Hi! On 2023-02-01T16:12:07+0100, Martin Jambor <mjam...@suse.cz> wrote: > On Thu, Oct 20 2022, Richard Biener via Gcc-patches wrote: >>> Am 20.10.2022 um 14:41 schrieb Jakub Jelinek via Gcc-patches >>> <gcc-patches@gcc.gnu.org>: >>> On Thu, Oct 20, 2022 at 12:33:28PM +0000, Michael Matz wrote: >>>>> On Thu, 20 Oct 2022, Thomas Schwinge wrote: >>>>> This had been done in >>>>> wwwdocs commit 5c7ecfb5627e412a3d142d8dc212f4cd39b3b73f >>>>> "Document deprecation of OpenMP MIC offloading in GCC 12". >>>>> >>>>> I'm sad about this, because -- in theory -- such a plugin is very useful >>>>> for offloading simulation/debugging (separate host/device memory spaces, >>>>> allow sanitizers to run on offloaded code >>>> >>>> Yeah, I think that's a _very_ useful feature, but indeed ... >>>> >>>>> (like LLVM a while ago >>>>> implemented), and so on), but all that doesn't help -- in practice -- if >>>>> nobody is maintaining that code. >>>> >>>> ... it should then be somewhat maintained properly. Maybe the >>>> MIC-specifics could be removed from the code, and it could be transformed >>>> into a "null"-offload target, as example and testing vehicle (and implying >>>> that such new liboffloadmic^H^H^Hnull would have its upstream in the GCC >>>> repo). Alas, if noone is going to do that work removing is the right >>>> choice. >>> >>> Yeah. But we really shouldn't need a large MIC specific library for that, >>> everything should be implementable with a simple portable plugin that just >>> forks + execs the offloading ELF and transfers data to/out of it etc. >>> And the config/i386/intelmic-mkoffload etc. stuff would need to be done >>> somewhere in generic code, such that we can do it for all targets. >>> Also ideally by using just the normal lto1 with some special option that >>> it acts as an offloading compiler, so that we don't need to bother with >>> building a separate offloading compiler for it. >>> True, everything guarded with #ifdef ACCEL_COMPILER etc. would need to >>> change into code guarded with some option. >> >> Might be a nice GSoC project … > > I really think it could be.
Agreed! Something like: "Separate Host Process Offloading"! (Back in October, I actually had made a TODO note to put this one onto <https://gcc.gnu.org/wiki/SummerOfCode>, but so far...) > Would any one of those involved in this > thread be willing to mentor it? I'd offer to co-mentor, but I'd rather not be the only one. I'm now off for FOSDEM, but unless someone gets it done before, I'll cook up a GSoC project idea text when I'm back, on Tuesday. Grüße Thomas ----------------- Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; Registergericht München, HRB 106955
