[llvm-dev] LTO query

[Siddharth Shankar Swain via llvm-dev]

Hi,
Thanks for the info, If i only want to run performance test on benchmarks
for LTO and Thin LTO enabled target, Can u suggest ways to do it ? I want
to do it at my end.
Thanks,
Siddharth

On Wed, May 2, 2018 at 7:03 PM, Teresa Johnson <tejohnson at google.com> wrote:

> I've only measured performance on x86. There are some old results for SPEC
> cpu2006 in the blog post here:
>    http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html
> The benefit is benchmark dependent, e.g. small benchmarks often don't
> improve much as they don't require whole program optimizations.
>
> We've improved the ThinLTO optimizations since then, but I don't have any
> current numbers for SPEC handy.
>
> Note that the performance is higher if you combine with PGO as the two
> techniques are complementary. I would say 5-10% improvement is pretty
> common (when measured on top of PGO), for codes that can benefit from whole
> program / cross-module optimizations.
>
> Teresa
>
> On Tue, May 1, 2018 at 12:12 PM, Siddharth Shankar Swain via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi all,
>> We have enabled Thin LTO and LTO for a specific target architecture. What
>> can be the possible scopes of improvement depending on the target  after we
>> enable the basic LTO and thin LTO.?
>> Thanks,
>> Siddharth
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
>
> --
> Teresa Johnson |  Software Engineer |  tejohnson at google.com |
>  408-460-2413
>
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