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foundationdb/flow/Knobs.cpp

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/*
* Knobs.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* 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.
*/
#include "Knobs.h"
#include "flow/flow.h"
FlowKnobs const* FLOW_KNOBS = new FlowKnobs();
#define init( knob, value ) initKnob( knob, value, #knob )
FlowKnobs::FlowKnobs(bool randomize, bool isSimulated) {
init( AUTOMATIC_TRACE_DUMP, 1 );
init( PREVENT_FAST_SPIN_DELAY, .01 );
init( CACHE_REFRESH_INTERVAL_WHEN_ALL_ALTERNATIVES_FAILED, 1.0 );
init( DELAY_JITTER_OFFSET, 0.9 );
init( DELAY_JITTER_RANGE, 0.2 );
init( BUSY_WAIT_THRESHOLD, 0 ); // 1e100 == never sleep
init( CLIENT_REQUEST_INTERVAL, 0.1 ); if( randomize && BUGGIFY ) CLIENT_REQUEST_INTERVAL = 1.0;
init( REACTOR_FLAGS, 0 );
init( DISABLE_ASSERTS, 0 );
init( QUEUE_MODEL_SMOOTHING_AMOUNT, 2.0 );
init( SLOWTASK_PROFILING_INTERVAL, 0.125 ); // A value of 0 disables SlowTask profiling
init( SLOWTASK_PROFILING_MAX_LOG_INTERVAL, 1.0 );
init( SLOWTASK_PROFILING_LOG_BACKOFF, 2.0 );
init( RANDOMSEED_RETRY_LIMIT, 4 );
//connectionMonitor
init( CONNECTION_MONITOR_LOOP_TIME, isSimulated ? 0.75 : 1.0 ); if( randomize && BUGGIFY ) CONNECTION_MONITOR_LOOP_TIME = 6.0;
init( CONNECTION_MONITOR_TIMEOUT, isSimulated ? 1.50 : 2.0 ); if( randomize && BUGGIFY ) CONNECTION_MONITOR_TIMEOUT = 6.0;
//FlowTransport
init( CONNECTION_REJECTED_MESSAGE_DELAY, 1.0 );
init( CONNECTION_ID_TIMEOUT, 600.0 );
init( CONNECTION_CLEANUP_DELAY, 100.0 );
init( INITIAL_RECONNECTION_TIME, 0.05 );
init( MAX_RECONNECTION_TIME, 0.5 );
init( RECONNECTION_TIME_GROWTH_RATE, 1.2 );
init( RECONNECTION_RESET_TIME, 5.0 );
//AsyncFileCached
init( PAGE_CACHE_4K, 2000LL<<20 );
init( PAGE_CACHE_64K, 200LL<<20 );
init( SIM_PAGE_CACHE_4K, 1e8 );
init( SIM_PAGE_CACHE_64K, 1e7 );
init( BUGGIFY_SIM_PAGE_CACHE_4K, 1e6 );
init( BUGGIFY_SIM_PAGE_CACHE_64K, 1e6 );
init( MAX_EVICT_ATTEMPTS, 100 ); if( randomize && BUGGIFY ) MAX_EVICT_ATTEMPTS = 2;
//AsyncFileKAIO
init( MAX_OUTSTANDING, 64 );
init( MIN_SUBMIT, 10 );
init( PAGE_WRITE_CHECKSUM_HISTORY, 0 ); if( randomize && BUGGIFY ) PAGE_WRITE_CHECKSUM_HISTORY = 10000000;
//AsyncFileNonDurable
init( MAX_PRIOR_MODIFICATION_DELAY, 1.0 ); if( randomize && BUGGIFY ) MAX_PRIOR_MODIFICATION_DELAY = 10.0;
//GenericActors
init( MAX_DELIVER_DUPLICATE_DELAY, 1.0 ); if( randomize && BUGGIFY ) MAX_DELIVER_DUPLICATE_DELAY = 10.0;
init( BUGGIFY_FLOW_LOCK_RELEASE_DELAY, 1.0 );
//IAsyncFile
init( INCREMENTAL_DELETE_TRUNCATE_AMOUNT, 5e8 ); //500MB
init( INCREMENTAL_DELETE_INTERVAL, 1.0 ); //every 1 second
//Net2 and FlowTransport
init( MIN_COALESCE_DELAY, 10e-6 ); if( randomize && BUGGIFY ) MIN_COALESCE_DELAY = 0;
init( MAX_COALESCE_DELAY, 20e-6 ); if( randomize && BUGGIFY ) MAX_COALESCE_DELAY = 0;
init( SLOW_LOOP_CUTOFF, 15.0 / 1000.0 );
init( SLOW_LOOP_SAMPLING_RATE, 0.1 );
init( TSC_YIELD_TIME, 1000000 );
//Network
init( PACKET_LIMIT, 100LL<<20 );
init( PACKET_WARNING, 2LL<<20 ); // 2MB packet warning quietly allows for 1MB system messages
init( TIME_OFFSET_LOGGING_INTERVAL, 60.0 );
//Sim2
init( MIN_OPEN_TIME, 0.0002 );
init( MAX_OPEN_TIME, 0.0012 );
init( SIM_DISK_IOPS, 5000 );
init( SIM_DISK_BANDWIDTH, 50000000 );
init( MIN_NETWORK_LATENCY, 100e-6 );
init( FAST_NETWORK_LATENCY, 800e-6 );
init( SLOW_NETWORK_LATENCY, 100e-3 );
