[英]c++ Fast IPC - boost message queue seems slow?
我有一個問題,我似乎無法解決自己。 我有一個在while循環中計算數據的Process1。 此過程必須盡快執行。 我需要在Process1中計算出的數據用於以后的分析,並且寫入文件的速度很慢。
我從未使用過IPC,但我認為這是一種將Process1中的數據存儲在內存中並從其他非時間緊迫的Process2(獨立程序)訪問數據並將日期寫入文件的好方法。
我創建了我的小測試程序(以了解IPC),因此:
我創建的當前程序速度太慢了,通過IPC發送消息時速度慢了6倍。 目前,我在每個“ TimeStep”處僅傳遞三個浮點數,但可能是100。運行時可能是10.000。
要做的事情:如果有人可以引導我朝正確的方向前進,我將感到高興。 下面的代碼正在工作,因為它不太漂亮,可能會很幸運。
我需要找到一個盡可能快的解決方案,但不必是實時的。 由於我不是專業程序員,因此我還需要妥協其復雜性,因為我需要了解自己在做什么。
希望有人能幫忙。
碼:
處理1:
#include <boost/interprocess/ipc/message_queue.hpp>
#include <boost/date_time.hpp>
#include <iostream>
#include <vector>
#include <windows.h>
#include <string>
#include <ctime>
#include <iostream>
#include <fstream>
#include <map>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#include <time.h>
#pragma comment(lib, "user32.lib")
using namespace std;
using namespace boost::interprocess;
using namespace boost::posix_time;
using boost::posix_time::microsec_clock;
bool InitCreateMsgQ()
{
bool initOK = false;
//Create a msgQ for parsing data
try
{
message_queue::remove("msgQData");
//Create a message_queue.
message_queue mqData
(open_or_create //create q
,"msgQData" //name
,1000000 //max message number
,sizeof(float) //max message size
);
initOK = true;
}
catch(interprocess_exception &ex)
{
return false;
}
//Create State
try
{
message_queue::remove("msgState");
//Create a message_queue.
message_queue mqState
(open_or_create //create q
,"msgState" //name
,1 //max message number
,sizeof(int) //max message size
);
initOK = true;
}
catch(interprocess_exception &ex)
{
return false;
}
return initOK;
}
bool SetState(int state)
{
bool timeout = true;
try
{
//Open a message queue.
message_queue mqState
(open_only //only oepn q
,"msgState" //name
);
timeout = !mqState.timed_send(&state, sizeof(int), 0,
ptime(boost::posix_time::microsec_clock::universal_time()) + milliseconds(100));
}
catch(interprocess_exception &ex)
{
message_queue::remove("msgState");
timeout = true;
}
return timeout;
}
bool SetData(float data)
{
bool timeout = true;
try
{
//Open a message queue.
message_queue mqData
(open_only //only oepn q
,"msgQData" //name
);
timeout = !mqData.timed_send(&data, sizeof(float), 0,
ptime(boost::posix_time::microsec_clock::universal_time()) + milliseconds(1));
//mqData.send(&data, sizeof(float), 0);
}
catch(interprocess_exception &ex)
{
message_queue::remove("msgQData");
timeout = true;
}
return timeout;
}
int main ()
{
time_t start,end;
int runTime = 0; //just for testing
int dummyState = 2;
float x;
int state = 0;
if (InitCreateMsgQ()){state = 1;} //If all msQ ok set state 1
if (SetState(state)){state = 0;}// If timeout to set state go to state 0
//Do twice to get error if observer is not started
if (SetState(dummyState)){state = 0;}// Set Dummy state for obersver
// If timeout to set state go to state 0
time (&start);
//Runtime!
