Dear ROOTers,
I am experiencing some odd problems with TMapFile. I took the simple
example hprod.C and hcons.C from tutorial and modified both into compiled
programs. Then somehow the consumer did not work correctly. (The
program didn't crashes. But it looked like the consumer histogram was
always be empty ...) BTW the same consumer code worked perfectly OK in
CINT. I am using RH9.0 with gcc3.2 compiler, and a home-compiled ROOT
3.04/02. I have tried to use SetMapAddress() to get the prefered the share
memory address and linked both of the code with libNew. Below are my codes
and a Makefile. Could someone let me know what might be the cause?
Many thanks!
#################################### Producer: hprod.C
#include <TROOT.h>
#include <TPad.h>
#include <TMapFile.h>
#include <TH1.h>
#include <TH2.h>
#include <TProfile.h>
#include <TSystem.h>
#include <TCanvas.h>
#include <iostream>
#include <TRandom.h>
using namespace std;
int main()
{
TMapFile::SetMapAddress(0x4125c000);
TMapFile* mfile = TMapFile::Create("hsimple.map","RECREATE", 100000,
"Demo memory mapped file with histograms");
TH1F* hpx = new TH1F("hpx","This is the px distribution",100,-4,4);
hpx->SetFillColor(48);
mfile->Print();
Float_t px, py, pz;
int ii = 0;
while (1) {
gRandom->Rannor(px,py);
hpx->Fill(px);
if (!(ii % 10)) {
mfile->Update(); // updates all objects in shared memory
if (!ii) mfile->ls(); // print contents of mapped file after
} // first update
ii++;
gSystem->Sleep(100);
}
}
######################## Consumer hcons_test.C
#include <TROOT.h>
#include <TPad.h>
#include <TMapFile.h>
#include <TH1.h>
#include <TH2.h>
#include <TProfile.h>
#include <TSystem.h>
#include <TCanvas.h>
#include <iostream>
using namespace std;
int main()
{
TMapFile* mfile = 0;
mfile = TMapFile::Create("hsimple.map");
mfile->Print();
mfile->ls();
TH1F *hpx = 0;
// Loop displaying the histograms. Once the producer stops this
// script will break out of the loop.
Double_t oldentries = 0;
while (1) {
hpx = (TH1F *) mfile->Get("hpx", hpx);
if (hpx->GetEntries() == oldentries) {
gSystem->Sleep(1000);
continue;
}
oldentries = hpx->GetEntries();
printf("Entries, hpx=%d, Mean=%g, RMS=%g\n",hpx->GetEntries(),hpx->GetMean(),hpx->GetRMS());
gSystem->Sleep(1000);
if (gSystem->ProcessEvents())
break;
}
}
############################# Makefile
ROOTCFLAGS = $(shell root-config --cflags)
ROOTLIBS = $(shell root-config --libs) -lNew
ROOTGLIBS = $(shell root-config --glibs)
CXXFLAGS = -O2 -fPIC -I$(ROOTSYS)/include -DCOMPILED_ROOT
CC = gcc
OPTIM= -O2 -fexpensive-optimizations -funroll-loops
CXXFLAGS +=$(ROOTCFLAGS)
LIBS = $(LIBM) $(ROOTLIBS) $(ROOTGLIBS)
hprod: hprod.o
$(CC) $(CXXFLAGS) -o hprod hprod.o $(LIBS)
hcons_test: hcons_test.o
$(CC) $(CXXFLAGS) -o hcons_test hcons_test.o $(LIBS)
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:15 MET