From 3e10a5e79c6aa1b7cce82bd31a553cc3d95e2cfe Mon Sep 17 00:00:00 2001 From: julianmorillo Date: Tue, 12 May 2026 17:21:32 +0200 Subject: [PATCH 1/5] Add blog entry regarding the availability of lfoss in RISC-V --- docs/blog/posts/2026/05/lfoss-riscv.md | 114 +++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 docs/blog/posts/2026/05/lfoss-riscv.md diff --git a/docs/blog/posts/2026/05/lfoss-riscv.md b/docs/blog/posts/2026/05/lfoss-riscv.md new file mode 100644 index 0000000000..ff0efe836e --- /dev/null +++ b/docs/blog/posts/2026/05/lfoss-riscv.md @@ -0,0 +1,114 @@ +--- +authors: [julianmorillo] +date: 2026-05-12 +slug: lfoss-riscv +--- + +# `lfoss/2025b` now available in the EESSI RISC-V stack + +The EESSI RISC-V software stack available through the `dev.eessi.io/riscv` repository +now includes the `lfoss/2025b` toolchain. + +This is an important milestone for the RISC-V enablement work in EESSI, since it brings a +modern LLVM-based software toolchain to the growing collection of software available for +RISC-V systems through EESSI. + + + +The RISC-V software stack is distributed through the EESSI development repository +infrastructure and is intended for experimentation, testing, and early adoption of RISC-V +support in EESSI. + +## What is `lfoss` + +`lfoss` is the LLVM-based counterpart to the widely used `foss` toolchain in EESSI and +EasyBuild ecosystems. + +Where `foss` is centered aroung GCC, the `lfoss` family uses LLVM/Clang while still +providing the familiar scientific software stack components such as MPI, BLAS/LAPACK, FFT +libraries, and related HPC tooling. + +The availability of `lfoss/2025b` on RISC-V is particularly relevant because LLVM's RISC-V +backend has matured significantly in recent years, making it increasingly viable for HPC +and scientific computing workloads. + +## Why this matters + +Adding `lfoss/2025b` to the EESSI RISC-V stack provides several benefits: + ++ access to a modern LLVM/Clang-based compiler environment on RISC-V; ++ broader compiler coverage for portability testing; ++ improved support for projects already using LLVM toolchains; ++ additional opportunities to validate and improve RISC-V support in HPC software +ecosystems. + +This also helps align the RISC-V stack more closely with the software offerings already +available on x86\_64 and AArch64 platforms in EESSI. + +## Accessing the RISC-V stack + +The RISC-V stack is currently provided through the dedicated RISC-V development +repository. To access it, just: + +``` +$ export EESSI_VERSION_OVERRIDE=2025.06-001 +$ source /cvmfs/software.eessi.io/versions/2025.06/init/lmod/bash +This EESSI production version only provides a RISC-V compatibility layer, +software installations are provided by the EESSI development repository at /cvmfs/dev.eessi.io/riscv. + +Module for EESSI/2025.06 loaded successfully +EESSI has selected riscv64/generic as the compatible CPU target for EESSI/2025.06 +EESSI did not identify an accelerator on the system +(for debug information when loading the EESSI module, set the environment variable EESSI_MODULE_DEBUG_INIT) +``` + +On a RISC-V system, this will initialize the RISC-V software stack environment. + +You can then verify that the new toolchain is available: + +``` +module avail lfoss +``` + +and load it via: + +``` +module load lfoss/2025 +``` + +## Availability in `dev.eessi.io/riscv` + +The RISC-V stack is currently hosted in the EESSI development infrastructure, which is +intended for pre-release and experimental software deployments. + +As with the rest of the RISC-V repository: + ++ software availability is still evolving; ++ builds may be updated or replaced; ++ the stack currently focuses on generic RISC-V targets. + +The RISC-V repository already contains a growing collection of scientific software and toolchains. + +## Looking ahead + +The addition of `lfoss/2025b` in another step toward broader and more mature RISC-V +support within EESSI. + +Future work will include: + ++ expanding software coverage built with LLVM-based toolchains; ++ improving validation and CI coverage for RISC-V; ++ enabling additional optimized RISC-V targets as the ecosystem matures; ++ continuing collaboration with the broader