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benchmark: Removed bench/perf.cpp

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This commit is contained in:
Thomas Snider 2018-04-18 19:13:10 -07:00
parent 07825088f9
commit b38200459f
4 changed files with 0 additions and 96 deletions
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2
src/Makefile.bench.include
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@ -25,8 +25,6 @@ bench_bench_bitcoin_SOURCES = \
bench/verify_script.cpp \
bench/base58.cpp \
bench/lockedpool.cpp \
bench/perf.cpp \
bench/perf.h \
bench/prevector.cpp
nodist_bench_bench_bitcoin_SOURCES = $(GENERATED_BENCH_FILES)

4
src/bench/bench.cpp
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@ -3,7 +3,6 @@
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <bench/bench.h>
#include <bench/perf.h>
#include <assert.h>
#include <iostream>
@ -96,7 +95,6 @@ benchmark::BenchRunner::BenchRunner(std::string name, benchmark::BenchFunction f
void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double scaling, const std::string& filter, bool is_list_only)
{
perf_init();
if (!std::ratio_less_equal<benchmark::clock::period, std::micro>::value) {
std::cerr << "WARNING: Clock precision is worse than microsecond - benchmarks may be less accurate!\n";
}
@ -126,8 +124,6 @@ void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double
}
printer.footer();
perf_fini();
}
bool benchmark::State::UpdateTimer(const benchmark::time_point current_time)

53
src/bench/perf.cpp
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@ -1,53 +0,0 @@
// Copyright (c) 2016-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <bench/perf.h>
#if defined(__i386__) || defined(__x86_64__)
/* These architectures support querying the cycle counter
* from user space, no need for any syscall overhead.
*/
void perf_init(void) { }
void perf_fini(void) { }
#elif defined(__linux__)
#include <unistd.h>
#include <sys/syscall.h>
#include <linux/perf_event.h>
static int fd = -1;
static struct perf_event_attr attr;
void perf_init(void)
{
attr.type = PERF_TYPE_HARDWARE;
attr.config = PERF_COUNT_HW_CPU_CYCLES;
fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
}
void perf_fini(void)
{
if (fd != -1) {
close(fd);
}
}
uint64_t perf_cpucycles(void)
{
uint64_t result = 0;
if (fd == -1 || read(fd, &result, sizeof(result)) < (ssize_t)sizeof(result)) {
return 0;
}
return result;
}
#else /* Unhandled platform */
void perf_init(void) { }
void perf_fini(void) { }
uint64_t perf_cpucycles(void) { return 0; }
#endif

37
src/bench/perf.h
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@ -1,37 +0,0 @@
// Copyright (c) 2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
/** Functions for measurement of CPU cycles */
#ifndef BITCOIN_BENCH_PERF_H
#define BITCOIN_BENCH_PERF_H
#include <stdint.h>
#if defined(__i386__)
static inline uint64_t perf_cpucycles(void)
{
uint64_t x;
__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
return x;
}
#elif defined(__x86_64__)
static inline uint64_t perf_cpucycles(void)
{
uint32_t hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ((uint64_t)lo)|(((uint64_t)hi)<<32);
}
#else
uint64_t perf_cpucycles(void);
#endif
void perf_init(void);
void perf_fini(void);
#endif // BITCOIN_BENCH_PERF_H