ch4/progress: improve the error message for progress timeout#7808
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Progress timeout is generally useful for systems to prevent unnecessary deadlocks or hangs and avoid wasting core hours. However, there is no good default value for MPIR_CVAR_PROGRESS_TIMEOUT value since some application may legitimately have long pending communications. Improve the error message so user are explained on the reason for the error and direction on how to reset MPIR_CVAR_PROGRESS_TIMEOUT.
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Pull Request Description
Progress timeout is generally useful for systems to prevent unnecessary deadlocks or hangs and avoid wasting core hours. However, there is no good default value for MPIR_CVAR_PROGRESS_TIMEOUT value since some application may legitimately have long pending communications. Improve the error message so user are explained on the reason for the error and direction on how to reset MPIR_CVAR_PROGRESS_TIMEOUT.
Author Checklist
Particularly focus on why, not what. Reference background, issues, test failures, xfail entries, etc.
Commits are self-contained and do not do two things at once.
Commit message is of the form:
module: short descriptionCommit message explains what's in the commit.
Whitespace checker. Warnings test. Additional tests via comments.
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