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runwatch.cpp
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runwatch.cpp
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#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string>
#include <vector>
#include <chrono>
#include <sstream>
#include <fstream>
#include <list>
#include <iostream>
#include <cmath>
#include <atomic>
#include <thread>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
using namespace std::chrono;
class Timer {
private:
static double startTime;
public:
static void init(double start = -1) {
startTime = start == -1 ? now() : start;
}
static double now() {
return 0.001 * 0.001 * 0.001 * system_clock::now().time_since_epoch().count();
}
/**
* Returns elapsed time since program start (since MyMpi::init) in seconds.
*/
static float elapsedSeconds() {
return now() - startTime;
}
};
double Timer::startTime;
int mkdirP(const std::string& dir) {
for (size_t i = 0; i < dir.size(); i++) {
if (dir[i] == '/' && i > 0 && i+1 < dir.size()) {
std::string subdir(dir.begin(), dir.begin() + i);
int res = ::mkdir(subdir.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);
if (res != 0 && errno != EEXIST) {
return res;
}
}
}
auto res = ::mkdir(dir.c_str(), S_IRWXU | S_IRWXG | S_IRWXO);
if (res == 0 || errno == EEXIST) return 0;
return res;
}
void pinProcessToCpu(pid_t pid, int firstCpu, size_t numCpus) {
cpu_set_t cpuSet;
CPU_ZERO(&cpuSet);
for (size_t i = 0; i < numCpus; i++) {
CPU_SET(firstCpu+i, &cpuSet);
}
sched_setaffinity(pid, sizeof(cpuSet), &cpuSet);
}
std::vector<pid_t> getRecursiveChildren(pid_t basePid) {
std::vector<pid_t> result;
result.push_back(basePid);
// Get child information for this PID
auto childFile = "/proc/" + std::to_string(basePid) + "/task/"
+ std::to_string(basePid) + "/children";
std::ifstream children_stream(childFile.c_str(), std::ios_base::in);
if (!children_stream.good()) return result;
// Recurse
pid_t childPid;
while (children_stream >> childPid) {
auto childPids = getRecursiveChildren(childPid);
result.insert(result.end(), childPids.begin(), childPids.end());
}
return result;
}
long getResidentSetSize(pid_t pid, bool recurse) {
using std::ios_base;
using std::ifstream;
using std::string;
auto statFile = "/proc/" + std::to_string(pid) + "/stat";
ifstream stat_stream(statFile.c_str(), ios_base::in);
if (!stat_stream.good()) return 0;
// dummy vars for leading entries in stat that we don't care about
string str_pid, comm, state, ppid, pgrp, session, tty_nr;
string tpgid, flags, minflt, cminflt, majflt, cmajflt;
string utime, stime, cutime, cstime, priority, nice;
string O, itrealvalue, starttime;
// the two fields we want
unsigned long vsize = 0;
long rss = 0;
stat_stream >> str_pid >> comm >> state >> ppid >> pgrp >> session >> tty_nr
>> tpgid >> flags >> minflt >> cminflt >> majflt >> cmajflt
>> utime >> stime >> cutime >> cstime >> priority >> nice
>> O >> itrealvalue >> starttime >> vsize >> rss; // don't care about the rest
stat_stream.close();
long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024; // in case x86-64 is configured to use 2MB pages
rss *= page_size_kb;
// Recursively read memory usage of all children
if (recurse) {
auto childFile = "/proc/" + std::to_string(pid) + "/task/" + std::to_string(pid) + "/children";
ifstream children_stream(childFile.c_str(), ios_base::in);
if (!children_stream.good()) return rss;
pid_t childPid;
while (children_stream >> childPid) {
rss += getResidentSetSize(childPid, recurse);
}
}
return rss;
}
void signalProcessAndAllChildren(pid_t pid, int sig) {
auto pids = getRecursiveChildren(pid);
for (pid_t p : pids) {
kill(p, sig);
}
}
