Release GIL around blocking oneMKL calls in BLAS/LAPACK - #3027
Merged
antonwolfy merged 13 commits intoAug 18, 2026
Conversation
potrf, getrf, geqrf, gesv, gesvd, heevd, syevd, ungqr and the BLAS dot/gemm family block the calling thread for the whole oneMKL call while holding the GIL. That stalls every other Python thread, including the host tasks dpnp queues to manage object lifetimes, which reacquire the GIL to drop references. Completes the backport of IntelPythongh-2850, which applied the same fix to orgqr.cpp; gesv_batch, gesvd_batch, heevd_batch and syevd_batch already had it.
abagusetty
requested review from
antonwolfy,
ndgrigorian and
vlad-perevezentsev
as code owners
August 14, 2026 17:16
potrf, getrf, geqrf, gesv, gesvd, heevd, syevd, ungqr and the BLAS dot/gemm family block the calling thread for the whole oneMKL call while holding the GIL. That stalls every other Python thread, including the host tasks dpnp queues to manage object lifetimes, which reacquire the GIL to drop references. Completes the backport of IntelPythongh-2850, which applied the same fix to orgqr.cpp; gesv_batch, gesvd_batch, heevd_batch and syevd_batch already had it.
…usetty/dpnp into fix/gil-release-blas-lapack
|
Can one of the admins verify this patch? |
ndgrigorian
reviewed
Aug 14, 2026
Collaborator
|
No base build to compare — abagusetty:fix/gil-release-blas-lapack into IntelPython:master |
antonwolfy
reviewed
Aug 17, 2026
…usetty/dpnp into fix/gil-release-blas-lapack
antonwolfy
approved these changes
Aug 18, 2026
antonwolfy
left a comment
antonwolfy
left a comment
Contributor
There was a problem hiding this comment.
Thank you @abagusetty for contributing the complete fix, LGTM
github-actions Bot
added a commit
that referenced
this pull request
Aug 18, 2026
potrf, getrf, geqrf, gesv, gesvd, heevd, syevd, ungqr and the BLAS dot/gemm family block the calling thread for the whole oneMKL call while holding the GIL. That stalls every other Python thread, including the host tasks dpnp queues to manage object lifetimes, which reacquire the GIL to drop references. Completes the backport of #2850, which applied the same fix to orgqr.cpp; gesv_batch, gesvd_batch, heevd_batch and syevd_batch already had it. 7a2714b
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
potrf, getrf, geqrf, gesv, gesvd, heevd, syevd, ungqr and the BLAS dot/gemm family block the calling thread for the whole oneMKL call while holding the GIL. That stalls every other Python thread, including the host tasks dpnp queues to manage object lifetimes, which reacquire the GIL to drop references.
Completes the backport of #2850, which applied the same fix to orgqr.cpp; gesv_batch, gesvd_batch, heevd_batch and syevd_batch already had it.