void Spread::StartSpread()
{
double remainTime;// 剩余扩散时间
int oldLoad;
struct timeval now1,now2;
struct timespec timeout;// pthread_cond_timedwait
pthread_mutex_lock(&mMutex);
oldLoad = mSpreadNode.currentLoad;
remainTime = mSpreadNode.fileLength * oldLoad * 1.0 / mSpreadNode.diskBand;
//复制开始时间
mSpreadNode.startTime = getRelativeTime();
while(remainTime > 0)
{
oldLoad = mSpreadNode.currentLoad;// 睡眠前记录当前负载
gettimeofday(&now1, NULL);
RemainTime(remainTime, timeout, now1);
int ret = pthread_cond_timedwait(&mCond, &mMutex, &timeout);
if (ETIMEDOUT == ret)
{
remainTime = 0.0;
break;
}
else if (ret != 0)
{
LOG_INFO("pthread_cond_timedwait error,exit.");
exit(1);
}
gettimeofday(&now2, NULL);
double timeslips = getTimeSlips(&now2, &now1);
remainTime -= timeslips;
if(remainTime < 0)
break;
remainTime = remainTime * mSpreadNode.currentLoad / oldLoad;
}
// 复制结束时间
mSpreadNode.endTime = getRelativeTime();
mSpreadNode.isFinished = true;
pthread_mutex_unlock(&mMutex);
}
int
LFRUManager::duplicateMethod(unsigned int serverId) {
unsigned int needSpreadFile;
double minWeight, curWeight;
minWeight = 1000000.0;
string logStr = "server[" + numToString(serverId) + "] is overload";
serverLog.writeSystemLog(logStr);
//get the file need to spread
struct timeval callTime;
gettimeofday(&callTime, NULL);
ostringstream logStream;
for (unsigned int i = 0; i < LFRUFileList.size(); i++) {
if (LFRUFileList[i]->serverId != serverId)
continue;
logStream<<"for server "<<serverId<<",file "<<LFRUFileList[i]->fileId<<endl;
logStream<<"\tcallTime:"<<callTime.tv_sec<<":"<<callTime.tv_usec<<" ";
logStream<<"t0:"<<t0.tv_sec<<":"<<t0.tv_usec<<" ";
logStream<<"vtime:"<<LFRUFileList[i]->vtime.tv_sec<<":"<<
LFRUFileList[i]->vtime.tv_usec<<" ";
logStream<<"count:"<<LFRUFileList[i]->count<<" ";
double fk = getTimeSlips(&callTime, &t0) / (double(LFRUFileList[i]->count * 1000000.0));
double rk = getTimeSlips(&callTime, &(LFRUFileList[i]->vtime)) / 1000000.0;
curWeight = period - getTimeSlips(&callTime, &t0) / 1000000.0;
curWeight = curWeight * rk / (double) period;
curWeight += getTimeSlips(&callTime, &t0) * fk / (1000000.0 * period);
logStream<<"Fk:"<<fk<<",rk:"<<rk<<",weight : "<<curWeight<<" ";
//logStr = "in server[" + numToString(serverId) + "],the count of file " +
//numToString(DWFileList[i]->fileId) + " is " + numToString(curCount);
//serverLog.writeResourceLog(logStr);
if (minWeight > curWeight) {
minWeight = curWeight;
needSpreadFile = LFRUFileList[i]->fileId;
}
logStream<<" minWeight = "<<minWeight<<",need spread file ="<<needSpreadFile<<endl;
}
serverLog.writeResourceLog(logStream.str());
logStr = "server[" + numToString(serverId) + "] chose file[" + numToString(needSpreadFile) + "] to spread";
serverLog.writeResourceLog(logStr);
//choose the machine that have the minLoad and don't have the file
vector<unsigned int > containList;
getServerList(needSpreadFile, containList);
vector<unsigned int> noList;
noList.clear();
for (unsigned int i = 0; i < subServerNum; i++) {
bool isContain = false;
for (unsigned int j = 0; j < containList.size(); j++) {
if (containList[j] == i) {
isContain = true;
break;
}
}
if (isContain == false) {
noList.push_back(i);
}
}
int targetServer = lb->getMinLoadServer(noList);
if (targetServer < 0) {
logStr = "no server to duplicate";
serverLog.writeResourceLog(logStr);
return -1;
}
logStr = "the spread target server is server[" + numToString(targetServer) + "]";
serverLog.writeResourceLog(logStr);
//should have some transport time
lb->addFileToSubServer(needSpreadFile, targetServer);
addNewServer(needSpreadFile, targetServer);
LFRUFileInfo *fileInfo = new LFRUFileInfo(needSpreadFile, targetServer);
if (fileInfo != NULL)
LFRUFileList.push_back(fileInfo);
lb->printFileList();
return 0;
}
