/**
* Back-end side of the Spectral Analysis algorithm.
*
* Extracts data from the tracing buffer to build a signal,
* and sends it to the root. Waits for the root to execute
* the analysis and waits for the results. The selected
* periods will be traced, and the rest of the trace buffer
* discarded.
*
* @return 0 on success; -1 if errors;
*/
int SpectralWorker::Run()
{
int tag;
PACKET_PTR p;
int NumDetectedPeriods = 0;
/* Extract all bursts since the last analysis */
BurstsExtractor *ExtractedBursts = new BurstsExtractor(0);
ExtractedBursts->ParseBuffer(
0,
Online_GetAppResumeTime(),
Online_GetAppPauseTime()
);
/* Generate the DurBurst signal from the bursts information */
Signal *DurBurstSignal = new Signal( ExtractedBursts->GetBursts() );
/* DEBUG -- Dump the signal generated at the back-end
stringstream ss;
ss << "signal_backend_" << WhoAmI() << ".txt";
Spectral_DumpSignal( DurBurstSignal->GetSignal(), (char *)ss.str().c_str() ); */
/* Serialize the data and send to the front-end */
DurBurstSignal->Serialize(stSpectral);
/* Receive how many periods were detected */
MRN_STREAM_RECV(stSpectral, &tag, p, SPECTRAL_DETECTED_PERIODS);
PACKET_unpack(p, "%d", &NumDetectedPeriods);
/* Receive each period */
if (NumDetectedPeriods > 0)
{
vector<Period> DetectedPeriods( NumDetectedPeriods );
for (int i=0; i<NumDetectedPeriods; i++)
{
MRN_STREAM_RECV(stSpectral, &tag, p, SPECTRAL_PERIOD);
PACKET_unpack(p, "%f %ld %lf %lf %lf %ld %ld %ld %ld %d %d",
&(DetectedPeriods[i].info.iters),
&(DetectedPeriods[i].info.length),
&(DetectedPeriods[i].info.goodness),
&(DetectedPeriods[i].info.goodness2),
&(DetectedPeriods[i].info.goodness3),
&(DetectedPeriods[i].info.ini),
&(DetectedPeriods[i].info.end),
&(DetectedPeriods[i].info.best_ini),
&(DetectedPeriods[i].info.best_end),
&(DetectedPeriods[i].traced),
&(DetectedPeriods[i].id)
);
}
ProcessPeriods(DetectedPeriods, ExtractedBursts);
}
delete DurBurstSignal;
delete ExtractedBursts;
return 0;
}
void filterOnlineSpectral(
std::vector< PacketPtr >& packets_in,
std::vector< PacketPtr >& packets_out,
std::vector< PacketPtr >& /* packets_out_reverse */,
void ** /* client data */,
UNUSED PacketPtr& params,
const TopologyLocalInfo& top_info)
{
int tag = packets_in[0]->get_Tag();
/* Bypass the implicit filter in the back-ends, there's nothing to merge at this level! */
if (BOTTOM_FILTER(top_info))
{
for (unsigned int i=0; i<packets_in.size(); i++)
{
packets_out.push_back(packets_in[i]);
}
return;
}
/* Process the packets crossing the filter */
switch(tag)
{
case REDUCE_SIGNAL:
{
/* Load N signals up to a maximum chunk size and add them, until all signals are processed */
unsigned int nextSignal = 0;
Signal *SumSignal = new Signal();
while (nextSignal < packets_in.size())
{
vector<Signal *> ChildrenSignals;
int ChunkSize = SumSignal->GetSize();
do
{
/* Unpack next child's signal */
PACKET_PTR cur_packet = packets_in[nextSignal];
Signal *child_Signal = new Signal( cur_packet );
/* Save the signal in a list */
ChildrenSignals.push_back( child_Signal );
ChunkSize += child_Signal->GetSize();
nextSignal ++;
} while ((ChunkSize < MAX_SIGNAL_CHUNK_SIZE) && (nextSignal < packets_in.size()));
/* Sum the signals unpacked so far */
SumSignal->Sum(ChildrenSignals);
}
/* Send the summed signal to the upper level of the network */
packets_out.push_back( SumSignal->Serialize( packets_in[0]->get_StreamId() ) );
break;
}
default:
{
/* Bypass all other messages to the parent node */
for (unsigned int i=0; i<packets_in.size(); i++)
{
packets_out.push_back( packets_in[i] );
}
break;
}
}
}