diff options
Diffstat (limited to 'src/libsystemd-bus/test-bus-kernel-benchmark.c')
| -rw-r--r-- | src/libsystemd-bus/test-bus-kernel-benchmark.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/libsystemd-bus/test-bus-kernel-benchmark.c b/src/libsystemd-bus/test-bus-kernel-benchmark.c new file mode 100644 index 0000000000..403af885c3 --- /dev/null +++ b/src/libsystemd-bus/test-bus-kernel-benchmark.c @@ -0,0 +1,225 @@ +/*-*- 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 "sd-bus.h" +#include "bus-message.h" +#include "bus-error.h" +#include "bus-kernel.h" +#include "bus-internal.h" + +#define N_TRIES 500 +#define MAX_SIZE (5*1024*1024) + +static void server(sd_bus *b, usec_t *result) { + usec_t x = 0; + 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; + + /* log_error("huhu %s from %s", sd_bus_message_get_member(m), sd_bus_message_get_sender(m)); */ + + if (sd_bus_message_is_method_call(m, "benchmark.server", "Work")) { + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + size_t i, sz; + char *q; + const char *p; + + assert_se(sd_bus_message_read_array(m, 'y', (const void**) &p, &sz) > 0); + assert_se(sd_bus_message_new_method_return(b, m, &reply) >= 0); + assert_se(sd_bus_message_append_array_space(reply, 'y', sz, (void**) &q) >= 0); + + x = now(CLOCK_MONOTONIC); + + for (i = 0; i < sz; i++) + q[i] = toupper(p[i]); + + x = now(CLOCK_MONOTONIC) - x; + + assert_se(sd_bus_send(b, reply, NULL) >= 0); + } else if (sd_bus_message_is_method_call(m, "benchmark.server", "Exit")) { + usec_t t; + + assert_se(sd_bus_message_read(m, "t", &t) > 0); + assert_se(t >= x); + *result = t - x; + return; + + } else if (sd_bus_message_is_method_call(m, "benchmark.server", "Ping")) { + assert_se(sd_bus_reply_method_return(b, m, "y", 1) >= 0); + } else + assert_not_reached("Unknown method"); + } +} + +static void client(sd_bus *b, size_t sz) { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL; + char *p; + const char *q; + usec_t t; + size_t l, i; + + assert_se(sd_bus_call_method(b, ":1.1", "/", "benchmark.server", "Ping", NULL, NULL, NULL) >= 0); + + 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); + + for (i = 0; i < sz; i++) + p[i] = 'a' + (char) (i % 26); + + t = now(CLOCK_MONOTONIC); + assert_se(sd_bus_send_with_reply_and_block(b, m, 0, NULL, &reply) >= 0); + t = now(CLOCK_MONOTONIC) - t; + + assert_se(sd_bus_message_read_array(reply, 'y', (const void**) &q, &l) > 0); + assert_se(l == sz); + + for (i = 0; i < sz; i++) { + assert_se(q[i] == 'A' + (char) (i % 26)); + } + + sd_bus_message_unref(m); + + assert_se(sd_bus_message_new_method_call(b, ":1.1", "/", "benchmark.server", "Exit", &m) >= 0); + assert_se(sd_bus_message_append(m, "t", t) >= 0); + assert_se(sd_bus_send(b, m, NULL) >= 0); +} + +static void run_benchmark(size_t sz, bool force_copy, usec_t *result) { + + _cleanup_close_ int bus_ref = -1; + _cleanup_free_ char *bus_name = NULL, *address = NULL; + sd_bus *b; + int r; + pid_t pid; + + bus_ref = bus_kernel_create("deine-mutter", &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); + + b->use_memfd = force_copy ? 0 : -1; + + r = sd_bus_set_address(b, address); + assert_se(r >= 0); + + r = sd_bus_start(b); + assert_se(r >= 0); + + pid = fork(); + assert_se(pid >= 0); + + if (pid == 0) { + close_nointr_nofail(bus_ref); + sd_bus_unref(b); + + r = sd_bus_new(&b); + assert_se(r >= 0); + + b->use_memfd = force_copy ? 0 : -1; + + r = sd_bus_set_address(b, address); + assert_se(r >= 0); + + r = sd_bus_start(b); + assert_se(r >= 0); + + client(b, sz); + _exit(0); + } + + server(b, result); + sd_bus_unref(b); + + assert_se(waitpid(pid, NULL, 0) == pid); +} + +int main(int argc, char *argv[]) { + size_t lsize, rsize, csize; + + log_set_max_level(LOG_DEBUG); + + lsize = 1; + rsize = MAX_SIZE; + + for (;;) { + usec_t copy = 0, memfd = 0; + unsigned i; + + csize = (lsize + rsize) / 2; + + log_info("Trying size=%zu", csize); + + if (csize <= lsize) + break; + + for (i = 0; i < N_TRIES; i++) { + usec_t t; + + run_benchmark(csize, true, &t); + copy += t; + } + + for (i = 0; i < N_TRIES; i++) { + usec_t t; + + run_benchmark(csize, false, &t); + memfd += t; + } + + copy /= N_TRIES; + memfd /= N_TRIES; + + if (copy == memfd) + break; + + if (copy < memfd) + lsize = csize; + else + rsize = csize; + } + + log_info("Copying/memfd are equally fast at %zu", csize); + + return 0; +} |