derek/DRAMSys
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

New error model finished (Testing still required)

Browse Source
This commit is contained in:
Matthias Jung
2015-08-01 15:53:48 +02:00
parent ea0e628eef
commit 33d88006c8
2 changed files with 175 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

205
DRAMSys/dramSys/src/error/errormodel.cpp
View File

@@ -36,6 +36,7 @@
#include "errormodel.h"
#include <random>
#include <chrono>
#include <bitset>
errorModel::errorModel(const char * name)
{
@@ -60,6 +61,39 @@ errorModel::errorModel(const char * name)
// Parse data input:
parseInputData();
prepareWeakCells();
// Test 1:
// If you want to test the function that get the number
// of bit errors for a given temperature and time
// uncomment the following lines:
//
//std::cout << "MAXTemp:" << maxTemperature << std::endl;
//std::cout << "MAXTime:" << maxTime << std::endl;
//getNumberOfFlips(45.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(45.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(45.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(75.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(75.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(75.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(85.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(85.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(85.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(88.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(88.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(88.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(89.0,sc_time(64.0,SC_MS));
//getNumberOfFlips(89.0,sc_time(64.0,SC_MS));
//getNumberOfFlips(89.0,sc_time(64.0,SC_MS));
// Test 2:
// X X X
// X 1 1
// X 1 1
//setTemperature(89);
//weakCells[0].bit = 0;
//weakCells[0].col = 0;
//weakCells[0].row = 0;
//weakCells[0].dependent = true;
}
errorModel::~errorModel()
@@ -193,6 +227,7 @@ void errorModel::activate(unsigned int row)
// Check if Bit has marked as flipped yet, if yes mark it as flipped
if(weakCells[i].flipped == false)
{
//std::cout << "Maked weakCell[" << i << "] as flipped" << std::endl;
weakCells[i].flipped = true;
}
}
@@ -238,12 +273,76 @@ void errorModel::activate(unsigned int row)
// Flip the bit:
tempByte = (tempByte & mask);
std::cout << "--- Bit Flipped:"
<< " row: " << key.row
<< " col: " << key.column
<< " bit: " << weakCells[i].bit
<< " ---"<< std::endl;
numberOfBitErrorEvents++;
// Copy the modified byte back to the dataMap:
memcpy(dataMap[key]+byte, &tempByte, 1);
}
else // if(weakCells[i].dependent == true)
{
// TODO: dependet
// Get the neighbourhood of the bit and store it in the
// grid variable:
// | 0 1 2 |
// grid = | 3 4 5 |
// | 6 7 8 |
unsigned int grid[9];
grid[0] = getBit(key.row-1,key.column,byte,bitInByte-1);
grid[1] = getBit(key.row-1,key.column,byte,bitInByte );
grid[2] = getBit(key.row-1,key.column,byte,bitInByte+1);
grid[3] = getBit(key.row ,key.column,byte,bitInByte-1);
grid[4] = getBit(key.row ,key.column,byte,bitInByte );
grid[5] = getBit(key.row ,key.column,byte,bitInByte+1);
grid[6] = getBit(key.row+1,key.column,byte,bitInByte-1);
grid[7] = getBit(key.row+1,key.column,byte,bitInByte );
grid[8] = getBit(key.row+1,key.column,byte,bitInByte+1);
unsigned int sum = 0;
for(int s = 0; s < 9; s++)
{
sum += grid[s];
}
if(sum <= 4)
{
// Load the affected byte to tempByte
memcpy(&tempByte, dataMap[key]+byte, 1);
// Flip the bit:
tempByte = (tempByte & mask);
numberOfBitErrorEvents++;
// Copy the modified byte back to the dataMap:
memcpy(dataMap[key]+byte, &tempByte, 1);
std::cout << "--- Dependent Bit Flipped:"
<< " row: " << key.row
<< " col: " << key.column
<< " bit: " << weakCells[i].bit
<< " sum: " << sum
<< " ---"<< std::endl;
std::cout << grid[0] << grid[1] << grid[2] << std::endl;
std::cout << grid[3] << grid[4] << grid[5] << std::endl;
std::cout << grid[6] << grid[7] << grid[8] << std::endl;
}
else
{
std::cout << "--- Dependent Bit NOT Flipped:"
<< " row: " << key.row
<< " col: " << key.column
<< " bit: " << weakCells[i].bit
<< " sum: " << sum
<< " ---"<< std::endl;
}
}
}
}
@@ -252,10 +351,9 @@ void errorModel::activate(unsigned int row)
lastRowAccess[row] = sc_time_stamp();
}
