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Reference Guide
stressThreadPool.C File Reference

Detailed Description

Usage:

root [0] .L stressThreadPool.C++
root [1] stressThreadPool(5, true)

where 5 is a number of Threads in the pool there will be then nThreads * 10 tasks pushed to the test

// STD
#include <iostream>
#include <iterator>
#include <vector>
#ifndef _WIN32
#include <unistd.h>
#endif
// ThreadPool
#include "TThreadPool.h"
// ROOT
#include "TThread.h"
//=============================================================================
using namespace std;
//=============================================================================
// Don't set it less than 1, otherwise autotest won't be able to detect whether tests were successful or not
const size_t g_sleeptime = 2; // in secs.
const size_t g_multTasks = 10;
//=============================================================================
enum EProc {start, clean};
class TTestTask: public TThreadPoolTaskImp<TTestTask, EProc> {
public:
bool runTask(EProc /*_param*/) {
m_tid = TThread::SelfId();
TThread::Sleep(g_sleeptime, 0L);
return true;
}
unsigned long threadID() const {
return m_tid;
}
private:
unsigned long m_tid;
};
ostream &operator<< (ostream &_stream, const TTestTask &_task)
{
_stream << _task.threadID();
return _stream;
}
//=============================================================================
void stressThreadPool(size_t _numThreads = 5, bool _needDbg = false)
{
size_t numTasks(_numThreads * g_multTasks);
TThreadPool<TTestTask, EProc> threadPool(_numThreads, _needDbg);
vector <TTestTask> tasksList(numTasks);
// Pushing 4 * numTasks task in the pool
// We want to dain the task queue before pushing a next bunch of tasks (just to show you a Drain method ;) )
for (size_t j = 0; j < 4; ++j )
{
cout << "+++++++++ Starting iteration #" << j << " ++++++++++++"<< endl;
for (size_t i = 0; i < numTasks; ++i) {
threadPool.PushTask(tasksList[i], start);
}
cout << "\n ****** Drain the tasks queue ******" << endl;
threadPool.Drain();
}
cout << "\n Stopping..." << endl;
threadPool.Stop(true);
// ostream_iterator<TTestTask> out_it( cout, "\n" );
// copy( tasksList.begin(), tasksList.end(),
// out_it );
typedef map<unsigned long, size_t> counter_t;
counter_t counter;
{
vector <TTestTask>::const_iterator iter = tasksList.begin();
vector <TTestTask>::const_iterator iter_end = tasksList.end();
for (; iter != iter_end; ++iter) {
counter_t::iterator found = counter.find(iter->threadID());
if (found == counter.end())
counter.insert(counter_t::value_type(iter->threadID(), 1));
else {
found->second = found->second + 1;
}
}
}
cout << "\n************* RESULT ****************" << endl;
counter_t::const_iterator iter = counter.begin();
counter_t::const_iterator iter_end = counter.end();
bool testOK = true;
for (; iter != iter_end; ++iter) {
cout << "Thread " << iter->first << " was used " << iter->second << " times\n";
// each thread suppose to be used equal amount of time,
// exactly (g_numTasks/g_numThreads) times
if (iter->second != g_multTasks)
testOK = false;
}
cout << "ThreadPool: the simple test status: " << (testOK ? "OK" : "Failed") << endl;
}
Author
Victor Perevovchikov

Definition in file stressThreadPool.C.