Opened 5 months ago
Closed 4 months ago
#29755 closed defect (worksforme)
Multiprocessing in tensor computations does not work under macOS
Reported by: | egourgoulhon | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | performance | Keywords: | multiprocessing, parallelization, macOS |
Cc: | Merged in: | ||
Authors: | Reviewers: | Dima Pasechnik | |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
Multiprocessing, as implemented in differential geometry computations via
sage: Parallelism().set(nproc=8)
does not work under macOS. This has been reported by many users, a recent report being https://groups.google.com/d/msg/sage-support/0RsGgb3lmZg/zNTMFLH9AQAJ
Note there is no issue within the doctest framework, i.e. the doctests involving parallel computations implemented in src/sage/manifolds/differentiable
and src/sage/tensor/modules
are passed on macOS machines.
Change History (7)
comment:1 follow-up: ↓ 2 Changed 5 months ago by
comment:2 in reply to: ↑ 1 Changed 5 months ago by
Replying to dimpase:
it is not clear how to see that it is broken. Could you point at a doctest that doesn't work at the Sage prompt?
For instance, the doctest about the parallelization of the Lie derivative, a short version of which is
sage: M = Manifold(2, 'M') sage: X.<x,y> = M.chart() sage: v = M.vector_field(-y, x) sage: w = M.one_form(y^2*sin(x), x^3*cos(y)) sage: Parallelism().set(nproc=2) sage: w.lie_derivative(v).display() (-y^3*cos(x) + x^3*cos(y) + 2*x*y*sin(x)) dx + (-x^4*sin(y) - 3*x^2*y*cos(y) - y^2*sin(x)) dy
comment:3 Changed 5 months ago by
The OP at https://groups.google.com/d/msg/sage-support/0RsGgb3lmZg/WNxT_rzNAwAJ says that the problem is fixed in Sage 9.1. Dima, can you confirm this? (sorry I don't have any macOS computer at hand...). If yes, we may close this ticket.
comment:4 follow-up: ↓ 6 Changed 5 months ago by
- Milestone changed from sage-9.2 to sage-duplicate/invalid/wontfix
- Reviewers set to Dima Pasechnik
- Status changed from new to needs_review
works for me on macOS and Sage 9.2.beta0
comment:5 Changed 5 months ago by
- Status changed from needs_review to positive_review
comment:6 in reply to: ↑ 4 Changed 5 months ago by
comment:7 Changed 4 months ago by
- Resolution set to worksforme
- Status changed from positive_review to closed
it is not clear how to see that it is broken. Could you point at a doctest that doesn't work at the Sage prompt?