[llvm-dev] LTO query

[Teresa Johnson via llvm-dev]

I'm not completely sure what you are asking. Are you looking for
performance benchmarks to use for LTO and ThinLTO testing? Or are you
asking how to build/run with LTO and ThinLTO? Are you asking how to run
LLVM's performance test-suite with LTO and ThinLTO?

Teresa

On Fri, May 11, 2018 at 5:21 AM Siddharth Shankar Swain <
h2015096 at pilani.bits-pilani.ac.in> wrote:

> 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
>>
>
>

-- 
Teresa Johnson |  Software Engineer |  tejohnson at google.com |  408-460-2413
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