while(runTime<1000)
{
switch (state)
{
case 0:
state = 0;//force next state 0 - should not be needed
//Do nothing and break loop if monitor tool is not ready
break;
case 1:
state = 1;
cout << "Try SEND DATA" << endl;
for (int i = 0; i < 3; i++)
{
x = rand() % 100;
if (SetData(x)){state = 0;}
}
break;
default:
break;
}
runTime++;
cout << "runTime: " << runTime <<" state: " << state << endl;
}
message_queue::remove("msgQData");
message_queue::remove("msgState");
cout << "done - state: " << state << endl;
time (&end);
double dif = difftime (end,start);
printf ("Elasped time is %.2lf seconds.", dif );
getchar();
}
過程2:
#include <boost/interprocess/ipc/message_queue.hpp>
#include <boost/date_time.hpp>
#include <iostream>
#include <vector>
#include <windows.h>
#include <string>
#include <ctime>
#include <iostream>
#include <fstream>
#include <map>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#include <time.h>
#pragma comment(lib, "user32.lib")
using namespace std;
using namespace boost::interprocess;
using namespace boost::posix_time;
using boost::posix_time::microsec_clock;
ofstream debugOut; // Output file for debug (DEBUG)
int getState()
{
int state = 0;
bool timeout = true;
try
{
//Open a message queue.
message_queue mqState
(open_only //only oepn q
,"msgState" //name
);
unsigned int priority;
message_queue::size_type recvd_size;
timeout = !mqState.try_receive(&state, sizeof(state), recvd_size, priority);
}
catch(interprocess_exception &ex)
{
timeout = true;
}
if(timeout){state = 0;}
return state;
}
float getData()
{
float Data = -123456;
bool timeout = true;
try
{
//Open a message queue.
message_queue mqData
(open_only //only oepn q
,"msgQData" //name
);
unsigned int priority;
message_queue::size_type recvd_size;
//Receive the data
//mqData.try_receive(&Data, sizeof(Data), recvd_size, priority);
timeout = !mqData.timed_receive(&Data, sizeof(Data), recvd_size, priority,
ptime(boost::posix_time::microsec_clock::universal_time()) + milliseconds(10));
}
catch(interprocess_exception &ex)
{
timeout = true;
}
if(timeout){Data = -123456;}
return Data;
}
int main ()
{
int state = 0;
int maxRunTime = 10;
float Data;
float DataArray[100000];
debugOut.open("IPCWriteTest.txt", std::ios::trunc);
debugOut.close();
while(true)
{
switch (state)
{
case 0:
//Do nothing - data not ready state
if(getState() == 1)
{
state = 1;
cout << "State: 1" <<endl;
} //If all msQ ok set state 1
else{state = 0;}
break;
case 1:
for (int runTime = 0; runTime < maxRunTime; runTime++)
{
cout << "runTime: " << runTime << " Data: ";
for (int i = 0; i < 3; i++)
{
Data = getData();
cout << Data << " ";
DataArray[runTime]=Data;
}
cout << endl;
}
debugOut.open("IPCWriteTest.txt", std::ios::app);
for (int runTime = 0; runTime < maxRunTime; runTime++)
{
debugOut << "runTime: " << runTime << " Data: ";
for (int i = 0; i < 3; i++)
{
debugOut << DataArray[runTime] << " ";
}
debugOut << endl;
}
debugOut.close();
state = 0;
break;
default:
break;
}
}
std::cout << "done" << endl;
getchar();
}
您正在為每個操作打開隊列。
您應該嘗試打開一次並傳遞對所有相關代碼的引用(通常您會將其存儲為類中的成員)。
同樣,有單獨的隊列也是減慢速度的秘訣。 在我看來,您正在“濫用” mqState
作為interprocess::condition_variable
或信號量:
像這樣將異常轉換為乏味的錯誤代碼無論如何都不是很有效。 您正在手動執行異常處理應執行的操作。
此外,將調試消息跟蹤到標准輸出這一事實將大大減慢該程序的速度, 尤其是在Windows上
同樣的事情,對於debugOutput
文件,可能不應該連續重新打開它。
被三重“硬循環”是很奇怪的。 如果是隊列,則一次只彈出1條消息。 如果消息“邏輯上”由三個浮動組成,請發送包含三個浮動的消息。 現在,我什至認為這是一個錯誤:
for (int i = 0; i < 3; i++) {
data = getData();
std::cout << data << " ";
DataArray[runTime] = data;
}
它將三個不同的值分配給同一索引( runTime
)...
