[Bug fortran/125584] gfortran.dg/corray tests may use excessive space in /tmp

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125584

--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Rainer Orth <ro@gcc.gnu.org>:

https://gcc.gnu.org/g:a5c24db958b97c6f804636a1c8d0b25b4b167702

commit r17-1587-ga5c24db958b97c6f804636a1c8d0b25b4b167702
Author: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Date:   Tue Jun 16 14:04:04 2026 +0200

    testsuite: Limit shared memory use of coarray tests [PR125584]

    As discussed in PR testsuite/125584, the gfortran.dg/coarray tests with
    -lcaf_shmem require excessive amounts of backing store for their shared
    memory images: for 64-bit tests, each test uses 4 GB images.

    On Solaris, the mapped files reside in /tmp/.LIBRT/SHM, which is tmpfs.
    During parallel testing, several such tests can run in parallel, leading
    to excessive VM use, in particular on targets like Solaris that don't
    use lazy allocation.  This is unacceptable since the testsuite defaults
    need to be safe for all targets.

    The tests PASS just fine when limiting GFORTRAN_SHARED_MEMORY_SIZE to 2M
    instead.  To allow for testing with either the default or a different
    size, setting GCC_TEST_RUN_EXPENSIVE to a non-empty string allows to
    override this.

    Tested on amd64-pc-solaris2.11 and x86_64-pc-linux-gnu.

    2026-06-13  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

            gcc/testsuite:
            PR testsuite/125584
            * gfortran.dg/coarray/caf.exp: Default GFORTRAN_SHARED_MEMORY_SIZE
            to 2 MB unless running expensive tests.