bc00666271
Currently, each histogram range is hardcoded to 128 buckets (1ULL << 7), resulting in 58 ranges (64 - 7 + 1) and a total size of 58 * 128 * sizeof(uint64_t) = 59392 bytes. To allow for more usage models in cases where this size is prohibitive, enable the following changes: 1) specify number of buckets per range (in number of bits) 2) specify max datapoint value (in number of bits) The latter can be useful for cases where datapoints are never close to requiring all 64 bits - and allows reducing the number of ranges. Any data points that exceed the max will be tallied in the last bucket in the last range. Testing shows no performance disadvantage using the dynamic approach. Signed-off-by: Jim Harris <james.r.harris@intel.com> Change-Id: I5979bcdff6209faaa9dee293918ef2a78679bcd4 Reviewed-on: https://review.gerrithub.io/392707 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com>
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "spdk/stdinc.h"
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#include "spdk/env.h"
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#include "spdk/util.h"
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#include "spdk/histogram_data.h"
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/*
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* This applications is a simple test app used to test the performance of
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* tallying datapoints with struct spdk_histogram_data. It can be used
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* to measure the effect of changes to the spdk_histogram_data implementation.
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*
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* There are no command line parameters currently - it just tallies
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* datapoints for 10 seconds in a default-sized histogram structure and
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* then prints out the number of tallies performed.
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*/
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static void
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usage(const char *prog)
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{
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printf("usage: %s\n", prog);
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printf("Options:\n");
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}
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int
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main(int argc, char **argv)
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{
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struct spdk_histogram_data *h;
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struct spdk_env_opts opts;
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uint64_t tsc[128], t, end_tsc, count;
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uint32_t i;
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int ch;
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int rc = 0;
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while ((ch = getopt(argc, argv, "")) != -1) {
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switch (ch) {
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default:
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usage(argv[0]);
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return 1;
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}
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}
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spdk_env_opts_init(&opts);
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spdk_env_init(&opts);
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for (i = 0; i < SPDK_COUNTOF(tsc); i++) {
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tsc[i] = spdk_get_ticks();
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}
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end_tsc = spdk_get_ticks() + (10 * spdk_get_ticks_hz());
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count = 0;
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h = spdk_histogram_data_alloc();
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while (true) {
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t = spdk_get_ticks();
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spdk_histogram_data_tally(h, t - tsc[count % 128]);
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count++;
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if (t > end_tsc) {
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break;
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}
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}
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printf("count = %ju\n", count);
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spdk_histogram_data_free(h);
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return rc;
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}
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