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Motiejus Jakštys 2022-12-20 12:56:17 +02:00
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@ -10,6 +10,24 @@ The test
Compiles 64 small binaries with [bazel-zig-cc][1] and [llvm14][2]. The tests
were run on an x86_64 8-core machine running Ubuntu 22.04.
TLDR
----
Extracting the fastest meaningful benchmarks in all categories (from the
section below):
'bazel build --experimental_reuse_sandbox_directories //...' ran
2.77 ± 0.08 times faster than 'bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --experimental_reuse_sandbox_directories //...'
2.85 ± 0.07 times faster than 'bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --experimental_reuse_sandbox_directories //...'
This demonstrates that **adding a hermetic toolchain to a project caused 177%
slowdown on this project**. Note that we are not counting `llvm_toolchain//...`
as a real toolchain -- one needs a sysroot to compile anything meaningful
anyway (which zig bundles with the compiler).
Once we have determined that a hermetic C++ toolchain is required, bazel-zig-cc
is about 2.8% slower than its contender plain llvm14.
Results
-------
@ -105,21 +123,6 @@ Explanation:
recommended with both bazel-zig-cc and a nontrivial sysroot. As a result,
this is the most important benchmark to look at.
Extracting the fastest meaningful benchmarks in all categories:
'bazel build --experimental_reuse_sandbox_directories //...' ran
2.77 ± 0.08 times faster than 'bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --experimental_reuse_sandbox_directories //...'
2.85 ± 0.07 times faster than 'bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --experimental_reuse_sandbox_directories //...'
This demonstrates that **adding a hermetic toolchain to a project caused 177%
slowdown on this project**. Note that we are not counting `llvm_toolchain//...`
as a real toolchain -- one needs a sysroot to compile anything meaningful
anyway (which zig bundles with the compiler).
Once we have determined that a hermetic C++ toolchain is required, bazel-zig-cc
is about 2.8% slower than its contender plain llvm14.
Flame graphs and discussion
---------------------------