mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-04 15:21:04 +01:00
Chandler Carruth
523e1c2972
The `libpfm` in the Bazel central repository uses `make` to build it, which is difficult to integrate with our toolchain. Rather than try to fix all the issues there, it's easy to just add a native Bazel build for the library. I don't know that any of the relevant upstream folks are interested in this kind of build, but it seems easy for us to maintain as a Carbon project build configuration. I've also not tried to port all of the different configurations as a consequence, and only 64-bit x86 and Arm as that seems the only likely architectures we'll care about in the near term. I've kept this using the `bzlmod` stuff as best I can, and I *think* I'm holding all of those pieces correctly, but if not, happy for suggestions on adjustments. The `google_benchmark` package also has an awkward way of enabling `libpfm` support using a top-level `bazel` command line flag. I think this is because of how brittle the Bazel build of `libpfm` is, but I'm not sure. With the new build, it seems easy to patch `google_benchmark` to detect the same conditions as we build `libpfm` under, and enable it there. So I've done this to avoid folks having to pass a command line flag on platforms where it is supported. The result is that we now get really nice CPU counter support in our benchmarks out-of-the-box on Linux x86-64 and AArch64. For example on my Fedora Asahi install on a Mac Mini I get: ```console $ bazel run -c opt --copt=-gmlt //common:hashing_benchmark --run_under="taskset -c 4" -- --benchmark_counters_tabular=true --benchmark_perf_counters=CYCLES,INSTRUCTIONS INFO: Invocation ID: 4aaeb9e9-7df5-4f1f-b56b-c03411790268 INFO: Analyzed target //common:hashing_benchmark (0 packages loaded, 0 targets configured). INFO: Found 1 target... Target //common:hashing_benchmark up-to-date: bazel-bin/common/hashing_benchmark INFO: Elapsed time: 0.360s, Critical Path: 0.02s INFO: 1 process: 1 internal. INFO: Build completed successfully, 1 total action INFO: Running command line: /bin/bash -c 'taskset -c 4 bazel-bin/common/hashing_benchmark '\''--benchmark_counters_tabular=true'\'' '\''--benchmark_perf_counters=CYCLES,INSTRUCTIONS'\''' 2024-01-15T00:10:50-08:00 Running /home/chandlerc/.cache/bazel/_bazel_chandlerc/b686aa8910e0845b88c21d715819b076/execroot/_main/bazel-out/aarch64-opt/bin/common/hashing_benchmark Run on (8 X 2064 MHz CPU s) CPU Caches: L1 Data 64 KiB (x8) L1 Instruction 128 KiB (x8) L2 Unified 4096 KiB (x2) Load Average: 0.01, 0.08, 0.08 -------------------------------------------------------------------------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations CYCLES INSTRUCTIONS bytes_per_second -------------------------------------------------------------------------------------------------------------------------------------------------------------- BM_LatencyHash<RandValues<uint8_t>, CarbonHashBench> 4.11 ns 4.11 ns 170200064 13.1321 9.00587 232.116Mi/s BM_LatencyHash<RandValues<uint8_t>, AbseilHashBench> 4.82 ns 4.82 ns 145643520 15.3657 12.0059 197.946Mi/s BM_LatencyHash<RandValues<uint8_t>, LLVMHashBench> 7.96 ns 7.95 ns 87956480 25.3737 17.0068 119.991Mi/s BM_LatencyHash<RandValues<uint16_t>, CarbonHashBench> 4.11 ns 4.11 ns 170365952 13.1247 9.00587 464.573Mi/s BM_LatencyHash<RandValues<uint16_t>, AbseilHashBench> 5.51 ns 5.51 ns 127568896 17.5578 14.0059 346.225Mi/s BM_LatencyHash<RandValues<uint16_t>, LLVMHashBench> 8.00 ns 7.99 ns 87085056 25.377 17.0068 238.834Mi/s BM_LatencyHash<RandValues<std::pair<uint8_t, uint8_t>>, CarbonHashBench> 4.91 ns 4.90 ns 136013824 15.6456 14.0059 389.006Mi/s BM_LatencyHash<RandValues<std::pair<uint8_t, uint8_t>>, AbseilHashBench> 6.85 ns 6.85 ns 102630400 21.8041 18.0059 278.637Mi/s BM_LatencyHash<RandValues<std::pair<uint8_t, uint8_t>>, LLVMHashBench> 7.57 ns 7.56 ns 92798976 24.1437 20.0068 252.151Mi/s BM_LatencyHash<RandValues<uint32_t>, CarbonHashBench> 4.12 ns 4.12 ns 170229760 13.1272 9.00587 926.444Mi/s BM_LatencyHash<RandValues<uint32_t>, AbseilHashBench> 4.93 ns 4.92 ns 145304576 15.3738 12.0059 775.224Mi/s BM_LatencyHash<RandValues<uint32_t>, LLVMHashBench> 8.11 ns 8.10 ns 87127040 25.373 17.0068 470.98Mi/s ```
134 lines
4.1 KiB
Diff
134 lines
4.1 KiB
Diff
From 04fb28b5673d29a8c38519845c87f4c00c76e9cf Mon Sep 17 00:00:00 2001
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From: Chandler Carruth <chandlerc@gmail.com>
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Date: Sat, 13 Jan 2024 02:15:19 -0800
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Subject: [PATCH] Introduce a simple native Bazel build.
