update results
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README.md
129
README.md
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@ -8,101 +8,72 @@ The test
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--------
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Compiles 64 small binaries with [bazel-zig-cc][1] and [llvm14][2]. The tests
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were run on an x86_64 8-core machine running Ubuntu 22.04. The llvm's sysroot
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is this:
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were run on an x86_64 8-core machine running Ubuntu 22.04.
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sha256 = "84656a6df544ecef62169cfe3ab6e41bb4346a62d3ba2a045dc5a0a2ecea94a3",
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urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz"],
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Results
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-------
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... but with extra ~8k files, so the number of files in the sysroot is exactly
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the same as in zig sdk.
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Benchmark 1: bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=local //...
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Time (mean ± σ): 9.257 s ± 0.287 s [User: 0.083 s, System: 0.026 s]
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Range (min … max): 8.818 s … 9.515 s 5 runs
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Baseline
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--------
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Benchmark 2: bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=local //...
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Time (mean ± σ): 9.613 s ± 0.214 s [User: 0.077 s, System: 0.038 s]
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Range (min … max): 9.418 s … 9.866 s 5 runs
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Baseline llvm14 without sandbox: 12 seconds:
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Benchmark 3: bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=sandboxed --experimental_reuse_sandbox_directories //...
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Time (mean ± σ): 13.314 s ± 0.201 s [User: 0.109 s, System: 0.028 s]
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Range (min … max): 13.093 s … 13.536 s 5 runs
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bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --spawn_strategy=local --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 13.268s, Critical Path: 1.19s
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Benchmark 4: bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=sandboxed --experimental_reuse_sandbox_directories //...
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Time (mean ± σ): 13.829 s ± 0.376 s [User: 0.093 s, System: 0.046 s]
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Range (min … max): 13.573 s … 14.489 s 5 runs
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zig cc without the sandbox. 15 seconds:
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Benchmark 5: bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=sandboxed //...
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Time (mean ± σ): 35.101 s ± 0.365 s [User: 0.103 s, System: 0.028 s]
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Range (min … max): 34.747 s … 35.673 s 5 runs
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bazel build --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 23.836s, Critical Path: 3.47s
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Benchmark 6: bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=sandboxed //...
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Time (mean ± σ): 21.071 s ± 0.378 s [User: 0.091 s, System: 0.034 s]
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Range (min … max): 20.611 s … 21.635 s 5 runs
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Cost of Sandbox
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---------------
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llvm 14:
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bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 89.776s, Critical Path: 12.01s
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zig cc:
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bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 58.919s, Critical Path: 8.38s
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Possible mitigation: Sandboxfs
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------------------------------
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No dice.
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llvm 14: does not build at all:
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$ bazel build --experimental_sandboxfs_path=sandboxfs --experimental_use_sandboxfs --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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ERROR: /code/test-zigcc/BUILD:4:14: Compiling main.cc failed: (Exit 5): cc_wrapper.sh failed: error executing command external/llvm_toolchain_with_sysroot/bin/cc_wrapper.sh -U_FORTIFY_SOURCE '--target=x86_64-unknown-linux-gnu' -U_FORTIFY_SOURCE -fstack-protector -fno-omit-frame-pointer -fcolor-diagnostics -Wall ... (remaining 29 arguments skipped)
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Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
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ERROR: could not find clang; PWD="/proc/self/cwd"; PATH="<...>".
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Target //:zigzag-0 failed to build
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Use --verbose_failures to see the command lines of failed build steps.
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INFO: Elapsed time: 7.578s, Critical Path: 0.26s
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INFO: 3 processes: 3 internal.
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FAILED: Build did NOT complete successfully
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Summary
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'bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=local //...' ran
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1.04 ± 0.04 times faster than 'bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=local //...'
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1.44 ± 0.05 times faster than 'bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=sandboxed --experimental_reuse_sandbox_directories //...'
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1.49 ± 0.06 times faster than 'bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=sandboxed --experimental_reuse_sandbox_directories //...'
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2.28 ± 0.08 times faster than 'bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=sandboxed //...'
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3.79 ± 0.12 times faster than 'bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=sandboxed //...'