init( MAX_CLOGGING_LATENCY, 0 ); if( randomize && BUGGIFY ) MAX_CLOGGING_LATENCY = 0.1 * g_random->random01();
init( MAX_BUGGIFIED_DELAY, 0 ); if( randomize && BUGGIFY ) MAX_BUGGIFIED_DELAY = 0.2 * g_random->random01();
//Tracefiles
init( ZERO_LENGTH_FILE_PAD, 1 );
init( TRACE_FLUSH_INTERVAL, 0.25 );
init( TRACE_RETRY_OPEN_INTERVAL, 1.00 );
init( MIN_TRACE_SEVERITY, isSimulated ? 0 : 10 ); // Related to the trace severity in Trace.h
init( MAX_TRACE_SUPPRESSIONS, 1e4 );
init( TRACE_FSYNC_ENABLED, 0 );
//TDMetrics
init( MAX_METRICS, 600 );
init( MAX_METRIC_SIZE, 2500 );
init( MAX_METRIC_LEVEL, 25 );
init( METRIC_LEVEL_DIVISOR, log(4) );
init( METRIC_LIMIT_START_QUEUE_SIZE, 10 ); // The queue size at which to start restricting logging by disabling levels
init( METRIC_LIMIT_RESPONSE_FACTOR, 10 ); // The additional queue size at which to disable logging of another level (higher == less restrictive)
//Load Balancing
init( LOAD_BALANCE_MAX_BACKOFF, 5.0 );
init( LOAD_BALANCE_START_BACKOFF, 0.01 );
init( LOAD_BALANCE_BACKOFF_RATE, 2.0 );
init( MAX_LAGGING_REQUESTS_OUTSTANDING, 100000 );
init( INSTANT_SECOND_REQUEST_MULTIPLIER, 2.0 );
init( BASE_SECOND_REQUEST_TIME, 0.0005 );
init( SECOND_REQUEST_MULTIPLIER_GROWTH, 0.01 );
init( SECOND_REQUEST_MULTIPLIER_DECAY, 0.00025 );
init( SECOND_REQUEST_BUDGET_GROWTH, 0.05 );
init( SECOND_REQUEST_MAX_BUDGET, 100.0 );
init( ALTERNATIVES_FAILURE_RESET_TIME, 5.0 );
init( ALTERNATIVES_FAILURE_MAX_DELAY, 1.0 );
init( ALTERNATIVES_FAILURE_MIN_DELAY, 0.05 );
init( ALTERNATIVES_FAILURE_DELAY_RATIO, 0.2 );
}
bool Knobs::setKnob( std::string const& knob, std::string const& value ) {
if (double_knobs.count(knob)) {
double v;
int n=0;
if (sscanf(value.c_str(), "%lf%n", &v, &n) != 1 || n != value.size())
throw invalid_option_value();
*double_knobs[knob] = v;
return true;
}
if (int64_knobs.count(knob) || int_knobs.count(knob)) {
int64_t v;
int n=0;
if (StringRef(value).startsWith(LiteralStringRef("0x"))) {
if (sscanf(value.c_str(), "0x%llx%n", &v, &n) != 1 || n != value.size())
throw invalid_option_value();
} else {
if (sscanf(value.c_str(), "%lld%n", &v, &n) != 1 || n != value.size())
throw invalid_option_value();
}
if (int64_knobs.count(knob))
*int64_knobs[knob] = v;
else {
if ( v < std::numeric_limits<int>::min() || v > std::numeric_limits<int>::max() )
throw invalid_option_value();
*int_knobs[knob] = v;
}
return true;
}
return false;
}
static std::string toLower( std::string const& name ) {
std::string lower_name;
for(auto c = name.begin(); c != name.end(); ++c)
if (*c >= 'A' && *c <= 'Z')
lower_name += *c - 'A' + 'a';
else
lower_name += *c;
return lower_name;
}
void Knobs::initKnob( double& knob, double value, std::string const& name ) {
knob = value;
double_knobs[toLower(name)] = &knob;
}
void Knobs::initKnob( int64_t& knob, int64_t value, std::string const& name ) {
knob = value;
int64_knobs[toLower(name)] = &knob;
}
void Knobs::initKnob( int& knob, int value, std::string const& name ) {
knob = value;
int_knobs[toLower(name)] = &knob;
}
void Knobs::trace() {
for(auto &k : double_knobs)
TraceEvent("Knob").detail(k.first.c_str(), *k.second );
for(auto &k : int_knobs)
TraceEvent("Knob").detail(k.first.c_str(), *k.second );
for(auto &k : int64_knobs)
TraceEvent("Knob").detail(k.first.c_str(), *k.second );
}
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