<div dir="ltr">Doru,<div>What's the current way of enabling SM_60 CUDA architecture support for unified addressing?</div><div>It's been modified since we exchanged the message.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 7, 2019 at 4:05 AM Gheorghe-Teod Bercea <<a href="mailto:Gheorghe-Teod.Bercea@ibm.com">Gheorghe-Teod.Bercea@ibm.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style="font-size:10pt;font-family:sans-serif">Hi Itaru,</span><br><br><span style="font-size:10pt;font-family:sans-serif">We did not test
those features on an sm_60 machine like a Pascal GPU so I can't guarantee
it will work. I suggest you enable it locally and see how it performs.</span><br><span style="font-size:10pt;font-family:sans-serif">You only need
to make a small change in "void CGOpenMPRuntimeNVPTX::checkArchForUnifiedAddressing(const
OMPRequiresDecl *D)" to allow sm_60 to be accepted as a valid target.</span><br><br><span style="font-size:10pt;font-family:sans-serif">Thanks,</span><br><br><span style="font-size:10pt;font-family:sans-serif">--Doru<br></span><br><br><br><br><span style="font-size:9pt;color:rgb(95,95,95);font-family:sans-serif">From:
</span><span style="font-size:9pt;font-family:sans-serif">Itaru
Kitayama via Openmp-dev <<a href="mailto:openmp-dev@lists.llvm.org" target="_blank">openmp-dev@lists.llvm.org</a>></span><br><span style="font-size:9pt;color:rgb(95,95,95);font-family:sans-serif">To:
</span><span style="font-size:9pt;font-family:sans-serif">Alexey
Bataev <<a href="mailto:a.bataev@outlook.com" target="_blank">a.bataev@outlook.com</a>></span><br><span style="font-size:9pt;color:rgb(95,95,95);font-family:sans-serif">Cc:
</span><span style="font-size:9pt;font-family:sans-serif">openmp-dev
<<a href="mailto:openmp-dev@lists.llvm.org" target="_blank">openmp-dev@lists.llvm.org</a>></span><br><span style="font-size:9pt;color:rgb(95,95,95);font-family:sans-serif">Date:
</span><span style="font-size:9pt;font-family:sans-serif">11/05/2019
06:04 PM</span><br><span style="font-size:9pt;color:rgb(95,95,95);font-family:sans-serif">Subject:
</span><span style="font-size:9pt;font-family:sans-serif">[EXTERNAL]
Re: [Openmp-dev] Target architecture does not support unified
addressing</span><br><span style="font-size:9pt;color:rgb(95,95,95);font-family:sans-serif">Sent
by: </span><span style="font-size:9pt;font-family:sans-serif">"Openmp-dev"
<<a href="mailto:openmp-dev-bounces@lists.llvm.org" target="_blank">openmp-dev-bounces@lists.llvm.org</a>></span><br><hr noshade><br><br><br><span style="font-size:12pt">Can you say briefly as to why SM60,
while it is capable of handing unified addresses, is not supported in
Clang?</span><br><br><span style="font-size:12pt">On Wed, Nov 6, 2019 at 7:56 AM Alexey
Bataev <</span><a href="mailto:a.bataev@outlook.com" target="_blank"><span style="font-size:12pt;color:blue"><u>a.bataev@outlook.com</u></span></a><span style="font-size:12pt">>
wrote:</span><br><span style="font-size:12pt">Yes, it is enforced in clang.<br></span><br><span style="font-size:12pt">Best regards, </span><br><span style="font-size:12pt">Alexey Bataev</span><br><br><span style="font-size:12pt">5 нояб. 2019 г., в 17:38, Itaru
Kitayama <</span><a href="mailto:itaru.kitayama@gmail.com" target="_blank"><span style="font-size:12pt;color:blue"><u>itaru.kitayama@gmail.com</u></span></a><span style="font-size:12pt">>
написал(а):<br></span><br><span style="font-size:12pt"> </span><br><span style="font-size:12pt">Thank you, Alexey. Now I am seeing: </span><br><br><span style="font-size:12pt">$ clang++ -fopenmp -fopenmp-targets=nvptx64
tmp.cpp</span><br><span style="font-size:12pt">tmp.cpp:1:22: error: Target architecture
sm_60 does not support unified addressing</span><br><span style="font-size:12pt">#pragma omp requires unified_shared_memory</span><br><span style="font-size:12pt">
^</span><br><span style="font-size:12pt">1 error generated.</span><br><br><span style="font-size:12pt">P100 is a SM60 device, but supports unified
memory. Is a requirement sm_70 equals or greater</span><br><span style="font-size:12pt">enforced in Clang? </span><br><br><span style="font-size:12pt">On Wed, Nov 6, 2019 at 5:07 AM Alexey
Bataev <</span><a href="mailto:a.bataev@outlook.com" target="_blank"><span style="font-size:12pt;color:blue"><u>a.bataev@outlook.com</u></span></a><span style="font-size:12pt">>
wrote:</span><br><span style="font-size:12pt">Most probably, you use default architecture,
i.e. sm_35. You need to build clang with sm_35, sm_70, ... supported archs.
