[llvm-dev] Recommended computer resources to build llvm

Wink Saville via llvm-dev
Tue, 06 Sep 2016 22:22:54 -0000

I'll try with the *_DYLIB on, txs.

On Tue, Sep 6, 2016 at 3:05 PM, Alexandre Isoard
<alexandre.isoard at gmail.com> wrote:
> I build llvm with -j 4 without swapping with 16 GB of RAM. I build it with
> LLVM_ENABLE_DYLIB and LLVM_LINK_DYLIB which is probably helping.
>
> The amount of RAM consumed is proportional to the number of parallel build
> process. Also swapping does not necessarily slow down compilation: the OS
> can swap slow process to use more RAM as a file cache if beneficial.
> Swapping with -j 12 should be faster than not swapping with -j 2 as you are
> guaranteed to max out the usage of RAM.
>
> On Tue, Sep 6, 2016 at 10:54 PM, Wink Saville via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>>
>> I've got a i7 with 12 logical cores and 16GB of RAM I successfully
>> built RELEASE_390/final but for the last 100 or so files I'd to use
>> "ninja -j2" so as not to keep from swapping in the best case
and and
>> in the worst case the build kills itself without completing because
>> apparently its run out of memory.
>>
>> For the first 3200 files or so it was doing just fine with
"ninja"
>> which is probably "ninja -j12" but as I said for the last 100
or so
>> files I had to use "ninja -j2" to get it to complete.
>>
>> So what is the recommended computer resources, and I guess RAM size in
>> particular, for building llvm "quickly"?
>>
>> -- wink
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>
>
> --
> Alexandre Isoard