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Use moving average to calculate tunnel creation success rate

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This commit is contained in:
Tomas Globis 2023-01-03 03:07:07 +03:00
parent d5b03f214b
commit 66f82cb43f
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GPG Key ID: E86E34EAA5DB652F
2 changed files with 22 additions and 13 deletions
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9
libi2pd/Tunnel.cpp
View File

@ -332,8 +332,7 @@ namespace tunnel
Tunnels tunnels;
Tunnels::Tunnels (): m_IsRunning (false), m_Thread (nullptr),
m_NumSuccesiveTunnelCreations (0), m_NumFailedTunnelCreations (0)
{
m_TunnelCreationSuccessRate (TCSR_START_VALUE), m_TunnelCreationAttemptsNum(0) {
}
Tunnels::~Tunnels ()
@ -630,7 +629,7 @@ namespace tunnel
}
// delete
it = pendingTunnels.erase (it);
m_NumFailedTunnelCreations++;
FailedTunnelCreation();
}
else
++it;
@ -638,7 +637,7 @@ namespace tunnel
case eTunnelStateBuildFailed:
LogPrint (eLogDebug, "Tunnel: Pending build request ", it->first, " failed, deleted");
it = pendingTunnels.erase (it);
m_NumFailedTunnelCreations++;
FailedTunnelCreation();
break;
case eTunnelStateBuildReplyReceived:
// intermediate state, will be either established of build failed
@ -647,7 +646,7 @@ namespace tunnel
default:
// success
it = pendingTunnels.erase (it);
m_NumSuccesiveTunnelCreations++;
SuccesiveTunnelCreation();
}
}
}

26
libi2pd/Tunnel.h
View File

@ -44,10 +44,13 @@ namespace tunnel
const int TUNNEL_MANAGE_INTERVAL = 15; // in seconds
const int TUNNEL_POOLS_MANAGE_INTERVAL = 5; // in seconds
const int TUNNEL_MEMORY_POOL_MANAGE_INTERVAL = 120; // in seconds
const size_t I2NP_TUNNEL_MESSAGE_SIZE = TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + 34; // reserved for alignment and NTCP 16 + 6 + 12
const size_t I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE = 2*TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE + 28; // reserved for alignment and NTCP 16 + 6 + 6
const double TCSR_SMOOTHING_CONSTANT = 0.0005; // smoothing constant in exponentially weighted moving average
const double TCSR_START_VALUE = 0.1; // start value of tunnel creation success rate
enum TunnelState
{
eTunnelStatePending,
@ -267,8 +270,19 @@ namespace tunnel
i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE> > m_I2NPTunnelEndpointMessagesMemoryPool;
i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_MESSAGE_SIZE> > m_I2NPTunnelMessagesMemoryPool;
// some stats
int m_NumSuccesiveTunnelCreations, m_NumFailedTunnelCreations;
// Calculating of tunnel creation success rate
// A modified version of the EWMA algorithm, where alpha is increased at the beginning to accelerate similarity
void SuccesiveTunnelCreation() {
double alpha = TCSR_SMOOTHING_CONSTANT + (1 - TCSR_SMOOTHING_CONSTANT)/++m_TunnelCreationAttemptsNum;
m_TunnelCreationSuccessRate = alpha * 1 + (1 - alpha) * m_TunnelCreationSuccessRate;
};
void FailedTunnelCreation() {
double alpha = TCSR_SMOOTHING_CONSTANT + (1 - TCSR_SMOOTHING_CONSTANT)/++m_TunnelCreationAttemptsNum;
m_TunnelCreationSuccessRate = alpha * 0 + (1 - alpha) * m_TunnelCreationSuccessRate;
};
double m_TunnelCreationSuccessRate;
int m_TunnelCreationAttemptsNum;
public:
@ -282,11 +296,7 @@ namespace tunnel
size_t CountOutboundTunnels() const;
int GetQueueSize () { return m_Queue.GetSize (); };
int GetTunnelCreationSuccessRate () const // in percents
{
int totalNum = m_NumSuccesiveTunnelCreations + m_NumFailedTunnelCreations;
return totalNum ? m_NumSuccesiveTunnelCreations*100/totalNum : 0;
}
int GetTunnelCreationSuccessRate () const { return std::round(m_TunnelCreationSuccessRate * 100); } // in percents
};
extern Tunnels tunnels;