Plus, your system must support unified memory.</span><br><span style="font-size:12pt">I updated error message in the compiler,
now it says what target architecture you use .</span><br><tt><span style="font-size:12pt">-------------<br>Best regards,<br>Alexey Bataev</span></tt><br><span style="font-size:12pt">05.11.2019 3:01 PM, Itaru Kitayama пишет:</span><br><span style="font-size:12pt">I’ve been building trunk Clang locally
targeting the P100 device attached to Host. Should I check the tool chain?</span><br><br><span style="font-size:12pt">On Tue, Nov 5, 2019 at 23:47 Alexey Bataev
<</span><a href="mailto:a.bataev@outlook.com" target="_blank"><span style="font-size:12pt;color:blue"><u>a.bataev@outlook.com</u></span></a><span style="font-size:12pt">>
wrote:</span><br><span style="font-size:12pt">You're building you code for the architecture
that does not support unified memory, say sm_35. Unified memory only supported
for architectures >= sm_70. </span><br><tt><span style="font-size:12pt">-------------<br>Best regards,<br>Alexey Bataev</span></tt><br><span style="font-size:12pt">05.11.2019 3:16 AM, Itaru Kitayama via
Openmp-dev пишет:</span><br><span style="font-size:12pt">Hi, </span><br><span style="font-size:12pt">Using a pragma like below:</span><br><br><span style="font-size:12pt">$ cat tmp.cpp</span><br><span style="font-size:12pt">#pragma omp requires unified_shared_memory</span><br><br><span style="font-size:12pt">int main() {</span><br><span style="font-size:12pt">}</span><br><br><span style="font-size:12pt">produces en error on a POWER8 based system
with P100 devices (that support unified memory).</span><br><br><span style="font-size:12pt">$ clang++ -fopenmp -fopenmp-targets=nvptx64
tmp.cpp</span><br><span style="font-size:12pt">tmp.cpp:1:22: error: Target architecture
does not support unified addressing</span><br><span style="font-size:12pt">#pragma omp requires unified_shared_memory</span><br><span style="font-size:12pt">
^</span><br><span style="font-size:12pt">1 error generated.</span><br><br><span style="font-size:12pt">The Clang is locally and natively built
with the appropriate capability, so </span><br><span style="font-size:12pt">what does this mean?</span><br><br><br><tt><span style="font-size:12pt">_______________________________________________<br>Openmp-dev mailing list<br></span></tt><a href="mailto:Openmp-dev@lists.llvm.org" target="_blank"><tt><span style="font-size:12pt;color:blue"><u>Openmp-dev@lists.llvm.org</u></span></tt></a><tt><span style="font-size:12pt"><br></span></tt><a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev" target="_blank"><tt><span style="font-size:12pt;color:blue"><u>https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev</u></span></tt></a><tt><span style="font-size:12pt"><br></span></tt><tt><span style="font-size:10pt">_______________________________________________<br>Openmp-dev mailing list<br><a href="mailto:Openmp-dev@lists.llvm.org" target="_blank">Openmp-dev@lists.llvm.org</a><br></span></tt><a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev" target="_blank"><tt><span style="font-size:10pt">https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev</span></tt></a><tt><span style="font-size:10pt"><br></span></tt><br><br><br>
</blockquote></div>