struct Process {
int instanceId = -1;
pid_t pid = -1;
float starttime = 0;
float lastLimitCheck = -1;
bool running = false;
size_t koCounter = 0;
int status = 0;
int retval = 0;
float runtimeSecs = 0;
long mempeakKbs = 0;
std::vector<std::string> command;
};
bool allExiting = false;
void handler(int signum) {
allExiting = true;
}
const int STATUS_TIMEOUT = 1;
const int STATUS_MEMOUT = 2;
const int STATUS_RUNNING = 3;
int main(int argc, const char** argv) {
Timer::init();
signal(SIGINT, handler);
signal(SIGTERM, handler);
size_t numProcesses = 1;
size_t threadsPerProcess = 1;
float timelimSecs = 0;
long memlimKbs = 0;
std::string commandsFilename;
std::string outputDir = ".";
bool recurse = false;
bool quiet = false;
// Parse args
for (size_t i = 1; i < (size_t)argc; i++) {
std::string arg(argv[i]);
if (arg == "-p" || arg == "-np" || arg == "--processes") {
arg = argv[++i];
numProcesses = atoi(arg.c_str());
} else if (arg == "-t" || arg == "--threads-per-process") {
arg = argv[++i];
threadsPerProcess = atoi(arg.c_str());
} else if (arg == "-T" || arg == "--timelim") {
arg = argv[++i];
timelimSecs = atof(arg.c_str());
} else if (arg == "-M" || arg == "--memlim") {
arg = argv[++i];
memlimKbs = atoi(arg.c_str());
} else if (arg == "-d" || arg == "--directory") {
arg = argv[++i];
outputDir = arg;
} else if (arg == "-r" || arg == "--recurse-children") {
recurse = true;
} else if (arg == "-q" || arg == "--quiet") {
quiet = true;
} else if (arg[0] != '-') {
// Positional arg: Filename with commands
commandsFilename = arg;
}
}
if (commandsFilename.empty()) {
std::cout << "Usage: runwatch <tasks_file>"
<< " [-p|-np|--processes <num_parallel_processes>]"
<< " [-t|--threads-per-process <num_threads_per_process>]"
<< " [-T|--timelim <timelimit_seconds>]"
<< " [-M|--memlim <rss_memlimit_kilobytes>]"
<< " [-d|--directory <output_log_directory>]"
<< " [-r|--recurse-children]"
<< " [-q|--quiet]" << std::endl;
std::cout << "Each line in <tasks_file> must begin with a unique instance id "
<< "(e.g. the current line number) followed by a whitespace and then "
<< "the command to execute." << std::endl;
return 0;
}
// Pin this process to the slot directly following all worker task slots
pinProcessToCpu(0, /*firstCpu=*/threadsPerProcess*numProcesses, /*numCpus=*/2);
std::vector<Process> activeChildren;
activeChildren.resize(numProcesses);
// Read tasks
std::list<Process> tasks;
std::ifstream infile(commandsFilename);
std::string line;
size_t numDoneTasks = 0;
size_t numTasks = 0;
while (std::getline(infile, line)) {
std::istringstream iss(line);
int instanceId;
if (!(iss >> instanceId)) { break; } // error
tasks.emplace_back();
tasks.back().instanceId = instanceId;
std::string arg;
while (iss >> arg) {
tasks.back().command.push_back(arg);
}
numTasks++;
}
// Recognize finished children in a separate thread
std::thread childExitListener = std::thread([&]() {
int status = 0;
while (!allExiting) {
pid_t finishedPid = waitpid(-1, &status, WNOHANG);
if (finishedPid > 0) {
// Some child finished
float endtime = Timer::elapsedSeconds();
int i = 0;
while (!activeChildren[i].running || activeChildren[i].pid != finishedPid) i++;
assert(i >= 0 && i < (int)activeChildren.size());
auto& child = activeChildren[i];
child.runtimeSecs = endtime - child.starttime;
child.retval = status;
child.running = false;
}
}
});
// Main loop
bool anyActive = false;
while (anyActive || !tasks.empty()) {
anyActive = false;
// For each task slot
for (size_t i = 0; i < activeChildren.size(); i++) {
// Is there an active process at this slot?
if (activeChildren[i].pid > 0) {
auto& child = activeChildren[i];
anyActive = true;
// Did child terminate?