RISC-V and HPC communities. + +RISC-V remains an exciting and rapidly developing architecture for HPC and scientific +computing, and EESSI aims to make portable, reproducible software stacks readily +available for emerging platforms. + +## Learn more + ++ [EESSI RISC-V repository documentation](https://www.eessi.io/docs/repositories/dev.eessi.io-riscv/) ++ [dev.eessi.io documentation](https://www.eessi.io/docs/repositories/dev.eessi.io/) ++ [Available software in EESSI](https://www.eessi.io/docs/available_software/) ++ [foss toolchain documentation](https://www.eessi.io/docs/available_software/detail/foss) + From fb0f5ae3a123e97e13d240079399c17542f8d7a7 Mon Sep 17 00:00:00 2001 From: julianmorillo Date: Tue, 12 May 2026 17:25:30 +0200 Subject: [PATCH 2/5] Fix typo --- docs/blog/posts/2026/05/lfoss-riscv.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/blog/posts/2026/05/lfoss-riscv.md b/docs/blog/posts/2026/05/lfoss-riscv.md index ff0efe836e..7d2ed61944 100644 --- a/docs/blog/posts/2026/05/lfoss-riscv.md +++ b/docs/blog/posts/2026/05/lfoss-riscv.md @@ -24,7 +24,7 @@ support in EESSI. `lfoss` is the LLVM-based counterpart to the widely used `foss` toolchain in EESSI and EasyBuild ecosystems. -Where `foss` is centered aroung GCC, the `lfoss` family uses LLVM/Clang while still +Where `foss` is centered around GCC, the `lfoss` family uses LLVM/Clang while still providing the familiar scientific software stack components such as MPI, BLAS/LAPACK, FFT libraries, and related HPC tooling. From 5c2ad6ca00308a65cf640f621a03932b7dc6b396 Mon Sep 17 00:00:00 2001 From: julianmorillo Date: Wed, 13 May 2026 09:38:31 +0200 Subject: [PATCH 3/5] Update docs/blog/posts/2026/05/lfoss-riscv.md MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Accept improvements proposed by @bedroge Co-authored-by: Bob Dröge --- docs/blog/posts/2026/05/lfoss-riscv.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/blog/posts/2026/05/lfoss-riscv.md b/docs/blog/posts/2026/05/lfoss-riscv.md index 7d2ed61944..40c7b54117 100644 --- a/docs/blog/posts/2026/05/lfoss-riscv.md +++ b/docs/blog/posts/2026/05/lfoss-riscv.md @@ -48,7 +48,7 @@ available on x86\_64 and AArch64 platforms in EESSI. ## Accessing the RISC-V stack The RISC-V stack is currently provided through the dedicated RISC-V development -repository. To access it, just: +repository. To access it, make sure that the `software.eessi.io` and `dev.eessi.io` CernVM-FS repositories are available on your system, and then just run: ``` $ export EESSI_VERSION_OVERRIDE=2025.06-001 From d53b64d6e5867b16b7b950b2b06307c0bd1e5266 Mon Sep 17 00:00:00 2001 From: julianmorillo Date: Wed, 13 May 2026 09:39:21 +0200 Subject: [PATCH 4/5] Update docs/blog/posts/2026/05/lfoss-riscv.md MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix typo (missing "b" in "lfoss/2025b" Co-authored-by: Bob Dröge --- docs/blog/posts/2026/05/lfoss-riscv.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/blog/posts/2026/05/lfoss-riscv.md b/docs/blog/posts/2026/05/lfoss-riscv.md index 40c7b54117..ae9b3585e2 100644 --- a/docs/blog/posts/2026/05/lfoss-riscv.md +++ b/docs/blog/posts/2026/05/lfoss-riscv.md @@ -73,7 +73,7 @@ module avail lfoss and load it via: ``` -module load lfoss/2025 +module load lfoss/2025b ``` ## Availability in `dev.eessi.io/riscv` From 6ef1137108d06ac9595c41c0bc1578b32f1cf29b Mon Sep 17 00:00:00 2001 From: julianmorillo Date: Wed, 13 May 2026 09:39:51 +0200 Subject: [PATCH 5/5] Update docs/blog/posts/2026/05/lfoss-riscv.md MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix typo Co-authored-by: Bob Dröge --- docs/blog/posts/2026/05/lfoss-riscv.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/blog/posts/2026/05/lfoss-riscv.md b/docs/blog/posts/2026/05/lfoss-riscv.md index ae9b3585e2..c37ba5c107 100644 --- a/docs/blog/posts/2026/05/lfoss-riscv.md +++ b/docs/blog/posts/2026/05/lfoss-riscv.md @@ -91,7 +91,7 @@ The RISC-V repository already contains a growing collection of scientific softwa ## Looking ahead -The addition of `lfoss/2025b` in another step toward broader and more mature RISC-V +The addition of `lfoss/2025b` is another step toward broader and more mature RISC-V support within EESSI. Future work will include: