OpenBLAS 0.3.5 memory leak on Cygwin

[embray]

I discovered that part of the problem I've been having with OpenBLAS is that there is a pretty severe memory leak that gets worse any time an application with OpenBLAS loaded in it forks.

Upstream issue: OpenMathLib/OpenBLAS#2063

Upstream PR: OpenMathLib/OpenBLAS#2064

I already have a patch that I'll posting a PR for shortly, and would like to include in Sage. I'm just testing the patch now with Sage.

Component: porting: Cygwin

Author: Erik Bray

Branch/Commit: ee6e4a3

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/27509

[embray]

Author: Erik Bray

[embray]

Branch: u/embray/ticket-27509

[embray]

comment:3

If we can still have this one last patch applied for 8.7 that would be ideal, as this is a fairly bad issue. But it only especially becomes an issue when building and running the tests; probably less so in normal usage where running many subprocesses is slightly less common (except for some areas). I can possibly apply the patch and build openblas manually if absolute need be.

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New commits:

ee6e4a3

Trac #27509: Add patch from upstream pull request to fix memory leak on Cygwin

[embray]

Commit: ee6e4a3

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

comment:4

Accepted upstream, so good for Sage.

[embray]

comment:6

This is definitely a blocker.

[embray]

comment:7

If need be I can still do something manually, but as far as I'm concerned it's still a severe problem.

[embray]

comment:8

Moving all blocker/critical issues from 8.7 to 8.8.

[vbraun]

Changed branch from u/embray/ticket-27509 to ee6e4a3