OpenMP 3.0 for C w POSIX Threads Runtime 0.5

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1. Programming

OpenMP and MPI hybrid thread numbers

hi, I have two basic questions, I will be really grateful if I receive any comment from you, I have an MPI code where I am trying to implement OpenMP directives. The machine where I run the code has 16 cores. I run the code with export OMP_NUM_THREADS=2 mpirun -np 4 ./exec If I...

2. Programming

Undefined reference to omp_get_thread_num using OpenMP?

I am using a large code-base that compiled successfully before using make with a makefile and cmake. However, now that I'm trying to use openmp with it, I'm now getting the errors undefined reference to `omp_get_thread_num' undefined reference to `omp_get_num_threads'I don't think this...

3. Programming

Gcc openmp programming problem

Dear Linux users, I'm a noob at openmp, gcc and c programming. I can run my own openmp code in terminal with no problem, eg. gcc -fopenmp program.c -o program. But now I'm trying to compile and run another person's code, it contains a makefile and multiple .c and .h files. I don't know how to...

4. HP-UX

Spawn more than 8 threads OpenMP & HPUX

Hi folks, I am trying to run more than 8 threads in OpenMP team on my HP-UX 11i v3 system (without root access), but NO success. Compiler: aCC A.06.26 I tried to setup: OMP_NUM_THREADS, omp_set_num_threads(), max_thread_proc=1000, nkthread=8416, set_dynamic=0 Machine has 2 processors...

5. UNIX for Advanced & Expert Users

Linkage of POSIX threads function calls

I wonder if someone knows what is the rationale behind linking function calls of the POSIX threads library at link-time vs. run-time. For example, if I create the following program: #include <pthread.h> void noop() { return; } int main() { pthread_self(); pthread_atfork(noop,...

6. Programming

need help with posix threads

Hi, I am new to posix threads. The no of threads to be created depends on the runtime. If I get the number of threads, I need to forward declare pthread_t mythread; how to do that can I use pointers and use malloc()?? I also have another question. The pthread_join is used to make...

7. UNIX for Advanced & Expert Users

Posix threads

Hi, consider the code below: #include <stdio.h> . . struct myStruct { char *message ; int id; }; . . . void *thread_function( void *ptr ); nt main() { pthread_t thread1, thread2 ,thread3 ; struct myStruct nico1;

8. Programming

POSIX threads and data safety

I created multiple POSIX threads (on readhat Linux) in a C program in my app. What I am doing is - I am creating threads equal to the number of CPUs in the system and and equal number of instances of a certain data structure, basically a queue implementation. I am assigning one ID to the thread...

9. Programming

POSIX threads

Hello ! Let's supose I have a main function in C , and two POSIX threads. I give you an example down : int main() { int something; char else; void *FirstThread(); void *SecondThread(); .. <start those two pthreads ..> return 0;} void *FirstThread() { ... } void *SecondThread()...

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