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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/lib/transport/bdp_estimator.h"
#include <stdlib.h>
#include <grpc/support/log.h>
#include <grpc/support/useful.h>
grpc_tracer_flag grpc_bdp_estimator_trace = GRPC_TRACER_INITIALIZER(false);
void grpc_bdp_estimator_init(grpc_bdp_estimator *estimator, const char *name) {
estimator->estimate = 65536;
estimator->ping_state = GRPC_BDP_PING_UNSCHEDULED;
estimator->name = name;
estimator->bw_est = 0;
}
bool grpc_bdp_estimator_get_estimate(grpc_bdp_estimator *estimator,
int64_t *estimate) {
*estimate = estimator->estimate;
return true;
}
bool grpc_bdp_estimator_get_bw(grpc_bdp_estimator *estimator, double *bw) {
*bw = estimator->bw_est;
return true;
}
bool grpc_bdp_estimator_add_incoming_bytes(grpc_bdp_estimator *estimator,
int64_t num_bytes) {
estimator->accumulator += num_bytes;
switch (estimator->ping_state) {
case GRPC_BDP_PING_UNSCHEDULED:
return true;
case GRPC_BDP_PING_SCHEDULED:
return false;
case GRPC_BDP_PING_STARTED:
return false;
}
GPR_UNREACHABLE_CODE(return false);
}
void grpc_bdp_estimator_schedule_ping(grpc_bdp_estimator *estimator) {
if (GRPC_TRACER_ON(grpc_bdp_estimator_trace)) {
gpr_log(GPR_DEBUG, "bdp[%s]:sched acc=%" PRId64 " est=%" PRId64,
estimator->name, estimator->accumulator, estimator->estimate);
}
GPR_ASSERT(estimator->ping_state == GRPC_BDP_PING_UNSCHEDULED);
estimator->ping_state = GRPC_BDP_PING_SCHEDULED;
estimator->accumulator = 0;
}
void grpc_bdp_estimator_start_ping(grpc_bdp_estimator *estimator) {
if (GRPC_TRACER_ON(grpc_bdp_estimator_trace)) {
gpr_log(GPR_DEBUG, "bdp[%s]:start acc=%" PRId64 " est=%" PRId64,
estimator->name, estimator->accumulator, estimator->estimate);
}
GPR_ASSERT(estimator->ping_state == GRPC_BDP_PING_SCHEDULED);
estimator->ping_state = GRPC_BDP_PING_STARTED;
estimator->accumulator = 0;
estimator->ping_start_time = gpr_now(GPR_CLOCK_MONOTONIC);
}
void grpc_bdp_estimator_complete_ping(grpc_bdp_estimator *estimator) {
gpr_timespec dt_ts =
gpr_time_sub(gpr_now(GPR_CLOCK_MONOTONIC), estimator->ping_start_time);
double dt = (double)dt_ts.tv_sec + 1e-9 * (double)dt_ts.tv_nsec;
double bw = dt > 0 ? ((double)estimator->accumulator / dt) : 0;
if (GRPC_TRACER_ON(grpc_bdp_estimator_trace)) {
gpr_log(GPR_DEBUG, "bdp[%s]:complete acc=%" PRId64 " est=%" PRId64
" dt=%lf bw=%lfMbs bw_est=%lfMbs",
estimator->name, estimator->accumulator, estimator->estimate, dt,
bw / 125000.0, estimator->bw_est / 125000.0);
}
GPR_ASSERT(estimator->ping_state == GRPC_BDP_PING_STARTED);
if (estimator->accumulator > 2 * estimator->estimate / 3 &&
bw > estimator->bw_est) {
estimator->estimate =
GPR_MAX(estimator->accumulator, estimator->estimate * 2);
estimator->bw_est = bw;
if (GRPC_TRACER_ON(grpc_bdp_estimator_trace)) {
gpr_log(GPR_DEBUG, "bdp[%s]: estimate increased to %" PRId64,
estimator->name, estimator->estimate);
}
}
estimator->ping_state = GRPC_BDP_PING_UNSCHEDULED;
estimator->accumulator = 0;
}
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