OpenMP and more C++
The leap-frog integrator has been implemented and it yields exactly the same behavior as discussed in the GADGET-2 paper; It's more reliable than second order Runge-Kutta even though they are both second order methods. I've modified the code so that it initializes particles according to a simple distribution function. The images below are IFrIT plots of 3, 10, and 100 randomly oriented orbits in a simple 
potential, as well as a plot of 25,000 initial positions.
The main focus of the last few days has been C++ programming and building the individual pieces that will be needed for the N-body code later this month. I've been able to use OpenMP to parallelize the main for-loop. It's surprisingly easy. There is noticeable speed increase on my dual processor system ( Note: I have not yet benchmarked the program to measure the actual speed-up factor). The CPU utilization now reaches 100% rather than the previous 50%. I'm currently working out the bugs with the shared memory system. Writing a code for parallel execution requires me to modify my way of thinking a bit. I am also trying to figure out how to handle large amounts of memory in C++. Once these issues are resolved, I will try to implement a data visualization library so the program can plot output automatically. This will be important for the next project because I want to be able to make animations of the N-body simulations.
In terms of reading, I just started reading Bruno's paper dealing with continuous stellar mass-loss in N-body models.
August 10th, 2009 at 10:30 pm
[...] I spent most of today doing research. I leaned a good bit and got some things accomplished toward my summer research goals. The details of what I did today, including pictures, are here: www.idius.net/openmp-and-more-c/ [...]
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