我“查看”(清理后)的生產者代碼:
#include <boost/date_time.hpp>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <fstream>
#include <algorithm>
#include <iterator>
#include <iostream>
#include <map>
#include <string>
#include <vector>
namespace bip = boost::interprocess;
namespace pt = boost::posix_time;
struct QueueLogic {
bool forced_remove = bip::message_queue::remove("msgQData");
bip::message_queue mqData{ bip::open_or_create, "msgQData", 1000000, sizeof(float) };
bool SetData(float data) {
return !mqData.timed_send(&data, sizeof(float), 0, pt::ptime(pt::microsec_clock::universal_time()) + pt::milliseconds(1));
}
};
#include <boost/chrono.hpp>
#include <boost/chrono/chrono_io.hpp>
using Clock = boost::chrono::high_resolution_clock;
int main() {
std::vector<float> pre_calculated;
std::generate_n(back_inserter(pre_calculated), 10000*100, [] { return rand()%100; });
auto start = Clock::now();
try {
QueueLogic instance;
for (auto v : pre_calculated)
instance.SetData(v);
} catch(std::exception const& e) {
std::cout << "Exception thrown: " << e.what() << "\n";
bip::message_queue::remove("msgQData");
throw;
}
auto end = Clock::now();
std::cout << boost::chrono::duration_cast<boost::chrono::milliseconds>(end-start) << "\n";
}
消費者代碼:
#include <iostream>
#include <fstream>
#include <vector>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <boost/date_time.hpp>
using namespace std;
namespace bip = boost::interprocess;
namespace pt = boost::posix_time;
#include <boost/chrono.hpp>
#include <boost/chrono/chrono_io.hpp>
using Clock = boost::chrono::high_resolution_clock;
struct ObserverLogic {
bip::message_queue mqData{bip::open_only, "msgQData"};
float getData() {
float data;
bip::message_queue::size_type recvd_size;
unsigned int priority;
if (!mqData.timed_receive(&data, sizeof(data), recvd_size, priority,
pt::ptime(pt::microsec_clock::universal_time()) + pt::milliseconds(10)))
{
throw std::runtime_error("timeout in timed_receive");
}
return data;
}
};
int main() {
std::vector<float> DataArray;
DataArray.reserve(100000);
ObserverLogic instance;
try {
while (DataArray.size() <= 100000) {
DataArray.push_back(instance.getData());
}
} catch (std::exception const &e) {
std::cout << "Exception caught: " << e.what() << "\n";
}
std::cout << "Received " << DataArray.size() << " messages\n";
std::copy(DataArray.begin(), DataArray.end(), std::ostream_iterator<float>(std::cout, "; "));
std::cout << "\n\ndone" << std::endl;
}
筆記
實時
1
-Coliru上不允許共享內存
請在下面輸入我的更新代碼:使用MSVC14進行編譯。
我現在只有一個問題。 如果我在生產者運行時關閉我的消費者,它會停止嗎? 不知道為什么。
制片人
#include <boost/date_time.hpp>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <fstream>
#include <algorithm>
#include <iterator>
#include <iostream>
#include <map>
#include <string>
#include <vector>
#include <time.h>
#include <windows.h>
namespace bip = boost::interprocess;
namespace pt = boost::posix_time;
struct QueueLogic
{
//DataConfig Setup
bool forced_removeDataConfig = bip::message_queue::remove("msgDataConfig");
bip::message_queue mqDataConfig{ bip::open_or_create, "msgDataConfig", 2, sizeof(float) };
bool SetDataConfig(float data) {
return !mqDataConfig.timed_send(&data, sizeof(float), 0, pt::ptime(pt::microsec_clock::universal_time()) + pt::milliseconds(1));
}
//Data Setup
bool forced_remove = bip::message_queue::remove("msgQData");
bip::message_queue mqData{ bip::open_or_create, "msgQData", 1000000, sizeof(float) };
bool SetData(float data) {
return !mqData.timed_send(&data, sizeof(float), 0, pt::ptime(pt::microsec_clock::universal_time()) + pt::milliseconds(1));
}
};
int main()
{
time_t start, end;
time(&start);
float noVarsToMonitor = 10.f;
float minTimeStep = 1.f;// 0.001f;
std::vector<float> pre_calculated;
std::vector<float> data_config;
//Set Vars to monitor
data_config.push_back(noVarsToMonitor); //Add noVars as first param in vector
data_config.push_back(minTimeStep); //Add noVars as first param in vector
