CODEWITHSUNDEEP
cudacompiler-optimizationnvcccompiler-optionslto
einpoklum
einpoklum

Reputation: 131435

Link-time optimizations in CUDA 11 - what are they and how to use them?

The CUDA 11 features announcement, it's said that there are now:

New link time optimization capabilities

what link-time optimizations does nvcc actually employ (e.g. relative to the LTO capabilities in host-side code with g++ or clang++)?

Also - is there something one needs to do to get LTO enabled, or does it always occur (unlike with host-side code where you need to compile with an -flto switch?

Upvotes: 4

Views: 992

Answers (2)

Yuxiang Lin
Yuxiang Lin

Reputation: 1

my guess is that -dlto has to be with compile time and link time, if you link your program using non-nvcc, such as gcc or g++, then you may not get the best performance

Upvotes: 0

einpoklum
einpoklum

Reputation: 131435

Partial answer:

To enable link-time optimization, use --dlink-time-opt (or dlto) when invoking the NVCC compiler, both for compilation and for device-side code linking. No (link-time) optimization will be applied if the compiler can't find the relevant intermediate information.

Upvotes: 2

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