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MATLAB CENTER FOR INTEGRATED RESEARCH COMPUTING http://info.circ.rochester.edu/Summer_School_Workshops/Matlab.html Outline Part I – Interacting with Matlab Running Matlab interactively from the command line Submitting batch jobs to Matlab Matlab scripts, functions, paths. Accessing the GUI environment Part II – Speeding up Matlab Computations Using the Code Profiler and the Code Analyzer Symmetric Multi-Processing with Matlab Accelerating Matlab computations with GPUs Running Matlab in distributed memory environments Part III – Mixing Matlab and Fortran/C code Compiling MEX code from C/Fortran Turning Matlab routines into C code Running Matlab interactively from the command line module load matlab srun -t 60 --pty matlab –nodesktop Submitting Batch Jobs sbatch matlab.slurm #!/bin/bash matlab.slurm #SBATCH -t 60 module load matlab matlab -r "example1" example1.m nprimes=0; primes=[]; for i=2:100 if (all(mod(i,primes(1:nprimes)) ~= 0)) nprimes=nprimes+1; primes(nprimes)=i; end end primes Submitting Batch Jobs sbatch matlab2.slurm Can also use 'here files' to pass commands to matlab via standard in #!/bin/bash matlab2.slurm #SBATCH -t 60 module load matlab matlab <<EOF nprimes=0; primes=[]; for i=2:100 if (all(mod(i,primes(1:nprimes)) ~= 0)) nprimes=nprimes+1; primes(nprimes)=i; end end primes EOF Submitting Batch Jobs sbatch matlab3.slurm #!/bin/bash matlab3.slurm #SBATCH -t 60 Or you can put the entire module load matlab program in quotes. matlab -r " \ nprimes=0; \ Use commas to separate lines primes=[]; \ that you want the results from for i=2:100; \ if (all(mod(i,primes(1:nprimes)) ~= 0)); \ We are using the back slash \ as a nprimes=nprimes+1; \ line continuation character for primes(nprimes)=i; \ bash. end; \ end; \ primes \ " Calling Functions or Scripts not in your cwd You can use the addpath command before calling scripts or functions. #!/bin/bash /home/jcarrol5/matlab5.slurm #SBATCH -t 60 module load matlab matlab -r "addpath('/public/jcarrol5/matlab'); example1" Exercise 1 Run the following matlab program on bluehive to approximate the value of pi. (or one of your own programs) N=1e6 x=rand(N,1) y=rand(N,1) pi_approx=sum(x.^2+y.^2 < 1)/N*4.0 Accessing the GUI features To use Matlab's GUI you must connect through suitable environment Both MobaXterm (Windows) and Terminal (Mac/Linux) support X11 forwarding necessary for accessing the Matlab GUI. X2go provides a remote desktop session within the BlueHive custer. Why X2go? Faster than using X11 forwarding (compresses data) Has clients for all major operating systems Saves your session when you are disconnected You don’t have to restart Matlab if your network connection drops. Running interactive jobs with X11 forwarding Before we ran the following to launch an interactive matlab session (without the Matlab GUI) srun -t 60 --pty matlab -nodesktop To use the GUI we have to use the interactive script interactive -t 60 matlab There is also a 'JobLauncher' utility which you can access through the Gnome Menu Bar Using the terminal but with GUI support You can connect with X11 forwarding and still start matlab without a desktop matlab -nodesktop Figure windows will still pop up etc... You can also make plots without a GUI using imagesc(rand(100))); print('-dpdf','-r300','fig1-batch.pdf'); Matlab Code Analyzer and Profiler Matlab has sophisticated tools for analyzing and profiling code. It will often offer suggestions on how to speed up your code.