From: Nick Desaulniers <ndesaulniers@google.com>
To: Maksim Panchenko <maks@fb.com>
Cc: android-llvm-dev <android-llvm-dev@google.com>,
android-kernel-team <android-kernel-team@google.com>,
Yi Kong <yikong@google.com>,
clang-built-linux <llvm@lists.linux.dev>
Subject: Initial LLVM+BOLT measurements
Date: Wed, 20 Apr 2022 10:41:52 -0700 [thread overview]
Message-ID: <CAKwvOdm08hr2p-ARqmPEGnCi6zZOtgmt5d45hYG2vo30mhyMrg@mail.gmail.com> (raw)
Hi Maksim,
Just letting you know that my teammate Yi just enabled the usage of
BOLT on AOSP LLVM. [0] There are some speedups measured in building
the Android platform.
I'm more interested in kernel builds; here's some rough (N=1) initial
measurements to report:
r450784b:
$ LTO=none BUILD_CONFIG=common/build.config.gki.aarch64 /usr/bin/time
-v ./build/build.sh
...
Elapsed (wall clock) time (h:mm:ss or m:ss): 1:58.58
$ BUILD_CONFIG=common/build.config.gki.aarch64 /usr/bin/time -v ./build/build.sh
...
Elapsed (wall clock) time (h:mm:ss or m:ss): 16:50.04
r450784c:
$ $ LTO=none BUILD_CONFIG=common/build.config.gki.aarch64
/usr/bin/time -v ./build/build.sh
...
Elapsed (wall clock) time (h:mm:ss or m:ss): 1:50.64
$ BUILD_CONFIG=common/build.config.gki.aarch64 /usr/bin/time -v ./build/build.sh
Elapsed (wall clock) time (h:mm:ss or m:ss): 16:06.56
(We care more about the LTO (longer) config than non-LTO). So rough
initial measurement shows improvement of ~6.6% (non-LTO) to ~4.3%
(LTO). We'll take it! :)
[0] https://android-review.googlesource.com/c/toolchain/llvm_android/+/2058849/
--
Thanks,
~Nick Desaulniers
reply other threads:[~2022-04-20 17:42 UTC|newest]
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