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juliacall: Julia GC triggered from a python thread causes hangs

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#578 3 comentários 1 reação 0 responsáveis Ver no GitHub

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Avaliação

Dificuldade
4/5
Tempo estimado
3-5 dias
Facilidade para iniciantes
30/100
Tipo de issue
Bug
Clareza
Precisa de esclarecimento
Status de atividade
Estagnada
Stack de tecnologia
julia, python
Domínio
backend

Direção de pesquisa

Comece executando o reprodutor de threading em Python fornecido com JuliaCall e inspecione os caminhos de chamada de PythonCall JlWrap/any.jl e JlWrap/base.jl mostrados no stack trace. Compare o comportamento com o GC do Julia habilitado e desabilitado; considera-se concluído quando a chamada de GC em uma thread é concluída sem travar nos ambientes relatados.

Escrita pelo modelo de indexação a partir do texto da issue.

Descrição

bug

Affects: JuliaCall

Describe the bug
I am seeing Julia tasks launched from parallel python threads lead to sporadic hangs. Short-running tasks suffer less from this. I had no luck using the tricks from #539 or here. I think the hangs are triggered by Julia GC - disabling GC with Base.GC.enable(false) beforehand seems to fix the hangs - and triggering Julia GC manually from a python thread immediately causes a hang.

This is all with PYTHON_JULIACALL_HANDLE_SIGNALS set to yes, in case that matters.

from juliacall import Main as jl
jl_gc = jl.Base.GC.gc

import threading
t = threading.Thread(target=jl_gc)
t.start()  # hangs every time (100% CPU)

Terminating python gives me

[89363] signal (15): Terminated: 15
in expression starting at none:0
jl_gc_wait_for_the_world at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gc.c:241 [inlined]
ijl_gc_collect at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gc.c:3515
gc at ./gcutils.jl:129 [inlined]
gc at ./gcutils.jl:129 [inlined]
pyjlany_call at /Users/username/.julia/packages/PythonCall/Nr75f/src/JlWrap/any.jl:45
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:3077
(pyproj) c889f3b4c8d7:pyproj username$ _pyjl_callmethod at /Users/username/.julia/packages/PythonCall/Nr75f/src/JlWrap/base.jl:73
_pyjl_callmethod at /Users/username/.julia/packages/PythonCall/Nr75f/src/JlWrap/C.jl:63
jfptr__pyjl_callmethod_9032 at /Users/username/.julia/compiled/v1.10/PythonCall/WdXsa_v1O0R.dylib (unknown line)
_jl_invoke at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:0 [inlined]
ijl_apply_generic at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-release-1-dot-10/src/gf.c:3077
jlcapi__pyjl_callmethod_9116 at /Users/username/.julia/compiled/v1.10/PythonCall/WdXsa_v1O0R.dylib (unknown line)
method_vectorcall_VARARGS at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
PyObject_Vectorcall at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyEval_EvalFrameDefault at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyObject_FastCallDictTstate at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
slot_tp_call at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyObject_Call at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_PyEval_EvalFrameDefault at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
method_vectorcall at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
thread_run at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
pythread_wrapper at /Users/username/miniforge3/envs/pyproj/bin/python3.12 (unknown line)
_pthread_start at /usr/lib/system/libsystem_pthread.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0)
Allocations: 3689147 (Pool: 3684864; Big: 4283); GC: 6

Your system

  • MacOS, Apple Silicon, Julia 1.10.5
  • Linux, x86_64, Julia 1.10.6
  • PythonCall/juliacall 0.9.23
Linguagem predominante
Julia
Estrelas
1.1k
Forks
89
Merge médio
2d 15h
PRs com merge (30d)
7

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