Directly pixi run fails on apple, but success via pixi shell

General
1

I try to run puzzles via pixi

pixi shell

mojo run solutions/p01/p01.mojo

mojo run solutions/p02/p02.mojo

But direct run pixi run p01 -e apple will got below error

/Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/problems/p01/p01.mojo:16:19: warning: assignment to 'i' was never used; assign to '_' instead?
    i = thread_idx.x
                  ^
out: HostBuffer([0.0, 0.0, 0.0, 0.0])
expected: HostBuffer([10.0, 11.0, 12.0, 13.0])
stack trace was not collected. Enable stack trace collection with environment variable `MOJO_ENABLE_STACK_TRACE_ON_ERROR`
Unhandled exception caught during execution: At /Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/problems/p01/p01.mojo:51:29: AssertionError: `left == right` comparison failed:
   left: 0.0
  right: 10.0
/Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/.pixi/envs/default/bin/mojo: error: execution exited with a non-zero result: 1

pixi info

System
------------
       Pixi version: 0.55.0
           Platform: osx-arm64
   Virtual packages: __unix=0=0
                   : __osx=15.6.1=0
                   : __archspec=1=m1
          Cache dir: /Users/posheng_chang/Library/Caches/rattler/cache
       Auth storage: /Users/posheng_chang/.rattler/credentials.json
   Config locations: No config files found

Global
------------
            Bin dir: /Users/posheng_chang/.pixi/bin
    Environment dir: /Users/posheng_chang/.pixi/envs
       Manifest dir: /Users/posheng_chang/.pixi/manifests/pixi-global.toml

Workspace
------------
               Name: mojo-gpu-puzzles
            Version: 1.0.0
      Manifest file: /Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/pixi.toml
       Last updated: 03-10-2025 20:40:35

Environments
------------
        Environment: nvidia
           Features: nvidia, default
        Solve group: nvidia
           Channels: nvidia, https://conda.modular.com/max-nightly, conda-forge
   Dependency count: 7
       Dependencies: python, mojo, max, bash, manim, mdbook, pre-commit
   Target platforms: linux-64, osx-arm64
    Prefix location: /Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/.pixi/envs/nvidia
System requirements: cuda = "12"
              Tasks: p12, p09, p33, viz03, p19, p18-test-kernels, p20, p28, tests, p05_layout_tensor, check-macos, p11, clean-profiles, initcheck, clean-all, viz15, p08_layout_tensor, p13, book, p03, build-book, p06, gpu-specs, viz07, synccheck, viz12, racecheck, gpu-info, rooflineviz, p25, viz11, p11_layout_tensor, p08, p07_layout_tensor, p34, format, thread_indexing, viz13, p17, p22, p32, p31, setup-cuda-gdb, viz05, p05, clean-animations, p10, viz02, p04_layout_tensor, p27, p24, clean, viz16, p12_layout_tensor, install-pre-commit, p18-package, viz08, viz04, p07, viz01, memcheck, p18, p21, layout_tensor_intro, sanitizers, p14, viz06, set-buffer-cache, p16, p02, p26, p23, p30, p15, p01, p04, generate-animations, viz14, p29

        Environment: amd
           Features: amd, default
        Solve group: amd
           Channels: https://conda.modular.com/max-nightly, conda-forge
   Dependency count: 7
       Dependencies: python, mojo, max, bash, manim, mdbook, pre-commit
   Target platforms: linux-64, osx-arm64
    Prefix location: /Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/.pixi/envs/amd
              Tasks: p12, p09, p33, viz03, p19, p18-test-kernels, p20, p28, tests, p05_layout_tensor, check-macos, p11, clean-profiles, initcheck, clean-all, viz15, p08_layout_tensor, p13, book, p03, build-book, p06, gpu-specs, viz07, synccheck, viz12, racecheck, gpu-info, rooflineviz, p25, viz11, p11_layout_tensor, p08, p07_layout_tensor, p34, format, thread_indexing, viz13, p17, p22, p32, p31, setup-cuda-gdb, viz05, p05, clean-animations, p10, viz02, p04_layout_tensor, p27, p24, clean, viz16, p12_layout_tensor, install-pre-commit, p18-package, viz08, viz04, p07, viz01, memcheck, p18, p21, layout_tensor_intro, sanitizers, p14, viz06, set-buffer-cache, p16, p02, p26, p23, p30, p15, p01, p04, generate-animations, viz14, p29

