Meson GPU build fails due to undefined ext_modules and common_sources

[ZCY2013]

When enabling the GPU build (-Duse_gpu=true), meson.build references ext_modules and common_sources, but neither is defined anywhere in the file. This causes Meson configuration to fail before build.

• meson setup /extern/scs-python/.mesonpy-3d_30kqi -Dbuildtype=release -Db_ndebug=if-release -Db_vscrt=md -Dlink_cudss=true -Dint32=true -Duse_gpu=true --native-file=/extern/scs-python/.mesonpy-3d_30kqi/meson-python-native-file.ini
  The Meson build system
  Version: 1.10.1
  Source dir: ~/extern/scs-python
  Build dir: /extern/scs-python/.mesonpy-3d_30kqi
  Build type: native build
  WARNING: Project does not target a minimum version but uses feature introduced in '1.1': meson.options file. Use meson_options.txt instead
  Project name: scs
  Project version: undefined
  C compiler for the host machine: cc (gcc 11.4.0 "cc (Ubuntu 11.4.0-1ubuntu122.04) 11.4.0")
  C linker for the host machine: cc ld.bfd 2.38
  Host machine cpu family: x86_64
  Host machine cpu: x86_64
  Program python found: YES (/usr/bin/python3.12)
  Library openblas found: YES
  Compiler for C supports arguments -Wno-unused-result: YES
  Library rt found: YES
  Run-time dependency CUDA (modules: cudart_static) found: YES 12.4 (/usr/local/cuda)

  ../meson.build:132:4: ERROR: Unknown variable "common_sources".

[bodono]

Are you following the instructions here?

Here is a colab where I install the gpu version.

[ZCY2013]

Yes, I've already reviewed the documentation you mentioned. Let me rephrase my issue more clearly:

Current Status & Issue:

I'm trying to install SCS with GPU support in Python 3.12 environment to benchmark the performance difference between GPU direct and GPU indirect modes. However, I'm experiencing some challenges:

Current Installation:

Following the official documentation, I can only install the GPU direct version (using scs_cudss), but not the GPU indirect version.

Source Code Analysis:

Through my review of the source code (specifically the meson.build file), I discovered that enabling GPU indirect mode likely requires an additional build parameter -Csetup-args=-Duse_gpu=True. This parameter appears to be responsible for generating the _scs_gpu module that GPU indirect mode depends on. However, this parameter is not mentioned in the official documentation.

Compilation Error:

When I add the GPU indirect build parameter, I encounter the following compilation error:

./meson.build:132:4: ERROR: Unknown variable "common_sources"

Questions:

1. Is my understanding correct that the _scs_gpu module is required for GPU indirect mode?
2. What is the correct way to enable GPU indirect mode during installation?
3. How should I resolve the common_sources compilation error?

Environment Details:

Python 3.12
CUDA 12.4
OS: Ubuntu 22.04

I would appreciate guidance on the proper installation procedure for enabling both GPU direct and GPU indirect modes. Thank you!

[bodono]

The indirect GPU solver is basically unmaintained at this point and I don't think it really works well anymore, but you should be able to install it via the instructions here.