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Date: Mon, 17 Oct 2016 11:38:21 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 2/2] perf bench futex: add NUMA support
Em Sun, Oct 16, 2016 at 09:08:03PM +0200, Sebastian Andrzej Siewior escreveu:
> By default the application uses malloc() and all available CPUs. This
> patch introduces NUMA support which means:
> - memory is allocated node local via numa_alloc_local()
> - all CPUs of the specified NUMA node are used. This is also true if the
> number of threads set is greater than the number of CPUs available on
> this node.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
> tools/perf/bench/Build | 4 ++
> tools/perf/bench/futex-hash.c | 87 ++++++++++++++++++++++++++++++++++++++-----
> 2 files changed, 81 insertions(+), 10 deletions(-)
>
> diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build
> index 60bf11943047..9e6e518d7d62 100644
> --- a/tools/perf/bench/Build
> +++ b/tools/perf/bench/Build
> @@ -1,3 +1,7 @@
> +ifdef CONFIG_NUMA
> +CFLAGS_futex-hash.o += -DCONFIG_NUMA=1
> +endif
Jiri, do we really need this? I.e. aren't the CONFIG_FOO defines
available to tools?
> perf-y += sched-messaging.o
> perf-y += sched-pipe.o
> perf-y += mem-functions.o
> diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
> index d9e5e80bb4d0..8db4a5bd6a4e 100644
> --- a/tools/perf/bench/futex-hash.c
> +++ b/tools/perf/bench/futex-hash.c
> @@ -25,6 +25,9 @@
>
> #include <err.h>
> #include <sys/time.h>
> +#ifdef CONFIG_NUMA
> +#include <numa.h>
> +#endif
>
> static unsigned int nthreads = 0;
> static unsigned int nsecs = 10;
> @@ -32,6 +35,7 @@ static unsigned int nsecs = 10;
> static unsigned int nfutexes = 1024;
> static bool fshared = false, done = false, silent = false;
> static int futex_flag = 0;
> +static int numa_node = -1;
>
> struct timeval start, end, runtime;
> static pthread_mutex_t thread_lock;
> @@ -55,9 +59,28 @@ static const struct option options[] = {
> OPT_UINTEGER('f', "futexes", &nfutexes, "Specify amount of futexes per threads"),
> OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
> OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
> +#ifdef CONFIG_NUMA
> + OPT_INTEGER( 'n', "numa", &numa_node, "Specify the NUMA node"),
> +#endif
> OPT_END()
> };
>
> +#ifndef CONFIG_NUMA
> +static int numa_run_on_node(int node __maybe_unused) { return 0; }
> +static int numa_node_of_cpu(int node __maybe_unused) { return 0; }
> +static void *numa_alloc_local(size_t size) { return malloc(size); }
> +static void numa_free(void *p, size_t size __maybe_unused) { return free(p); }
> +#endif
> +
> +static bool cpu_is_local(int cpu)
> +{
> + if (numa_node < 0)
> + return true;
> + if (numa_node_of_cpu(cpu) == numa_node)
> + return true;
> + return false;
> +}
> +
> static const char * const bench_futex_hash_usage[] = {
> "perf bench futex hash <options>",
> NULL
> @@ -123,6 +146,8 @@ int bench_futex_hash(int argc, const char **argv,
> unsigned int i, ncpus;
> pthread_attr_t thread_attr;
> struct worker *worker = NULL;
> + char *node_str = NULL;
> + unsigned int cpunum;
>
> argc = parse_options(argc, argv, options, bench_futex_hash_usage, 0);
> if (argc) {
> @@ -136,18 +161,50 @@ int bench_futex_hash(int argc, const char **argv,
> act.sa_sigaction = toggle_done;
> sigaction(SIGINT, &act, NULL);
>
> - if (!nthreads) /* default to the number of CPUs */
> - nthreads = ncpus;
> + if (!nthreads) {
> + /* default to the number of CPUs per NUMA node */
> + if (numa_node < 0) {
> + nthreads = ncpus;
> + } else {
> + for (i = 0; i < ncpus; i++) {
> + if (cpu_is_local(i))
> + nthreads++;
> + }
> + if (!nthreads)
> + err(EXIT_FAILURE, "No online CPUs for this node");
> + }
> + } else {
> + int cpu_available = 0;
>
> - worker = calloc(nthreads, sizeof(*worker));
> + for (i = 0; i < ncpus && !cpu_available; i++) {
> + if (cpu_is_local(i))
> + cpu_available = 1;
> + }
> + if (!cpu_available)
> + err(EXIT_FAILURE, "No online CPUs for this node");
> + }
> +
> + if (numa_node >= 0) {
> + ret = numa_run_on_node(numa_node);
> + if (ret < 0)
> + err(EXIT_FAILURE, "numa_run_on_node");
> + ret = asprintf(&node_str, " on node %d", numa_node);
> + if (ret < 0)
> + err(EXIT_FAILURE, "numa_node, asprintf");
> + }
> +
> + worker = numa_alloc_local(nthreads * sizeof(*worker));
> if (!worker)
> goto errmem;
>
> if (!fshared)
> futex_flag = FUTEX_PRIVATE_FLAG;
>
> - printf("Run summary [PID %d]: %d threads, each operating on %d [%s] futexes for %d secs.\n\n",
> - getpid(), nthreads, nfutexes, fshared ? "shared":"private", nsecs);
> + printf("Run summary [PID %d]: %d threads%s, each operating on %d [%s] futexes for %d secs.\n\n",
> + getpid(), nthreads,
> + node_str ? : "",
> + nfutexes, fshared ? "shared":"private",
> + nsecs);
>
> init_stats(&throughput_stats);
> pthread_mutex_init(&thread_lock, NULL);
> @@ -157,14 +214,24 @@ int bench_futex_hash(int argc, const char **argv,
> threads_starting = nthreads;
> pthread_attr_init(&thread_attr);
> gettimeofday(&start, NULL);
> - for (i = 0; i < nthreads; i++) {
> + for (cpunum = 0, i = 0; i < nthreads; i++, cpunum++) {
> +
> + do {
> + if (cpu_is_local(cpunum))
> + break;
> + cpunum++;
> + if (cpunum > ncpus)
> + cpunum = 0;
> + } while (1);
> +
> worker[i].tid = i;
> - worker[i].futex = calloc(nfutexes, sizeof(*worker[i].futex));
> + worker[i].futex = numa_alloc_local(nfutexes *
> + sizeof(*worker[i].futex));
> if (!worker[i].futex)
> goto errmem;
>
> CPU_ZERO(&cpu);
> - CPU_SET(i % ncpus, &cpu);
> + CPU_SET(cpunum % ncpus, &cpu);
>
> ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu);
> if (ret)
> @@ -211,12 +278,12 @@ int bench_futex_hash(int argc, const char **argv,
> &worker[i].futex[nfutexes-1], t);
> }
>
> - free(worker[i].futex);
> + numa_free(worker[i].futex, nfutexes * sizeof(*worker[i].futex));
> }
>
> print_summary();
>
> - free(worker);
> + numa_free(worker, nthreads * sizeof(*worker));
> return ret;
> errmem:
> err(EXIT_FAILURE, "calloc");
> --
> 2.9.3
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