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-rw-r--r--src/libsystemd/test-bus-kernel-benchmark.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/src/libsystemd/test-bus-kernel-benchmark.c b/src/libsystemd/test-bus-kernel-benchmark.c
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+++ b/src/libsystemd/test-bus-kernel-benchmark.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <ctype.h>
+#include <sys/wait.h>
+
+#include "util.h"
+#include "log.h"
+#include "time-util.h"
+
+#include "sd-bus.h"
+#include "bus-message.h"
+#include "bus-error.h"
+#include "bus-kernel.h"
+#include "bus-internal.h"
+#include "bus-util.h"
+
+#define MAX_SIZE (4*1024*1024)
+
+static usec_t arg_loop_usec = 100 * USEC_PER_MSEC;
+
+static void server(sd_bus *b, size_t *result) {
+ int r;
+
+ for (;;) {
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+
+ r = sd_bus_process(b, &m);
+ assert_se(r >= 0);
+
+ if (r == 0)
+ assert_se(sd_bus_wait(b, (usec_t) -1) >= 0);
+ if (!m)
+ continue;
+
+ if (sd_bus_message_is_method_call(m, "benchmark.server", "Ping"))
+ assert_se(sd_bus_reply_method_return(m, NULL) >= 0);
+ else if (sd_bus_message_is_method_call(m, "benchmark.server", "Work")) {
+ const void *p;
+ size_t sz;
+
+ /* Make sure the mmap is mapped */
+ assert_se(sd_bus_message_read_array(m, 'y', &p, &sz) > 0);
+
+ assert_se(sd_bus_reply_method_return(m, NULL) >= 0);
+ } else if (sd_bus_message_is_method_call(m, "benchmark.server", "Exit")) {
+ uint64_t res;
+ assert_se(sd_bus_message_read(m, "t", &res) > 0);
+
+ *result = res;
+ return;
+
+ } else
+ assert_not_reached("Unknown method");
+ }
+}
+
+static void transaction(sd_bus *b, size_t sz) {
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
+ uint8_t *p;
+
+ assert_se(sd_bus_message_new_method_call(b, ":1.1", "/", "benchmark.server", "Work", &m) >= 0);
+ assert_se(sd_bus_message_append_array_space(m, 'y', sz, (void**) &p) >= 0);
+
+ memset(p, 0x80, sz);
+
+ assert_se(sd_bus_call(b, m, 0, NULL, &reply) >= 0);
+}
+
+static void client_bisect(const char *address) {
+ _cleanup_bus_message_unref_ sd_bus_message *x = NULL;
+ size_t lsize, rsize, csize;
+ sd_bus *b;
+ int r;
+
+ r = sd_bus_new(&b);
+ assert_se(r >= 0);
+
+ r = sd_bus_set_address(b, address);
+ assert_se(r >= 0);
+
+ r = sd_bus_start(b);
+ assert_se(r >= 0);
+
+ assert_se(sd_bus_call_method(b, ":1.1", "/", "benchmark.server", "Ping", NULL, NULL, NULL) >= 0);
+
+ lsize = 1;
+ rsize = MAX_SIZE;
+
+ printf("SIZE\tCOPY\tMEMFD\n");
+
+ for (;;) {
+ usec_t t;
+ unsigned n_copying, n_memfd;
+
+ csize = (lsize + rsize) / 2;
+
+ if (csize <= lsize)
+ break;
+
+ if (csize <= 0)
+ break;
+
+ printf("%zu\t", csize);
+
+ b->use_memfd = 0;
+
+ t = now(CLOCK_MONOTONIC);
+ for (n_copying = 0;; n_copying++) {
+ transaction(b, csize);
+ if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
+ break;
+ }
+ printf("%u\t", (unsigned) ((n_copying * USEC_PER_SEC) / arg_loop_usec));
+
+ b->use_memfd = -1;
+
+ t = now(CLOCK_MONOTONIC);
+ for (n_memfd = 0;; n_memfd++) {
+ transaction(b, csize);
+ if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
+ break;
+ }
+ printf("%u\n", (unsigned) ((n_memfd * USEC_PER_SEC) / arg_loop_usec));
+
+ if (n_copying == n_memfd)
+ break;
+
+ if (n_copying > n_memfd)
+ lsize = csize;
+ else
+ rsize = csize;
+ }
+
