[cfe-dev] clang crashes when running in VM

[Robinson, Paul via cfe-dev]

There's a CMake option LLVM_PARALLEL_LINK_JOBS that you could set to something smaller than 12, try experimenting with that.
--paulr

From: cfe-dev [mailto:cfe-dev-bounces at lists.llvm.org] On Behalf Of chen hsu via cfe-dev
Sent: Wednesday, July 26, 2017 10:17 AM
To: George Burgess IV
Cc: Clang Dev
Subject: Re: [cfe-dev] clang crashes when running in VM


Thanks for replying, George.

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?

________________________________
From: George Burgess IV <george.burgess.iv at gmail.com<mailto:george.burgess.iv at gmail.com>>
Sent: Wednesday, July 26, 2017 2:20:21 AM
To: chen hsu
Cc: Clang Dev
Subject: Re: [cfe-dev] clang crashes when running in VM

Hello!

"error: unable to execute command: Killed" sounds a lot like what I
get when clang gets killed for eating all of my system's memory. Are
you sure that your VM has enough RAM to handle linking whatever it is
that you're linking?

Thanks,
George

On Tue, Jul 25, 2017 at 5:24 PM, chen hsu via cfe-dev
<cfe-dev at lists.llvm.org<mailto:cfe-dev at lists.llvm.org>> wrote:
> Hi,
>
>
> we have clang 3.6.2 on ubuntu 16.04 to build our project and it works well
> on physical machines. but when running in VM (HyperV on Windows Server
> 2012R2), it crashes quite often in linking. Is this a known issue? It seems
> possibly related to memory, as the crash happens more frequently when the
> memory size of the VM is relatively small. Thanks.
>
>
> clang-3.6: error: unable to execute command: Killed
>
> clang-3.6: error: clang frontend command failed due to signal (use -v to see
> invocation)
>
> clang version 3.6.2 (tags/RELEASE_362/final 252038)
>
> Target: x86_64-unknown-linux-gnu
>
> Thread model: posix
>
> clang-3.6: note: diagnostic msg: PLEASE submit a bug report to
> http://llvm.org/bugs/ and include the crash backtrace, preprocessed source,
> and associated run script.
>
> ********************
>
>
>
>
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