On Thursday, March 5th, 2026 at 2:13 PM, Roy Fru <[email protected]> wrote: > > > Good Day Mentors, > > I hope this email finds you well. > > I am writing to share my progress on Experiment-0, specifically the OpenMP > section. Here is a summary of my work so far: >
Thanks for the update. > ### 1. Cloning GCC and building libgomp > > - I cloned the GCC source repository and switched to the `devel/omp/gcc-15` > branch. > > - I configured the build to compile only the C and C++ compilers, using the > `--prefix` option to install it in `/home/fureh/gcc-install` to avoid > conflicts with my global GCC installation. > > - To verify the build, I tested a simple program that created and printed > the number of OpenMP threads. The results confirmed the expected behavior > from the thesis: the number of OpenMP threads equals the number of logical > CPUs. > Simply checking the number of OpenMP threads does not verify that your program is using your custom built libgomp. You should also check which libgomp gets linked with your program's binary. > > ### 2. Compiling the OpenMP UA benchmark (NPB v3.4.4, Class A) > > - I downloaded and extracted the NPB v3.4.4 tarball and created a copy of > the configuration file. > > - I initially compiled the `UA` benchmark using the global GCC compiler. > > - I set the number of OpenMP threads via the `OMP_NUM_THREADS` environment > variable and successfully ran the `ua.A.x` binary. > > Nice. > ### 3. Running the benchmark with the custom-built libgomp > > - I modified the `UA` benchmark config file to point to my custom GCC > compiler: > > CC = /home/fureh/gcc-install/bin/gcc > CLINK = /home/fureh/gcc-install/bin/gcc > CFLAGS = -O3 -fopenmp > > - I exported the number of threads using `OMP_NUM_THREADS` and ran the > `ua.A.x` binary. > > - The benchmark successfully executed using my custom-built `libgomp`, > confirming that the setup works with my local GCC installation. > Again, please check that the ua.A.x binary really links your libgomp build. > > I am currently reading through Chapter 4 of the thesis and will provide an > update on the next part of Experiment-0 soon. > I am still working on the final version of the manuscript. So please feel free to point out any obvious typos, errors, etc.. > Kindly let me know if I should include screenshots or output logs in the next > submissions to better illustrate my progress. > Yes please. And please also include all four mentors on your emails. Thanks, Himadri
