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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/105421] New: GCN offloading, raised
 '-mgang-private-size': 'HSA_STATUS_ERROR_MEMORY_APERTURE_VIOLATION'
Date: Thu, 28 Apr 2022 13:26:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105421

            Bug ID: 105421
           Summary: GCN offloading, raised '-mgang-private-size':
                    'HSA_STATUS_ERROR_MEMORY_APERTURE_VIOLATION'
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: openacc
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: ams at gcc dot gnu.org, jules at gcc dot gnu.org
  Target Milestone: ---
            Target: GCN

As discussed in
<http://mid.mail-archive.com/87fslzspgo.fsf@dem-tschwing-1.ger.mentorg.com>,
after commit r12-8252-gb2202431910e30d8505c94d1cb9341cac7080d10 "fortran: F=
ix
up gfc_trans_oacc_construct [PR104717]", we need commit
r12-8311-g2a570f11a2fecf23998d7fe1d5cabad62cfe5cec "Fix up
'libgomp.oacc-fortran/print-1.f90' GCN offloading compilation [PR104717]",
however:

> That only works with the default GCN multilib '-march=3Dfiji', testing
> on gfx803 amdfury2 system.  For all of '-march=3Dgfx900' (amdnano2),
> '-march=3Dgfx906' (amd_ryzen3), '-march=3Dgfx908' (amd-instinct1), I get:
>=20
>     libgomp: GCN fatal error: Asynchronous queue error
>     Runtime message: HSA_STATUS_ERROR_MEMORY_APERTURE_VIOLATION: The agen=
t attempted to access memory beyond the largest legal address.
>=20
> ..., and I still get that if lowering the allocation to the minimum,
> '-foffload-options=3Damdgcn-amdhsa=3D-mgang-private-size=3D560'.
>=20
> This is a really simple OpenACC 'parallel' construct:
>=20
>     !$acc parallel
>       write (0, '("The answer is ", I2)') var
>     !$acc end parallel
>=20
> ..., which ought to launch a 1-gang x 1-worker x 1-vector GPU kernel, so
> I'd assume '-mgang-private-size=3D560' (or '-mgang-private-size=3D13579' =
in
> fact) is not a problem?=