trilinos 14 which also removes deprecated code.

-          Rest of 2022 maybe through 2023:

o   We are considering backporting bug fixes to 3.7

o   Note this will be ONLY bug fixes, no new features

o   Depending on demand we may do this for 6-12 months.

o   Would take the form of 3.7.xx patch releases, which are NOT merged into Trilinos

§  Trilinos could decide whether they want to merge it into a 13.x support branch.

How to prepare:


-          Compile with C++17

-          Turn off deprecated code

o    -DKokkos_ENABLE_DEPRECATED_CODE_3:BOOL=OFF

o    This will REMOVE deprecated code via ifdefs

-          This works with 3.6, so you can report issues now.

Please let me know if you have any concerns.

On behalf of the Kokkos team
Christian
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