From 14819e733226e87fd54de8a07ae8a820ed5dbd55 Mon Sep 17 00:00:00 2001
From: Sara El-Metwally <sarah_almetwally4@mans.edu.eg>
Date: Fri, 11 Mar 2016 17:57:52 -0800
Subject: [PATCH] Added files via upload

---
 memusage.cpp | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 memusage.cpp

diff --git a/memusage.cpp b/memusage.cpp
new file mode 100644
index 0000000..655efea
--- /dev/null
+++ b/memusage.cpp
@@ -0,0 +1,158 @@
+#include <string>
+#include <iostream>
+#include <fstream>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <vector>
+using namespace std;
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+string getAbsolutePath(const char* file, char* path, int mode) {
+	char* tok;
+
+	/*parse the PATH enviroment*/
+	tok = strtok((char*) path, ":");
+	while (tok) {
+		/*form a new absolute path*/
+		string filePath = tok;
+		filePath += "/";
+		filePath += file;
+
+		/*test the file attribute*/
+		if (access(filePath.c_str(), mode) == 0) {
+			return filePath;
+		}
+		/*get the next*/
+		tok = strtok(NULL, ":");
+	}
+	return string("");
+}
+
+int main(int argc, char* argv[]) {
+	if (argc < 2) {
+		cerr << endl << "MEMUSAGE (by Liu Yongchao, liuy@uni-mainz.de) measures the peak virtual and resident memory of a program" << endl
+				 << "--------------------------------------------------------------------------------------------------------" << endl
+		 		 <<"Please specify parameters: program [program argument list]" << endl;
+		return -1;
+	}
+	/*get the command name*/
+	string command = argv[1];
+
+	/*enviroment variables*/
+	string path = getenv("PATH");
+	/*check the existence of the command file*/
+	if (access(command.c_str(), X_OK) != 0) {
+		string newPath = getAbsolutePath((char*) command.c_str(),
+				(char*) path.c_str(), X_OK);
+		if (newPath.length() > 0) {
+			command = newPath;
+		} else {
+			cerr << "Failed to find the specified command: " << command << endl;
+			return -1;
+		}
+	}
+	vector<char*>arglist;
+	for(int i = 1; i < argc; ++i){
+		arglist.push_back(strdup(argv[i]));
+	}
+	arglist.push_back(NULL);
+
+	/*create a thread*/
+	pid_t pid = fork();
+	if (pid == 0) { /*child process*/
+		if (execvp(command.c_str(), arglist.data()) == -1) {
+			cerr << "Failed to launch the command: " << command << endl;
+		}
+		return 0;
+	} else { /*parent process*/
+		if (pid < 0) {
+			cerr
+					<< "Process creating for the external command failed and will use internal command instead"
+					<< endl;
+		} else if (pid > 0) {
+			int status;
+			long peakResidentMem = 0, peakVirtualMem = 0;
+			char buffer[1024];
+			sprintf(buffer, "ps -p %d -o vsize=,rss=", pid);
+			string command = buffer; /*get the command line*/
+
+			/*get the output file name*/
+			sprintf(buffer, ".memusage%d", getpid());
+			string fileName = buffer;
+
+			/*form the command line*/
+			command += " > ";
+			command += fileName;
+			cerr << "command: " << command << endl;
+
+			/*start the main loop*/
+			while (1) {
+				/*wait for a time*/
+				usleep(100);
+				
+				/*check the exit of child process*/
+				waitpid(pid, &status, WNOHANG);
+
+				/*get the resident memory size*/
+				system(command.c_str());
+
+				/*read the first line from the output file*/
+				FILE* fp = fopen(fileName.c_str(), "rb");
+				if (!fp) {
+					cerr << "Failed to open file " << fileName << endl;
+					exit(0);
+				}
+				/*read the file line*/
+				if (fgets(buffer, 1023, fp) == NULL) {
+					cerr << "The child process exited" << endl;
+					break;
+				}
+				/*close the file*/
+				fclose(fp);
+
+				/*parse the line*/
+				for (int i = strlen(buffer) - 1;
+						i >= 0 && (i == '\n' || i == '\r'); --i) {
+					buffer[i] = '\0';
+				}
+				if (strlen(buffer) == 0) {
+					cerr << "The child process exited with buffer length " << strlen(buffer) << endl;
+					break;
+				}
+				/*parse the buffer*/
+				static const char delimiter[] = "\t ";
+				char* tok = strtok(buffer, delimiter);
+				/*get the virtual memory size*/
+				if(!tok){
+					cerr << "It seems that there is an error in the file: " << fileName << endl;
+					break;
+				}
+				long value = atol(tok);
+				peakVirtualMem = max(peakVirtualMem, value);
+				/*get the resident memory*/
+				tok = strtok(NULL, delimiter);
+				if(!tok){
+					cerr << "It seems that there is an error in the file: " << fileName << endl;
+					break;
+				}
+				value = atol(tok);
+				peakResidentMem = max(peakResidentMem, value);
+				
+			}
+
+			/*output the peak resident memory*/
+			cerr << "Peak resident memory is " << peakResidentMem << " KB; " << (double)peakResidentMem / 1024 << " MB; " << (double)peakResidentMem / 1024 / 1024 << " GB" << endl;
+
+			cerr << "Peak virtual memory is " << peakVirtualMem << " KB; " << (double)peakVirtualMem / 1024 << " MB; " << (double)peakVirtualMem / 1024 / 1024 << " GB" << endl;
+
+			/*remove the file*/
+			remove(fileName.c_str());
+
+			return 0;
+		}
+	}
+}
+