if (!activeChildren[i].running) {
// Create runwatch report line
std::string statusStr = child.status == STATUS_MEMOUT ? "MEMOUT" :
child.status == STATUS_TIMEOUT ? "TIMEOUT" :
"EXIT";
std::stringstream ss;
ss << "RUNWATCH_RESULT " << statusStr
<< " RETVAL " << child.retval << " TIME_SECS " << child.runtimeSecs
<< " MEMPEAK_KBS " << child.mempeakKbs << std::endl;
// Write report to stdout
if (!quiet) std::cout << child.instanceId << " " << ss.str();
// Write report to the instance's log file
std::string instOutfile = outputDir + "/" + std::to_string(activeChildren[i].instanceId) + "/rw";
std::ofstream ofs(instOutfile, std::ios_base::app);
ofs << std::endl << ss.str();
ofs.close();
activeChildren[i].pid = -1;
numDoneTasks++;
if (!quiet) std::cout << child.instanceId << " END ("
<< numDoneTasks << "/" << numTasks << " done)" << std::endl;
} else {
// Active child
float time = Timer::elapsedSeconds();
auto& child = activeChildren[i];
if (allExiting) {
// Forward interruption to child
signalProcessAndAllChildren(child.pid, SIGINT);
continue;
}
if (time - child.lastLimitCheck >= 1.0f) {
// Limit check
child.lastLimitCheck = time;
if (timelimSecs > 0 && time - child.starttime > timelimSecs) {
// Timeout
signalProcessAndAllChildren(child.pid, SIGINT);
child.status = STATUS_TIMEOUT;
child.koCounter++;
} else {
// Check memory limit, update mempeak
long rssKbs = getResidentSetSize(child.pid, recurse);
child.mempeakKbs = std::max(child.mempeakKbs, rssKbs);
if (memlimKbs > 0 && child.mempeakKbs > memlimKbs) {
// Memout
signalProcessAndAllChildren(child.pid, SIGINT);
child.status = STATUS_MEMOUT;
child.koCounter++;
}
}
// Hardkill if unresponsive
if (child.koCounter >= 5)
signalProcessAndAllChildren(child.pid, SIGKILL);
}
}
}
if (allExiting) continue;
// Is this slot currently empty and there are still tasks left?
if (activeChildren[i].pid < 0 && !tasks.empty()) {
// (Re)allocate for next task
activeChildren[i] = tasks.front();
tasks.pop_front();
// Assemble command for execvp
if (!quiet) std::cout << activeChildren[i].instanceId << " BEGIN" << std::endl;
char* const* argv = [&]() {
const char** argv = new const char*[activeChildren[i].command.size()+1];
int j = 0;
for (const auto& arg : activeChildren[i].command) {
argv[j] = arg.c_str();
j++;
}
argv[j] = nullptr;
return (char* const*) argv;
}();
// Create log directory
std::string instanceDir = outputDir + "/" + std::to_string(activeChildren[i].instanceId) + "/";
int res = mkdirP(instanceDir.c_str());
if (res != 0) {
if (!quiet) std::cout << activeChildren[i].instanceId
<< " ERROR: Cannot create directory \"" << instanceDir << "\" - skipping"
<< std::endl;
} else {
// Start the subprocess
pid_t pid = fork();
if (pid == 0) {
// Child:
// Redirect stdout and stderr to log file
int newStdout = open((instanceDir + "rw").c_str(), O_CREAT | O_WRONLY, S_IRWXU);
dup2(newStdout, 1); // stdout
dup2(newStdout, 2); // stderr
// Execute command
execvp(argv[0], argv);
}
// Parent
activeChildren[i].pid = pid;
pinProcessToCpu(pid, threadsPerProcess * i, threadsPerProcess);
activeChildren[i].starttime = Timer::elapsedSeconds();
activeChildren[i].status = STATUS_RUNNING;
activeChildren[i].running = true;
// Clean up
delete[] argv;
anyActive = true;
}
}
}
if (allExiting) break;
}
allExiting = true;
childExitListener.join();
}