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/*
* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
* 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 the copyright holders 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.
*/
/*
* $Id$
*
* Description: The class to implement bandwidth and latency throttle. An
* instance of consumer class that can be woke up. It is only used
* to control bandwidth at output port of a switch. And the
* throttle is added *after* the output port, means the message is
* put in the output port of the PerfectSwitch (a
* intermediateBuffers) first, then go through the Throttle.
*
*/
#ifndef THROTTLE_H
#define THROTTLE_H
#include "mem/ruby/common/Global.hh"
#include "mem/gems_common/Vector.hh"
#include "mem/ruby/common/Consumer.hh"
#include "mem/ruby/system/NodeID.hh"
#include "mem/ruby/system/System.hh"
#include "mem/ruby/network/Network.hh"
class MessageBuffer;
class Throttle : public Consumer {
public:
// Constructors
Throttle(int sID, NodeID node, int link_latency, int link_bandwidth_multiplier);
Throttle(NodeID node, int link_latency, int link_bandwidth_multiplier);
// Destructor
~Throttle() {}
// Public Methods
void addLinks(const Vector<MessageBuffer*>& in_vec, const Vector<MessageBuffer*>& out_vec);
void wakeup();
bool broadcastBandwidthAvailable(int rand) const;
void printStats(ostream& out) const;
void clearStats();
void printConfig(ostream& out) const;
double getUtilization() const; // The average utilization (a percent) since last clearStats()
int getLinkBandwidth() const { return RubySystem::getNetwork()->getEndpointBandwidth() * m_link_bandwidth_multiplier; }
int getLatency() const { return m_link_latency; }
const Vector<Vector<int> >& getCounters() const { return m_message_counters; }
void clear();
void print(ostream& out) const;
private:
// Private Methods
void init(NodeID node, int link_latency, int link_bandwidth_multiplier);
void addVirtualNetwork(MessageBuffer* in_ptr, MessageBuffer* out_ptr);
void linkUtilized(double ratio) { m_links_utilized += ratio; }
// Private copy constructor and assignment operator
Throttle(const Throttle& obj);
Throttle& operator=(const Throttle& obj);
// Data Members (m_ prefix)
Vector<MessageBuffer*> m_in;
Vector<MessageBuffer*> m_out;
Vector<Vector<int> > m_message_counters;
int m_vnets;
Vector<int> m_units_remaining;
int m_sID;
NodeID m_node;
int m_bash_counter;
int m_bandwidth_since_sample;
Time m_last_bandwidth_sample;
int m_link_bandwidth_multiplier;
int m_link_latency;
int m_wakeups_wo_switch;
// For tracking utilization
Time m_ruby_start;
double m_links_utilized;
};
// Output operator declaration
ostream& operator<<(ostream& out, const Throttle& obj);
// ******************* Definitions *******************
// Output operator definition
extern inline
ostream& operator<<(ostream& out, const Throttle& obj)
{
obj.print(out);
out << flush;
return out;
}
#endif //THROTTLE_H
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