Public bug reported:
The large resource usage of the rustc selfbuild autopkgtest not only causes
a large, unnecessary load on our autopkgtest infrastructure, but the tests can
also sometimes run out of resources, making the autopkgtests flaky. This
flakiness problem is extra bad for tests which can take upwards of 2 hours to
run.
Currently, Rust toolchains before rustc-1.93 run the entire bootstrap process
during the selfbuild autopkgtest, including thousands of unit tests. This is
unnecessary, as we already run the unit tests during the build process itself.
Additionally, many settings which are important for optimizing the toolchain
are left on for the selfbuild autopkgtest. The performance of the toolchain
built by the autopkgtest is irrelevant, and the settings increase resource
usage, so they should be disabled as well.
Luckily, as stated above, rustc-1.93 has solved this problem by disabling
certain resource-intensive bootstrap optimizations and only running a
subset of unit tests to verify that the new toolchain is capable of testing
other toolchain builds.
The solution is to cherry-pick these fixes from rustc-1.93 in order to make
older toolchains' autopkgtests more reliable.
** Affects: rustc-1.85 (Ubuntu)
Importance: Undecided
Assignee: Max Gilmour (maxgmr)
Status: Triaged
** Affects: rustc-1.85 (Ubuntu Noble)
Importance: Undecided
Assignee: Max Gilmour (maxgmr)
Status: Triaged
** Affects: rustc-1.85 (Ubuntu Questing)
Importance: Undecided
Assignee: Max Gilmour (maxgmr)
Status: Triaged
** Affects: rustc-1.85 (Ubuntu Resolute)
Importance: Undecided
Assignee: Max Gilmour (maxgmr)
Status: Triaged
** Also affects: rustc-1.85 (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: rustc-1.85 (Ubuntu Questing)
Importance: Undecided
Status: New
** Changed in: rustc-1.85 (Ubuntu Noble)
Assignee: (unassigned) => Max Gilmour (maxgmr)
** Changed in: rustc-1.85 (Ubuntu Questing)
Assignee: (unassigned) => Max Gilmour (maxgmr)
** Also affects: rustc-1.85 (Ubuntu Resolute)
Importance: Undecided
Assignee: Max Gilmour (maxgmr)
Status: New
** Changed in: rustc-1.85 (Ubuntu Noble)
Status: New => Triaged
** Changed in: rustc-1.85 (Ubuntu Questing)
Status: New => Triaged
** Changed in: rustc-1.85 (Ubuntu Resolute)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/2144934
Title:
Selfbuild autopkgtest is flaky due to excessive resource usage
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