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bench: add lots-of-timers benchmark
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved. | ||
* | ||
* Permission is hereby granted, free of charge, to any person obtaining a copy | ||
* of this software and associated documentation files (the "Software"), to | ||
* deal in the Software without restriction, including without limitation the | ||
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
* sell copies of the Software, and to permit persons to whom the Software is | ||
* furnished to do so, subject to the following conditions: | ||
* | ||
* The above copyright notice and this permission notice shall be included in | ||
* all copies or substantial portions of the Software. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
* IN THE SOFTWARE. | ||
*/ | ||
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#include "task.h" | ||
#include "uv.h" | ||
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#define NUM_TIMERS (1000 * 1000) | ||
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static int timer_cb_called; | ||
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static void timer_cb(uv_timer_t* handle, int status) { | ||
timer_cb_called++; | ||
} | ||
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BENCHMARK_IMPL(million_timers) { | ||
uv_timer_t* timers; | ||
uv_loop_t* loop; | ||
uint64_t before; | ||
uint64_t after; | ||
int timeout; | ||
int i; | ||
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timers = malloc(NUM_TIMERS * sizeof(timers[0])); | ||
ASSERT(timers != NULL); | ||
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loop = uv_default_loop(); | ||
timeout = 0; | ||
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for (i = 0; i < NUM_TIMERS; i++) { | ||
if (i % 1000 == 0) timeout++; | ||
ASSERT(0 == uv_timer_init(loop, timers + i)); | ||
ASSERT(0 == uv_timer_start(timers + i, timer_cb, timeout, 0)); | ||
} | ||
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before = uv_hrtime(); | ||
ASSERT(0 == uv_run(loop)); | ||
after = uv_hrtime(); | ||
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ASSERT(timer_cb_called == NUM_TIMERS); | ||
free(timers); | ||
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LOGF("%.2f seconds\n", (after - before) / 1e9); | ||
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return 0; | ||
} |
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Interestingly, this benchmark scores better with debug builds. In debug mode, nearly all timers miss their deadline so the test ends up doing way less syscalls (2-3 instead of ~50 in release builds).