121dd9ea01
This program benchmarks concurrent epoll_wait(2) for file descriptors
that are monitored with with EPOLLIN along various semantics, by a
single epoll instance. Such conditions can be found when using
single/combined or multiple queuing when load balancing.
Each thread has a number of private, nonblocking file descriptors,
referred to as fdmap. A writer thread will constantly be writing to the
fdmaps of all threads, minimizing each threads's chances of epoll_wait
not finding any ready read events and blocking as this is not what we
want to stress. Full details in the start of the C file.
Committer testing:
# perf bench
Usage:
perf bench [<common options>] <collection> <benchmark> [<options>]
# List of all available benchmark collections:
sched: Scheduler and IPC benchmarks
mem: Memory access benchmarks
numa: NUMA scheduling and MM benchmarks
futex: Futex stressing benchmarks
epoll: Epoll stressing benchmarks
all: All benchmarks
# perf bench epoll
# List of available benchmarks for collection 'epoll':
wait: Benchmark epoll concurrent epoll_waits
all: Run all futex benchmarks
# perf bench epoll wait
# Running 'epoll/wait' benchmark:
Run summary [PID 19295]: 3 threads monitoring on 64 file-descriptors for 8 secs.
[thread 0] fdmap: 0xdaa650 ... 0xdaa74c [ 328241 ops/sec ]
[thread 1] fdmap: 0xdaa900 ... 0xdaa9fc [ 351695 ops/sec ]
[thread 2] fdmap: 0xdaabb0 ... 0xdaacac [ 381423 ops/sec ]
Averaged 353786 operations/sec (+- 4.35%), total secs = 8
#
Committer notes:
Fix the build on debian:experimental-x-mips, debian:experimental-x-mipsel
and others:
CC /tmp/build/perf/bench/epoll-wait.o
bench/epoll-wait.c: In function 'writerfn':
bench/epoll-wait.c:399:12: error: format '%ld' expects argument of type 'long int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
printinfo("exiting writer-thread (total full-loops: %ld)\n", iter);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~
bench/epoll-wait.c:86:31: note: in definition of macro 'printinfo'
do { if (__verbose) { printf(fmt, ## arg); fflush(stdout); } } while (0)
^~~
cc1: all warnings being treated as errors
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Jason Baron <jbaron@akamai.com> <jbaron@akamai.com>
Link: http://lkml.kernel.org/r/20181106152226.20883-2-dave@stgolabs.net
Link: http://lkml.kernel.org/r/20181106182349.thdkpvshkna5vd7o@linux-r8p5>
[ Applied above fixup as per Davidlohr's request ]
[ Use inttypes.h to print rlim_t fields, fixing the build on Alpine Linux / musl libc ]
[ Check if eventfd() is available, i.e. if HAVE_EVENTFD is defined ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef BENCH_H
|
|
#define BENCH_H
|
|
|
|
/*
|
|
* The madvise transparent hugepage constants were added in glibc
|
|
* 2.13. For compatibility with older versions of glibc, define these
|
|
* tokens if they are not already defined.
|
|
*
|
|
* PA-RISC uses different madvise values from other architectures and
|
|
* needs to be special-cased.
|
|
*/
|
|
#ifdef __hppa__
|
|
# ifndef MADV_HUGEPAGE
|
|
# define MADV_HUGEPAGE 67
|
|
# endif
|
|
# ifndef MADV_NOHUGEPAGE
|
|
# define MADV_NOHUGEPAGE 68
|
|
# endif
|
|
#else
|
|
# ifndef MADV_HUGEPAGE
|
|
# define MADV_HUGEPAGE 14
|
|
# endif
|
|
# ifndef MADV_NOHUGEPAGE
|
|
# define MADV_NOHUGEPAGE 15
|
|
# endif
|
|
#endif
|
|
|
|
int bench_numa(int argc, const char **argv);
|
|
int bench_sched_messaging(int argc, const char **argv);
|
|
int bench_sched_pipe(int argc, const char **argv);
|
|
int bench_mem_memcpy(int argc, const char **argv);
|
|
int bench_mem_memset(int argc, const char **argv);
|
|
int bench_futex_hash(int argc, const char **argv);
|
|
int bench_futex_wake(int argc, const char **argv);
|
|
int bench_futex_wake_parallel(int argc, const char **argv);
|
|
int bench_futex_requeue(int argc, const char **argv);
|
|
/* pi futexes */
|
|
int bench_futex_lock_pi(int argc, const char **argv);
|
|
|
|
int bench_epoll_wait(int argc, const char **argv);
|
|
|
|
#define BENCH_FORMAT_DEFAULT_STR "default"
|
|
#define BENCH_FORMAT_DEFAULT 0
|
|
#define BENCH_FORMAT_SIMPLE_STR "simple"
|
|
#define BENCH_FORMAT_SIMPLE 1
|
|
|
|
#define BENCH_FORMAT_UNKNOWN -1
|
|
|
|
extern int bench_format;
|
|
extern unsigned int bench_repeat;
|
|
|
|
#ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
|
|
#include <pthread.h>
|
|
#include <linux/compiler.h>
|
|
static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr __maybe_unused,
|
|
size_t cpusetsize __maybe_unused,
|
|
cpu_set_t *cpuset __maybe_unused)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif
|