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https://github.com/Gericom/teak-llvm.git
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aba80d0734
Summary:
This patch adds a benchmarking infrastructure for llvm-libc memory functions.
In a nutshell, the code can benchmark small and large buffers for the memcpy, memset and memcmp functions.
It also produces graphs of size vs latency by running targets of the form `render-libc-{memcpy|memset|memcmp}-benchmark-{small|big}`.
The configurations are provided as JSON files and the benchmark also produces a JSON file.
This file is then parsed and rendered as a PNG file via the `render.py` script (make sure to run `pip3 install matplotlib scipy numpy`).
The script can take several JSON files as input and will superimpose the curves if they are from the same host.
TODO:
- The code benchmarks whatever is available on the host but should be configured to benchmark the -to be added- llvm-libc memory functions.
- Add a README file with instructions and rationale.
- Produce scores to track the performance of the functions over time to allow for regression detection.
Reviewers: sivachandra, ckennelly
Subscribers: mgorny, MaskRay, libc-commits
Tags: #libc-project
Differential Revision: https://reviews.llvm.org/D72516
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
//===-------- `Benchmark` function ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "LibcBenchmark.h"
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#include "llvm/Support/Host.h"
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namespace llvm {
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namespace libc_benchmarks {
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void checkRequirements() {
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const auto &CpuInfo = benchmark::CPUInfo::Get();
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if (CpuInfo.scaling_enabled)
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report_fatal_error(
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"CPU scaling is enabled, the benchmark real time measurements may be "
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"noisy and will incur extra overhead.");
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}
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HostState HostState::get() {
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const auto &CpuInfo = benchmark::CPUInfo::Get();
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HostState H;
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H.CpuFrequency = CpuInfo.cycles_per_second;
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H.CpuName = llvm::sys::getHostCPUName().str();
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for (const auto &BenchmarkCacheInfo : CpuInfo.caches) {
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CacheInfo CI;
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CI.Type = BenchmarkCacheInfo.type;
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CI.Level = BenchmarkCacheInfo.level;
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CI.Size = BenchmarkCacheInfo.size;
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CI.NumSharing = BenchmarkCacheInfo.num_sharing;
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H.Caches.push_back(std::move(CI));
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}
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return H;
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}
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} // namespace libc_benchmarks
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} // namespace llvm
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