public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug target/104768] New: [nvptx] Exploit Independent Thread Scheduling for sm_70+
@ 2022-03-03 10:03 vries at gcc dot gnu.org
  2022-03-15 13:30 ` [Bug target/104768] " vries at gcc dot gnu.org
  0 siblings, 1 reply; 2+ messages in thread
From: vries at gcc dot gnu.org @ 2022-03-03 10:03 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104768

            Bug ID: 104768
           Summary: [nvptx] Exploit Independent Thread Scheduling for
                    sm_70+
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Starting with sm_70, a fundamental change in the architecture occurred, called 
"Independent Thread Scheduling".  It means warps threads are no longer
executing in lock-step.

We could try to exploit this in the port.

F.i., is it still necessary to emit a warp sync after a diverging branch?

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug target/104768] [nvptx] Exploit Independent Thread Scheduling for sm_70+
  2022-03-03 10:03 [Bug target/104768] New: [nvptx] Exploit Independent Thread Scheduling for sm_70+ vries at gcc dot gnu.org
@ 2022-03-15 13:30 ` vries at gcc dot gnu.org
  0 siblings, 0 replies; 2+ messages in thread
From: vries at gcc dot gnu.org @ 2022-03-15 13:30 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104768

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Hmm, reading about it a bit more, it's more about enabling algorithms that were
not possible before, than about performance improvements.

So, we should aim at having test-cases, both openacc and openmp that hang on
previous architectures but pass with sm_70+.

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-03-15 13:30 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-03-03 10:03 [Bug target/104768] New: [nvptx] Exploit Independent Thread Scheduling for sm_70+ vries at gcc dot gnu.org
2022-03-15 13:30 ` [Bug target/104768] " vries at gcc dot gnu.org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).