Landing: 486b381b7ae6

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Project / Subsystem

gcc / libgomp

Date

2026-09-01

Author

supers1ngular

Commit

486b381b7ae6c18d70b81da30b3913155e1a7960

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: libgomp
patch_id: —
commit_hash: 486b381b7ae6c18d70b81da30b3913155e1a7960
source_type: github
headline: libgomp: Add Controls For Runtime USM
tldr: Introduces an environment variable to control Unified Shared Memory (USM) usage in libgomp.
author: supers1ngular
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • libgomp
• OpenMP
• USM
• runtime
• memory management
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/486b381b7ae6c18d70b81da30b3913155e1a7960
date: 2026-09-01T00:00:00.000Z

Libgomp, the OpenMP runtime library, now offers control over Unified Shared Memory (USM) through the GOMP_RUNTIME_USM environment variable. This allows developers to explicitly enable, disable, or set USM to ‘auto’ mode, where it’s conditionally used for integrated GPUs. The change includes parsing logic for the environment variable, integration into the runtime initialization, and documentation updates. Verbose environment output also now reflects USM settings.