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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">There's a CMake option LLVM_PARALLEL_LINK_JOBS that you could set to something smaller than 12, try experimenting with that.<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>chen hsu via cfe-dev<br>
<b>Sent:</b> Wednesday, July 26, 2017 10:17 AM<br>
<b>To:</b> George Burgess IV<br>
<b>Cc:</b> Clang Dev<br>
<b>Subject:</b> Re: [cfe-dev] clang crashes when running in VM<o:p></o:p></span></p>
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<p><span style="font-family:"Calibri","sans-serif";color:black">Thanks for replying, George. <o:p></o:p></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">I allocated 16GB to the VM, as well as 4GB swap. Our executable/shared-library are pretty big, usually 500MB to 2GB in size with debug symbols, and we use "make -j 12" for the 6-core (12 hyperthread) CPU
to be fully used. I guess it might be due to parallel linking, the memory usage would skyrocket? Is there a graceful way to avoid this? <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"> George Burgess IV <<a href="mailto:george.burgess.iv@gmail.com">george.burgess.iv@gmail.com</a>><br>
<b>Sent:</b> Wednesday, July 26, 2017 2:20:21 AM<br>
<b>To:</b> chen hsu<br>
<b>Cc:</b> Clang Dev<br>
<b>Subject:</b> Re: [cfe-dev] clang crashes when running in VM</span> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Hello!<br>
<br>
"error: unable to execute command: Killed" sounds a lot like what I<br>
get when clang gets killed for eating all of my system's memory. Are<br>
you sure that your VM has enough RAM to handle linking whatever it is<br>
that you're linking?<br>
<br>
Thanks,<br>
George<br>
<br>
On Tue, Jul 25, 2017 at 5:24 PM, chen hsu via cfe-dev<br>
<<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br>
> Hi,<br>
><br>
><br>
> we have clang 3.6.2 on ubuntu 16.04 to build our project and it works well<br>
> on physical machines. but when running in VM (HyperV on Windows Server<br>
> 2012R2), it crashes quite often in linking. Is this a known issue? It seems<br>
> possibly related to memory, as the crash happens more frequently when the<br>
> memory size of the VM is relatively small. Thanks.<br>
><br>
><br>
> clang-3.6: error: unable to execute command: Killed<br>
><br>
> clang-3.6: error: clang frontend command failed due to signal (use -v to see<br>
> invocation)<br>
><br>
> clang version 3.6.2 (tags/RELEASE_362/final 252038)<br>
><br>
> Target: x86_64-unknown-linux-gnu<br>
><br>
> Thread model: posix<br>
><br>
> clang-3.6: note: diagnostic msg: PLEASE submit a bug report to<br>
> <a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source,<br>
> and associated run script.<br>
><br>
> ********************<br>
><br>
><br>
><br>
><br>
> _______________________________________________<br>
> cfe-dev mailing list<br>
> <a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a><br>
> <a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev">http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev</a><br>
><o:p></o:p></span></p>
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