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zig cc:
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| Command | Mean [s] | Min [s] | Max [s] | Relative |
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|:---|---:|---:|---:|---:|
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| `bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=local //...` | 9.257 ± 0.287 | 8.818 | 9.515 | 1.00 |
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| `bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=local //...` | 9.613 ± 0.214 | 9.418 | 9.866 | 1.04 ± 0.04 |
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| `bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=sandboxed --experimental_reuse_sandbox_directories //...` | 13.314 ± 0.201 | 13.093 | 13.536 | 1.44 ± 0.05 |
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| `bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=sandboxed --experimental_reuse_sandbox_directories //...` | 13.829 ± 0.376 | 13.573 | 14.489 | 1.49 ± 0.06 |
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| `bazel build --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux --spawn_strategy=sandboxed //...` | 35.101 ± 0.365 | 34.747 | 35.673 | 3.79 ± 0.12 |
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| `bazel build --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 --spawn_strategy=sandboxed //...` | 21.071 ± 0.378 | 20.611 | 21.635 | 2.28 ± 0.08 |
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bazel build --experimental_sandboxfs_path=sandboxfs --experimental_use_sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_sandboxfs_path=sandboxfs --experimental_use_sandboxfs --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 126.613s, Critical Path: 17.63s
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Possible mitigation: `--experimental_reuse_sandbox_directories`
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---------------------------------------------------------------
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Dice.
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llvm 14:
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bazel build --experimental_reuse_sandbox_directories --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_reuse_sandbox_directories --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux ...
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INFO: Elapsed time: 18.335s, Critical Path: 2.00s
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zig cc:
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bazel build --experimental_reuse_sandbox_directories --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 //:zigzag-0
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bazel clean; bazel shutdown
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bazel --batch build --experimental_reuse_sandbox_directories --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28 ...
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INFO: Elapsed time: 34.777s, Critical Path: 4.71s
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Explanation:
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* `--spawn_strategy=local` is the baseline. This is the fastest possible
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approach (no sandbox), but does never runs in production.
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* `--spawn_strategy=sandboxed` is the default for Bazel. This is what happens
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if one does not pass any arguments.
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* `--spawn_strategy=sandboxed --experimental_reuse_sandbox_directories` is an
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optimization which is meaningful on sandboxes with many files. As of Bazel 6
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this has been [promoted to stable][3], so safe to use and, as one can see in
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the numbers, recommended with both bazel-zig-cc and a nontrivial sysroot. As
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a result, this is the most important benchmark to look at.
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Flame graphs and discussion
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---------------------------
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Flame graphs and more tests are in results/. As of 2022-12-11 most of the
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overhead comes from creating and deleting the sandboxes.
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Flame graphs in results/. Only of historical interest, because the original
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performance issues have been resolved with a combination of zig and
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bazel-zig-cc changes.
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[1]: https://sr.ht/~motiejus/bazel-zig-cc
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[2]: https://github.com/grailbio/bazel-toolchain
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[3]: https://github.com/bazelbuild/bazel/issues/16138
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@ -1,13 +1,23 @@
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#!/bin/bash
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set -xeuo pipefail
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# set to 1 to enable profiling
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profile=
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_build() {
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if [[ "$profile" == 1 ]]; then
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perf=(perf record --call-graph=dwarf -g -o "$HOME/$name.data")
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else
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perf=()
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fi
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name=$1
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shift
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bazel build --color=no --curses=no "$@" //:zigzag-0
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bazel clean --color=no --curses=no
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bazel shutdown --color=no --curses=no
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perf record --call-graph=dwarf -g -o "$HOME/$name.data" bazel --batch build --color=no --curses=no "$@" ...
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( "${perf[@]}" bazel --batch build --color=no --curses=no "$@" ... ) |& \
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tee "results/${name}.log"
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}
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_build zigcc-nosandbox --spawn_strategy=local --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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@ -17,7 +27,9 @@ _build llvm --extr
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_build zigcc-reuse-sandbox-dirs --experimental_reuse_sandbox_directories --platforms=@zig_sdk//libc_aware/platform:linux_amd64_gnu.2.28
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_build llvm-reuse-sandbox-dirs --experimental_reuse_sandbox_directories --extra_toolchains=@llvm_toolchain_with_sysroot//:cc-toolchain-x86_64-linux
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if [[ $profile == 1 ]]; then
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for d in $HOME/*.data; do
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f=$(basename "$d")
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echo "perf script -i $d | inferno-collapse-perf | inferno-flamegraph > results/${f%data}svg"
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done | parallel -v --eta
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fi
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