        Environment: apple
           Features: apple, default
        Solve group: apple
           Channels: https://conda.modular.com/max-nightly, conda-forge
   Dependency count: 7
       Dependencies: python, mojo, max, bash, manim, mdbook, pre-commit
   Target platforms: osx-arm64, linux-64
    Prefix location: /Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/.pixi/envs/apple
System requirements: macos = "15.0"
              Tasks: p12, p09, p33, viz03, p19, p18-test-kernels, p20, p28, tests, p05_layout_tensor, check-macos, p11, clean-profiles, initcheck, clean-all, viz15, p08_layout_tensor, p13, book, p03, build-book, p06, gpu-specs, viz07, synccheck, viz12, racecheck, gpu-info, rooflineviz, p25, viz11, p11_layout_tensor, p08, p07_layout_tensor, p34, format, thread_indexing, viz13, p17, p22, p32, p31, setup-cuda-gdb, viz05, p05, clean-animations, p10, viz02, p04_layout_tensor, p27, p24, clean, viz16, p12_layout_tensor, install-pre-commit, p18-package, viz08, viz04, p07, viz01, memcheck, p18, p21, layout_tensor_intro, sanitizers, p14, viz06, set-buffer-cache, p16, p02, p26, p23, p30, p15, p01, p04, generate-animations, viz14, p29

        Environment: default
           Features: nvidia, default
           Channels: nvidia, https://conda.modular.com/max-nightly, conda-forge
   Dependency count: 7
       Dependencies: python, mojo, max, bash, manim, mdbook, pre-commit
   Target platforms: linux-64, osx-arm64
    Prefix location: /Users/posheng_chang/Work/work_modular/mojo-gpu-puzzles/.pixi/envs/default
System requirements: cuda = "12"
              Tasks: p12, p09, p33, viz03, p19, p18-test-kernels, p20, p28, tests, p05_layout_tensor, check-macos, p11, clean-profiles, initcheck, clean-all, viz15, p08_layout_tensor, p13, book, p03, build-book, p06, gpu-specs, viz07, synccheck, viz12, racecheck, gpu-info, rooflineviz, p25, viz11, p11_layout_tensor, p08, p07_layout_tensor, p34, format, thread_indexing, viz13, p17, p22, p32, p31, setup-cuda-gdb, viz05, p05, clean-animations, p10, viz02, p04_layout_tensor, p27, p24, clean, viz16, p12_layout_tensor, install-pre-commit, p18-package, viz08, viz04, p07, viz01, memcheck, p18, p21, layout_tensor_intro, sanitizers, p14, viz06, set-buffer-cache, p16, p02, p26, p23, p30, p15, p01, p04, generate-animations, viz14, p29
2

Try removing the pixi.lock and running a pixi clean. It’s possible that your apple Pixi environment has a different Mojo version installed than your default one. I believe the first command will shell into default and the second will run in the apple environment.

3

Thanks for response.

I got same issue even run

rm pixi.lock
pixi clean

BTW, my apple Pixi environment does not has different Mojo version installed.

4

Could it be that

mojo run solutions/p01/p01.mojo

is running the completed solution to Problem 1, where

pixi run p01

runs the command

mojo problems/p01/p01.mojo

which is for the unfinished problem? If you haven’t filled in the problem to solve it, that would explain why it is failing the correctness check.

2 Likes
5

Oh yes, I see. You’re right. I didn’t notice that.

Thanks a lot.