Repo management & code cleanup

Assignment7/.gitignore

@@ -0,0 +1,2 @@
+student_out\*.out
+a.out

Assignment7/.idea/runConfigurations/Test1.xml

@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Test1" type="CLionNativeAppRunConfigurationType" PROGRAM_PARAMS="3" REDIRECT_INPUT="true" REDIRECT_INPUT_PATH="$PROJECT_DIR$/in/algo-check.in" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Assignment7" TARGET_NAME="all" CONFIG_NAME="all" version="1" RUN_PATH="$PROJECT_DIR$/a.out">
+    <method v="2">
+      <option name="CLION.COMPOUND.BUILD" enabled="true" />
+    </method>
+  </configuration>
+</component>

Assignment7/code/main.c

@@ -1,72 +1,74 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
+
 #define OFFSETBITS 12
 #define PAGESIZE (1 << OFFSETBITS)
 #define PAGETABLEBITS 10
 #define ARCH 32
 int framesSize;
-unsigned int pageFault=0;
+unsigned int pageFault = 0;
 unsigned int pageHits = 0;
 unsigned int pagesSwapped = 0;
 int time = 0;
 
-
+typedef struct frameEntry {
-
-typedef struct frameEntry{
 	unsigned int pageNumber;
 	int lastUsed;
 	bool dirty;
 } frameEntry;
 
-frameEntry* frames;
+frameEntry *frames;
 
-int getPageOffsetAddress(unsigned long logicalAddress){
+int getPageOffsetAddress(unsigned long logicalAddress) {
 	// Last 12 bits of logical address
 	// Page size is 4096 bytes, and we bitwise AND with 4095 (111111111111) to get the last 12 bits
-	return logicalAddress & (PAGESIZE-1);
+	return logicalAddress & (PAGESIZE - 1);
 }
 
-int getPageNumber(unsigned long logicalAddress){
+int getPageNumber(unsigned long logicalAddress) {
 	// First 20 bits of logical address
 	// Bitwise shift right 12 bits to get the first 20 bits, as the last 12 bits are discarded
 	return logicalAddress >> OFFSETBITS;
 
 }
 
-void printPhysicalAddress(int frameID, unsigned long logicalAddress){
+void printPhysicalAddress(int frameID, unsigned long logicalAddress) {
-	printf("%lu -> %i\n",logicalAddress,frameID*PAGESIZE+getPageOffsetAddress(logicalAddress));
+	printf("%lu -> %i\n", logicalAddress, frameID * PAGESIZE + getPageOffsetAddress(logicalAddress));
 }
 
-double computeFormula(){
+double computeFormula() {
 	// probabilityOfNoPageFault ∗ 10 + probabilityOfMajorPageFaultWithOneCopy ∗ 1000 + probabilityOfMajorPageFaultWithTwoCopyOperations ∗ 3000
-	double probabilityOfNoPageFault = 1 - (double)pageFault/(pageFault+pageHits);
+	double probabilityOfNoPageFault = 1 - (double) pageFault / (pageFault + pageHits);
-	double probabilityOfMajorPageFaultWithOneCopy = (double)pageFault/(pageFault+pageHits)*(1-(double)pagesSwapped/pageFault);
+	double probabilityOfMajorPageFaultWithOneCopy = (double) pageFault / (pageFault + pageHits) * (1 - (double) pagesSwapped / pageFault);
-	double probabilityOfMajorPageFaultWithTwoCopyOperations = (double)pageFault/(pageFault+pageHits)*(double)pagesSwapped/pageFault;
+	double probabilityOfMajorPageFaultWithTwoCopyOperations = (double) pageFault / (pageFault + pageHits) * (double) pagesSwapped / pageFault;
-	return probabilityOfNoPageFault*10 + probabilityOfMajorPageFaultWithOneCopy*1000 + probabilityOfMajorPageFaultWithTwoCopyOperations*3000;
+	return probabilityOfNoPageFault * 10 + probabilityOfMajorPageFaultWithOneCopy * 1000 + probabilityOfMajorPageFaultWithTwoCopyOperations * 3000;
 }
 
 // Int so we can return the index of the frame if it is in the frames array
-int isInFrames(int pageNumber){
+int isInFrames(int pageNumber) {
-	for (int i = 0; i < framesSize; i++){
+	for (int i = 0; i < framesSize; i++) {
-		if (frames[i].pageNumber == pageNumber){
+		if (frames[i].pageNumber == pageNumber) {
 			return i;
 		}
 	}
 	return -1;
 }
 
-int swapOut(){
+// Swap out the least recently used frame
+// Returns the index of the frame that was swapped out
+int swapOut() {
 	// Find the least recently used frame
 	int leastRecentlyUsed = 0x7FFFFFFF;
 	int leastRecentlyUsedIndex = -1;
-	for (int i = 0; i < framesSize; i++){
+	for (int i = 0; i < framesSize; i++) {
-		if (frames[i].lastUsed < leastRecentlyUsed){
+		if (frames[i].lastUsed < leastRecentlyUsed) {
 			leastRecentlyUsed = frames[i].lastUsed;
 			leastRecentlyUsedIndex = i;
 		}
 	}
 	// Swap out is implied, so we increment pageSwapped
+	// If the frame is dirty, we need to write it to disk, so we increment pagesSwapped
 	if (frames[leastRecentlyUsedIndex].dirty) {
 		pagesSwapped++;
 	}
@@ -74,10 +76,12 @@ int swapOut(){
 	return leastRecentlyUsedIndex;
 }
 
-int swapIn(int pageNumber){
+// Swap in a page
+// Returns the index of the frame that was swapped in
+int swapIn(int pageNumber) {
 	// Find the first empty frame
-	for (int i = 0; i < framesSize; i++){
+	for (int i = 0; i < framesSize; i++) {
-		if (frames[i].pageNumber == -1){
+		if (frames[i].pageNumber == -1) {
 			pageFault++;
 			frames[i].pageNumber = pageNumber;
 			return i;
@@ -90,64 +94,63 @@ int swapIn(int pageNumber){
 	return frameID;
 }
 
-
+// Read from an address
-
+void readFromAddress(unsigned long logicalAddress) {
-void readFromAddress(unsigned long logicalAddress){
 	unsigned int pageNumber = getPageNumber(logicalAddress);
 	int frameID = isInFrames(pageNumber);
-	if (isInFrames(pageNumber) == -1){
+	if (isInFrames(pageNumber) == -1) {
 		frameID = swapIn(pageNumber);
-	}
+	} else {
-	else{
 		pageHits++;
 	}
 	frames[frameID].lastUsed = time;
-	printPhysicalAddress(frameID,logicalAddress);
+	printPhysicalAddress(frameID, logicalAddress);
 }
 
-void writeToAddress(unsigned long logicalAddress){
+// Write to an address, only difference is that we set the dirty bit to true
+void writeToAddress(unsigned long logicalAddress) {
 	unsigned int pageNumber = getPageNumber(logicalAddress);
 	int frameID = isInFrames(pageNumber);
-	if (isInFrames(pageNumber) == -1){
+	if (isInFrames(pageNumber) == -1) {
 		frameID = swapIn(pageNumber);
-	}
+	} else {
-	else{
 		pageHits++;
 	}
 	frames[frameID].dirty = true;
 	frames[frameID].lastUsed = time;
-	printPhysicalAddress(frameID,logicalAddress);
+	printPhysicalAddress(frameID, logicalAddress);
 }
 
 
-int main(int argc, char** argv){
+int main(int argc, char **argv) {
-	//Disable printf buffering
+	//Disable printf buffering for easier debugging
 	setbuf(stdout, NULL);
 
-    framesSize = atoi(argv[1]);
+	framesSize = atoi(argv[1]);
-	frames = calloc(framesSize,sizeof(frameEntry));
+	frames = calloc(framesSize, sizeof(frameEntry));
 	// Initialize frames to -1, so we can check if a frame is empty
-	for (int i = 0; i < framesSize; i++){
+	for (int i = 0; i < framesSize; i++) {
 		frames[i].pageNumber = -1;
 		frames[i].lastUsed = -1;
 		frames[i].dirty = false;
 	}
-    unsigned long logicalAddress;
+	unsigned long logicalAddress;
-    char operation;
+	char operation;
-    printf("Logical addresses -> Physical addresses:\n");
+	printf("Logical addresses -> Physical addresses:\n");
-    while(EOF != scanf("%c %lu\n",&operation,&logicalAddress) )
+	while (EOF != scanf("%c %lu\n", &operation, &logicalAddress)) {
-    {
+		if (operation == 'r') {
-        if (operation == 'r')
+			readFromAddress(logicalAddress);
-        {
+		} else {
-            readFromAddress(logicalAddress);
+			writeToAddress(logicalAddress);
-        }
+		}
-        else
-        {
-            writeToAddress(logicalAddress);
-        }
 		time++;
-    }
+	}
 
-    printf("\nStats:\nmajor page faults = %u\npage hits = %u\npages swapped out = %u\nEffective Access Time = %.3lf\n",pageFault,pageHits,pagesSwapped, computeFormula());
+	printf("\nStats:\nmajor page faults = %u\npage hits = %u\npages swapped out = %u\nEffective Access Time = %.3lf\n",
-    return 0;
+		   pageFault,
+		   pageHits,
+		   pagesSwapped,
+		   computeFormula()
+		   );
+	return EXIT_SUCCESS;
 }

Assignment7/student_out/algo-check-o-l.out

@@ -1,14 +0,0 @@
-Logical addresses -> Physical addresses:
-1124955998 -> 1886
-794845611 -> 4523
-1540976830 -> 8382
-1081961846 -> 3446
-1124957700 -> 7684
-794845440 -> 8448
-1540976645 -> 5
-
-Stats:
-major page faults = 7
-page hits = 0
-pages swapped out = 0
-Effective Access Time = 1000.000

Assignment7/student_out/discard-test-1.out

@@ -1,15 +0,0 @@
-Logical addresses -> Physical addresses:
-1622650073 -> 3289
-1144108930 -> 1922
-101027544 -> 3800
-1784484492 -> 652
-823378840 -> 920
-197493099 -> 363
-1954899097 -> 1177
-530511967 -> 2143
-
-Stats:
-major page faults = 8
-page hits = 0
-pages swapped out = 0
-Effective Access Time = 1000.000

Assignment7/student_out/discard-test-2.out

@@ -1,15 +0,0 @@
-Logical addresses -> Physical addresses:
-1622650073 -> 3289
-1144108930 -> 6018
-101027544 -> 3800
-1784484492 -> 4748
-823378840 -> 920
-197493099 -> 4459
-1954899097 -> 1177
-530511967 -> 6239
-
-Stats:
-major page faults = 8
-page hits = 0
-pages swapped out = 0
-Effective Access Time = 1000.000

Assignment7/student_out/fromText.out

@@ -1,14 +0,0 @@
-Logical addresses -> Physical addresses:
-1124955998 -> 1886
-794845611 -> 4523
-1540976830 -> 8382
-1081961846 -> 3446
-1124957700 -> 7684
-794845440 -> 8448
-1540976645 -> 5
-
-Stats:
-major page faults = 7
-page hits = 0
-pages swapped out = 1
-Effective Access Time = 1285.714

Assignment7/student_out/major-test-1.out

@@ -1,15 +0,0 @@
-Logical addresses -> Physical addresses:
-1622650073 -> 3289
-1144108930 -> 1922
-101027544 -> 3800
-1784484492 -> 652
-823378840 -> 920
-197493099 -> 363
-1954899097 -> 1177
-530511967 -> 2143
-
-Stats:
-major page faults = 8
-page hits = 0
-pages swapped out = 7
-Effective Access Time = 2750.000

Assignment7/student_out/major-test-2.out

@@ -1,15 +0,0 @@
-Logical addresses -> Physical addresses:
-1622650073 -> 3289
-1144108930 -> 6018
-101027544 -> 3800
-1784484492 -> 4748
-823378840 -> 920
-197493099 -> 4459
-1954899097 -> 1177
-530511967 -> 6239
-
-Stats:
-major page faults = 8
-page hits = 0
-pages swapped out = 6
-Effective Access Time = 2500.000

Assignment7/student_out/page-hit-test.out

@@ -1,15 +0,0 @@
-Logical addresses -> Physical addresses:
-1725896583 -> 1927
-1725896583 -> 1927
-1725898287 -> 3631
-1725894961 -> 305
-1725896008 -> 1352
-1725898705 -> 4049
-1725898485 -> 3829
-1725897033 -> 2377
-
-Stats:
-major page faults = 1
-page hits = 7
-pages swapped out = 0
-Effective Access Time = 133.750

Assignment7/student_out/sample_output.out

@@ -1,14 +0,0 @@
-Logical addresses -> Physical addresses:
-1124955998 -> 1886
-794845611 -> 4523
-1540976830 -> 8382
-1124957700 -> 3588
-1081961846 -> 7542
-794845440 -> 8448
-1540976645 -> 5
-
-Stats:
-major page faults = 6
-page hits = 1
-pages swapped out = 0
-Effective Access Time = 858.571

Assignment7/student_out/sample_output_2.out

@@ -1,14 +0,0 @@
-Logical addresses -> Physical addresses:
-1124955998 -> 1886
-794845611 -> 4523
-1540976830 -> 8382
-1124957700 -> 3588
-1081961846 -> 7542
-794845440 -> 8448
-1540976645 -> 5
-
-Stats:
-major page faults = 6
-page hits = 1
-pages swapped out = 3
-Effective Access Time = 1715.714