//Parse parameters into vector
std::generate_n(back_inserter(pre_calculated), noVarsToMonitor, [] { return rand() % 100; });
//Create instance of struct
QueueLogic instance;
//Setup data config
try
{
for (auto v : data_config)
{
instance.SetDataConfig(v);
}
}
catch (std::exception const& e)
{
std::cout << "Exception thrown: " << e.what() << "\n";
bip::message_queue::remove("msgQData");
bip::message_queue::remove("msgDataConfig");
throw;
}
//Get Data
for (size_t i = 0; i < 1000; i++) //simulate that code will be called 1000 times after data is recalculated
{
try
{
for (auto v : pre_calculated)
{
instance.SetData(v);
}
std::cout << "case: " << i << std::endl;
Sleep(20); //sleep to test code including consumer
}
catch (std::exception const& e)
{
std::cout << "Exception thrown: " << e.what() << "\n";
bip::message_queue::remove("msgQData");
bip::message_queue::remove("msgDataConfig");
throw;
}
}
time(&end);
double dif = difftime(end, start);
printf("Elasped time is %.2lf seconds.", dif);
getchar();
}
消費者:
#include <iostream>
#include <fstream>
#include <vector>
#include <windows.h>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <boost/date_time.hpp>
using namespace std;
namespace bip = boost::interprocess;
namespace pt = boost::posix_time;
struct ObserverLogic
{
//Get Config Data
bip::message_queue mqDataConfig{ bip::open_only, "msgDataConfig" };
float getDataConfig()
{
float data;
bip::message_queue::size_type recvd_size;
unsigned int priority;
if (!mqDataConfig.timed_receive(&data, sizeof(data), recvd_size, priority,
pt::ptime(pt::microsec_clock::universal_time()) + pt::milliseconds(250)))
{
throw std::runtime_error("timeout in timed_receive");
}
return data;
}
//Get Var Data
bip::message_queue mqData{ bip::open_only, "msgQData" };
float getData()
{
float data;
bip::message_queue::size_type recvd_size;
unsigned int priority;
if (!mqData.timed_receive(&data, sizeof(data), recvd_size, priority,
pt::ptime(pt::microsec_clock::universal_time()) + pt::milliseconds(250)))
{
throw std::runtime_error("timeout in timed_receive");
}
return data;
}
};
int main() {
std::vector<float> DataArray;
int count = 0;
float maxMonitorTime = 10.f;
DataArray.reserve(100000);
//Fetch this from Producer
float noVarsToMonitor = 0.f;
float minTimeStep = 0.f;
float maxSimSamples = 0.f;
while (true)
{
try
{
ObserverLogic instance;
//Get Numbers of vars to monitor - used another thread!
noVarsToMonitor = instance.getDataConfig();
minTimeStep = instance.getDataConfig();
maxSimSamples = (noVarsToMonitor*(maxMonitorTime * floor((1 / minTimeStep) + 0.5)))-1;
std::cout << "noVarsToMonitor: " << noVarsToMonitor << std::endl;
std::cout << "minTimeStep: " << minTimeStep << std::endl;
std::cout << "maxSimSamples: " << maxSimSamples << std::endl;
std::ofstream ofs("IPQ_Debug.log", std::ios::trunc); //Only clear when data is ready from Producer
//Get Var Data below here:
try
{
while (DataArray.size() <= maxSimSamples)
{
float value = instance.getData();
DataArray.push_back(value);
ofs << value << "; ";
count++;
if (count>noVarsToMonitor - 1) //Split Vector to match no Vars pr. Timestep
{
ofs << std::endl;
count = 0;
}
}
std::cout << "Received " << DataArray.size() << " messages\n";
std::cout << "\n\ndone" << std::endl;
std::cout << std::endl;
}
catch (std::exception const &e)
{
std::cout << "Exception caught: " << e.what() << "\n";
}
}
catch (std::exception const &e)
{
std::cout << "Exception caught: " << e.what() << "\n";
}
std::cout << "Wait 5 seconds to try fetch again" << "\n";
Sleep(5000); //sleep and wait to run loop again before looking at for msqQ
}
getchar();
}
輸出到txt:
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
41; 67; 34; 0; 69; 24; 78; 58; 62; 64;
然后可以針對“模擬時間”繪制輸出,將數據保留在正確的列和行中。
它可能仍然不是很漂亮的代碼,但是我仍在學習中,我感謝我在第一篇文章中獲得的支持。 請隨時發表評論
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