unsigned int errorModel::getBit(DecodedAddress key, unsigned int byte, unsigned int bitInByte)
// This method is used to get a bit with a key, usually for independent case:
unsigned int errorModel::getBit(DecodedAddress key, unsigned int byteInColumn, unsigned int bitInByte)
{
// TODO: corner cases
// If the data was not writte by the produce yet it is zero:
if(dataMap.count(key) == 0)
{
@@ -266,12 +364,78 @@ unsigned int errorModel::getBit(DecodedAddress key, unsigned int byte, unsigned
unsigned char tempByte;
// Copy affected byte to a temporal variable:
memcpy(&tempByte, dataMap[key]+byte, 1);
memcpy(&tempByte, dataMap[key]+byteInColumn, 1);
unsigned char mask = pow(2, bitInByte);
return (byte & mask) >> bitInByte;
unsigned int result = (tempByte & mask) >> bitInByte;
std::bitset<8> x(mask);
std::cout << "mask = " << x
<< " bitInByte = " << bitInByte
<< " tempByte = " << (unsigned int)tempByte
<< " result = " << result << std::endl;
return result;
}
}
// This method is used to get neighbourhoods, for the dependent case:
unsigned int errorModel::getBit(int row, int column, int byteInColumn, int bitInByte)
{
// Border-Exception handling:
// Switch the byte if bit under/overflow:
if(bitInByte < 0)
{
byteInColumn--;
bitInByte = 7;
}
else if(bitInByte >= 8)
{
byteInColumn++;
bitInByte = 0;
}
// Switch the column if byte under/overflow
if(byteInColumn < 0)
{
column--;
byteInColumn = bytesPerColumn;
}
else if(byteInColumn >= int(byteInColumn))
{
column++;
byteInColumn = 0;
}
// If we switch the row we return 0 (culumn under/overflow)
if(column < 0)
{
return 0;
}
else if(column >= int(numberOfColumns))
{
return 0;
}
// Row over/underflow return 0
if(row < 0)
{
return 0;
}
else if(row >= int(numberOfRows))
{
return 0;
}
DecodedAddress key;
key.bank = myBank;
key.bankgroup = myBankgroup;
key.channel = myChannel;
key.rank = myRank;
key.column = column;
key.row = row;
getBit(key, byteInColumn, bitInByte);
}
void errorModel::setTemperature(double t)
{
temperature = t;
@@ -455,30 +619,6 @@ void errorModel::prepareWeakCells()
<< "\tflip=" << weakCells[i].flipped
<< "\tdep=" << weakCells[i].dependent << std::endl;
}
// Test:
// If you want to test the function that get the number
// of bit errors for a given temperature and time
// uncomment the following lines:
//
//std::cout << "MAXTemp:" << maxTemperature << std::endl;
//std::cout << "MAXTime:" << maxTime << std::endl;
//getNumberOfFlips(45.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(45.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(45.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(75.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(75.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(75.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(85.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(85.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(85.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(88.0,sc_time(200.0,SC_MS));
//getNumberOfFlips(88.0,sc_time(190.0,SC_MS));
//getNumberOfFlips(88.0,sc_time(180.0,SC_MS));
//getNumberOfFlips(89.0,sc_time(64.0,SC_MS));
//getNumberOfFlips(89.0,sc_time(64.0,SC_MS));
//getNumberOfFlips(89.0,sc_time(64.0,SC_MS));
}
// Retrieve number of flipping bits which fits best to temperature input and time since last refresh
@@ -521,13 +661,14 @@ unsigned int errorModel::getNumberOfFlips(double temp, sc_time time)
errors e = errorMap[nearestTemperature][nearestTime];
// Find nearest time:
std::cout << "XXX temp:" << temp
/*
std::cout << "ACT/REF temp:" << temp
<< " time:" << time
<< " nearestTemp:" << nearestTemperature
<< " nearestTime:" << nearestTime
<< " ind:" << e.independent
<< " dep:" << e.dependent << std::endl;
*/
return e.independent + e.dependent;
}
}

2
DRAMSys/dramSys/src/error/errormodel.h
View File

@@ -66,6 +66,7 @@ class errorModel
// Online Parameters:
double temperature;
unsigned int numberOfBitErrorEvents;
// Private Methods:
void parseInputData();
@@ -73,6 +74,7 @@ class errorModel
unsigned int getNumberOfFlips(double temp, sc_time time);
void setContext(DecodedAddress addr);
unsigned int getBit(DecodedAddress key, unsigned int byte, unsigned int bitInByte);
unsigned int getBit(int row, int column, int byteInColumn, int bitInByte);
// Input related data structures: