[cfe-dev] [LLVMdev] RFC: Upcoming Build System Changes
Joerg Sonnenberger
joerg at britannica.bec.de
Tue Nov 1 16:53:29 PDT 2011
On Tue, Nov 01, 2011 at 06:27:35PM -0500, David A. Greene wrote:
> Here is actual data comparing an empty LLVM build done recursively (the
> LLVM build) and non-recursively (the Cray build).
>
> See this?
>
> 0inputs+0outputs (0major+671804minor)pagefaults 0swaps
>
> vs. this?
>
> 0inputs+0outputs (0major+184605minor)pagefaults 0swaps
>
> That's I/O.
Sorry to disappoint you, but no, this isn't I/O. You have just shown
that a LLVM build touches more mmap'd pages.
Joerg
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