Hello Peter, thanks for your answer! An indeed it worked for the simple code. But for the project I wanted to use intel inspector, it does not work. The project is written in c and the code is separated in a large set of sub functions? Can this cause the problem? I compile the program with a make filein following format: ************Makefile PROG =name SRCS = file1.c file2.c OBJS = file1.o file2.o LIBS = -lm /usr/local/lib/libfftw.a /usr/local/lib/librfftw.a CC = gcc -fopenmp CFLAGS = -O0 -g -ILibs FC = f77 FFLAGS = -O F90 = f90 F90FLAGS = -O LDFLAGS = -s all: $(PROG) $(PROG): $(OBJS) $(CC) $(LDFLAGS) -o $@ $(OBJS) $(LIBS) clean: rm -f $(PROG) $(OBJS) *.mod .SUFFIXES: $(SUFFIXES) .f90 .f90.o: $(F90) $(F90FLAGS) -c $ file1.o: file1_incld.h ************EOF What could it be? Yours, Emanuel

Hello Peter, I tried what you supposed but it didn't worked. Now I try to use icc compiler, here i would use following flags: CC = icc -openmp CFLAGS = -O0 -g -ILibs I think maybe the code structure is too complex, as the parallel for loop is in a subsub function? Thanks anyway, I will come back if I have further questions or some solution. Yours, Emanuel

Hello MrAnderson with "the code is separated in a large set of sub functions" I wanted to say that the multi tread loop in a sub function: I try to explain it with a diagram main - function 1 in main - function 2 in function 1 - function 3 in function 2 paralleled loop
I hope it is more clear now. The individual functions are all in separated files. My source files are all in the same directory, where I set the path to. What else could it be? Yours, Emanuel