+ b->use_memfd = 1;
+ assert_se(sd_bus_message_new_method_call(b, ":1.1", "/", "benchmark.server", "Exit", &x) >= 0);
+ assert_se(sd_bus_message_append(x, "t", csize) >= 0);
+ assert_se(sd_bus_send(b, x, NULL) >= 0);
+
+ sd_bus_unref(b);
+}
+
+static void client_chart(const char *address) {
+ _cleanup_bus_message_unref_ sd_bus_message *x = NULL;
+ size_t csize;
+ sd_bus *b;
+ int r;
+
+ r = sd_bus_new(&b);
+ assert_se(r >= 0);
+
+ r = sd_bus_set_address(b, address);
+ assert_se(r >= 0);
+
+ r = sd_bus_start(b);
+ assert_se(r >= 0);
+
+ assert_se(sd_bus_call_method(b, ":1.1", "/", "benchmark.server", "Ping", NULL, NULL, NULL) >= 0);
+
+ printf("SIZE\tCOPY\tMEMFD\n");
+
+ for (csize = 1; csize <= MAX_SIZE; csize *= 2) {
+ usec_t t;
+ unsigned n_copying, n_memfd;
+
+ printf("%zu\t", csize);
+
+ b->use_memfd = 0;
+
+ t = now(CLOCK_MONOTONIC);
+ for (n_copying = 0;; n_copying++) {
+ transaction(b, csize);
+ if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
+ break;
+ }
+
+ printf("%u\t", (unsigned) ((n_copying * USEC_PER_SEC) / arg_loop_usec));
+
+ b->use_memfd = -1;
+
+ t = now(CLOCK_MONOTONIC);
+ for (n_memfd = 0;; n_memfd++) {
+ transaction(b, csize);
+ if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
+ break;
+ }
+
+ printf("%u\n", (unsigned) ((n_memfd * USEC_PER_SEC) / arg_loop_usec));
+ }
+
+ b->use_memfd = 1;
+ assert_se(sd_bus_message_new_method_call(b, ":1.1", "/", "benchmark.server", "Exit", &x) >= 0);
+ assert_se(sd_bus_message_append(x, "t", csize) >= 0);
+ assert_se(sd_bus_send(b, x, NULL) >= 0);
+
+ sd_bus_unref(b);
+}
+
+int main(int argc, char *argv[]) {
+ enum {
+ MODE_BISECT,
+ MODE_CHART,
+ } mode = MODE_BISECT;
+ int i;
+ _cleanup_free_ char *name = NULL, *bus_name = NULL, *address = NULL;
+ _cleanup_close_ int bus_ref = -1;
+ cpu_set_t cpuset;
+ size_t result;
+ sd_bus *b;
+ pid_t pid;
+ int r;
+
+ for (i = 1; i < argc; i++) {
+ if (streq(argv[i], "chart")) {
+ mode = MODE_CHART;
+ continue;
+ }
+
+ assert_se(parse_sec(argv[i], &arg_loop_usec) >= 0);
+ }
+
+ assert_se(arg_loop_usec > 0);
+
+ assert_se(asprintf(&name, "deine-mutter-%u", (unsigned) getpid()) >= 0);
+
+ bus_ref = bus_kernel_create_bus(name, false, &bus_name);
+ if (bus_ref == -ENOENT)
+ exit(EXIT_TEST_SKIP);
+
+ assert_se(bus_ref >= 0);
+
+ address = strappend("kernel:path=", bus_name);
+ assert_se(address);
+
+ r = sd_bus_new(&b);
+ assert_se(r >= 0);
+
+ r = sd_bus_set_address(b, address);
+ assert_se(r >= 0);
+
+ r = sd_bus_start(b);
+ assert_se(r >= 0);
+
+ sync();
+ setpriority(PRIO_PROCESS, 0, -19);
+
+ pid = fork();
+ assert_se(pid >= 0);
+
+ if (pid == 0) {
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+ pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
+
+ close_nointr_nofail(bus_ref);
+ sd_bus_unref(b);
+
+ switch (mode) {
+ case MODE_BISECT:
+ client_bisect(address);
+ break;
+
+ case MODE_CHART:
+ client_chart(address);
+ break;
+ }
+
+ _exit(0);
+ }
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(1, &cpuset);
+ pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
+
+ server(b, &result);
+
+ if (mode == MODE_BISECT)
+ printf("Copying/memfd are equally fast at %zu bytes\n", result);
+
+ assert_se(waitpid(pid, NULL, 0) == pid);
+
+ sd_bus_unref(b);
+
+ return 0;
+}
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