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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2016 Couchbase, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* High dynamic range timings, using HdrHistogram
* (http://hdrhistogram.github.io/HdrHistogram/), specifically the
* C implementation (https://github.com/HdrHistogram/HdrHistogram_c)
*
* hdr_timings.c is a rrop-in replacment for timings.c - you only want one of
* the two files.
*/
#include "internal.h"
#include "hdr_histogram.h"
struct lcb_histogram_st {
struct hdr_histogram* hdr_histogram;
};
LCB_INTERNAL_API
lcb_HISTOGRAM *
lcb_histogram_create(void)
{
lcb_HISTOGRAM* histo = calloc(1, sizeof(struct lcb_histogram_st));
if (histo != NULL) {
hdr_init(/* minimum - 1 ns*/ 1,
/* maximum - 30 s*/ 30e9,
/* s ignificant figures */3,
&histo->hdr_histogram);
}
return histo;
}
LCB_INTERNAL_API
void
lcb_histogram_destroy(lcb_HISTOGRAM *hg)
{
free(hg->hdr_histogram);
free(hg);
}
LCB_INTERNAL_API
void
lcb_histogram_read(const lcb_HISTOGRAM *hg,
const void *cookie, lcb_HISTOGRAM_CALLBACK callback)
{
struct hdr_iter iter;
hdr_iter_recorded_init(&iter, hg->hdr_histogram);
while (hdr_iter_next(&iter)) {
callback(cookie, LCB_TIMEUNIT_NSEC,
iter.value_iterated_from, iter.value_iterated_to,
iter.count,
hdr_max(hg->hdr_histogram));
}
}
LCB_INTERNAL_API
lcb_error_t lcb_histogram_print(lcb_HISTOGRAM* hg, FILE* stream) {
hdr_percentiles_print(
hg->hdr_histogram,
stream,
5, // Granularity of printed values
1.0, // Multiplier for results
CLASSIC); // Format CLASSIC/CSV supported.
return LCB_SUCCESS;
}
LCB_INTERNAL_API
void
lcb_histogram_record(lcb_HISTOGRAM *hg, lcb_U64 delta)
{
hdr_record_value(hg->hdr_histogram, delta);
}