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---
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BUILD.bazel | 84 +++++++++++++++++++++++++++++++++++++++++++++++++
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MODULE.bazel | 10 ++++++
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WORKSPACE.bazel | 5 +++
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3 files changed, 99 insertions(+)
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create mode 100644 BUILD.bazel
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create mode 100644 MODULE.bazel
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create mode 100644 WORKSPACE.bazel
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diff --git a/BUILD.bazel b/BUILD.bazel
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new file mode 100644
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index 0000000..427c854
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--- /dev/null
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+++ b/BUILD.bazel
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@@ -0,0 +1,84 @@
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+# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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+# Exceptions. See /LICENSE for license information.
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+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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+
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+load("@rules_cc//cc:defs.bzl", "cc_library")
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+
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+package(default_visibility = ["//visibility:public"])
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+
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+aarch64_srcs = [
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+ "lib/pfmlib_arm_perf_event.c",
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+ "lib/pfmlib_arm.c",
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+ "lib/pfmlib_arm_armv8.c",
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+ "lib/pfmlib_arm_armv9.c",
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+ "lib/pfmlib_tx2_unc_perf_event.c",
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+ "lib/pfmlib_kunpeng_unc_perf_event.c",
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+ "lib/pfmlib_arm_priv.h",
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+ "lib/events/arm_cortex_a57_events.h",
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+ "lib/events/arm_cortex_a53_events.h",
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+ "lib/events/arm_xgene_events.h",
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+ "lib/events/arm_cavium_tx2_events.h",
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+ "lib/events/arm_marvell_tx2_unc_events.h",
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+ "lib/events/arm_fujitsu_a64fx_events.h",
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+ "lib/events/arm_neoverse_n1_events.h",
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+ "lib/events/arm_neoverse_n2_events.h",
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+ "lib/events/arm_neoverse_v1_events.h",
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+ "lib/events/arm_neoverse_v2_events.h",
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+ "lib/events/arm_hisilicon_kunpeng_events.h",
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+ "lib/events/arm_hisilicon_kunpeng_unc_events.h",
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+]
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+
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+x86_64_srcs = [
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+ "lib/pfmlib_amd64_priv.h",
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+] + glob(
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+ [
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+ "lib/pfmlib_amd64*.c",
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+ "lib/pfmlib_intel*.c",
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+ "lib/pfmlib_intel*_priv.h",
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+ "lib/events/amd64_events_*.h",
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+ "lib/events/intel_*_events.h",
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+ ],
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+ exclude = [
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+ # 32-bit CPUs
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+ "lib/pfmlib_intel_coreduo.c",
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+ "lib/pfmlib_intel_p6.c",
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+ ],
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+)
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+
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+cc_library(
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+ name = "libpfm",
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+ srcs = [
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+ "lib/events/perf_events.h",
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+ "lib/pfmlib_common.c",
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+ "lib/pfmlib_perf_event.c",
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+ "lib/pfmlib_perf_event_pmu.c",
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+ "lib/pfmlib_perf_event_priv.h",
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+ "lib/pfmlib_perf_event_raw.c",
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+ "lib/pfmlib_priv.h",
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+ ] + select({
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+ "@platforms//cpu:aarch64": aarch64_srcs,
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+ "@platforms//cpu:x86_64": x86_64_srcs,
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+ }),
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+ hdrs = glob(["include/perfmon/*.h"]),
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+ copts = [
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+ "-DHAS_OPENAT",
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+ "-D_REENTRANT",
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+ "-I.",
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+ "-fvisibility=hidden",
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+ ] + select({
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+ "@platforms//cpu:x86_64": [
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+ "-DCONFIG_PFMLIB_ARCH_X86",
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+ "-DCONFIG_PFMLIB_ARCH_X86_64",
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+ ],
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+ "//conditions:default": [],
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+ }),
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+ strip_include_prefix = "include",
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+ target_compatible_with = select({
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+ # This library only makes sense on Linux, and we only include support
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+ # for building on AArch64 and x86-64. Other CPUs can be added to this
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+ # list if build support is added for them.
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+ "@platforms//cpu:aarch64": ["@platforms//os:linux"],
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+ "@platforms//cpu:x86_64": ["@platforms//os:linux"],
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+ "//conditions:default": ["@platforms//:incompatible"],
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+ }),
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+)
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diff --git a/MODULE.bazel b/MODULE.bazel
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new file mode 100644
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index 0000000..c901cbe
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--- /dev/null
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+++ b/MODULE.bazel
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@@ -0,0 +1,10 @@
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+# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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+# Exceptions. See /LICENSE for license information.
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+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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+
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+"""Bazel modules."""
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+
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+module(name = "libpfm")
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+
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+bazel_dep(name = "rules_cc", version = "0.0.9")
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+bazel_dep(name = "platforms", version = "0.0.8")
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diff --git a/WORKSPACE.bazel b/WORKSPACE.bazel
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new file mode 100644
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index 0000000..9aad57c
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--- /dev/null
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+++ b/WORKSPACE.bazel
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@@ -0,0 +1,5 @@
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+# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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+# Exceptions. See /LICENSE for license information.
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+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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+
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+# See `MODULE.bazel` for details.
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--
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2.43.0
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