MATLAB: Is MATLAB 7.3 (R2006) only able to use 25% of the CPU

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When I run a lengthy MATLAB task and press CTRL+ALT+Delete to bring up the Windows Task Manager, the Task Manager shows me that MATLAB is only using 25% of CPU. I expect MATLAB to use all 100% of CPU.

Best Answer

Prior to MATLAB 7.4 (R2007a) MATLAB was a single threaded application. So on a hyperthreaded dual processor machine which runs 4 threads, two per CPU, MATLAB will take only 25% of CPU time corresponding to 1 thread.

Related Solutions

MATLAB: How to find the middle 25% of an array

Try this

X = length(yourVector)
index1 = round(vecLength * (0.5 - 0.25/2))
index2 = round(vecLength * (0.5 + 0.25/2))
Y = X(index1 : index2)

MATLAB: Isn’t MATLAB using the full CPU

In general, MATLAB is single threaded except for some lower level BLAS routines that are multithreaded. Therefore, CPU utilization may vary depending on what function you are running.

If you have a license for the Parallel Computing Toolbox, and your problem is parallelizable, you can use more of the CPU’s resources by spawning a pool of workers.

If you cannot use the Parallel Computing Toolbox, there are other ways that you can speed up your code. MATLAB has a profiler to determine where a program is spending time. For more information on using the profiler, please refer to this documentation link:

https://www.mathworks.com/help/matlab/matlab_prog/profiling-for-improving-performance.html

There are other ways to improve performance, such as preallocation of variables and vectorization. Additionally, if there are other CPU intensive applications running in the background, this could restrict the CPU utilization for MATLAB. Please refer to the following documentation link for more details on these suggestions, and other techniques:

https://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html

Best Answer

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MATLAB: How to find the middle 25% of an array

MATLAB: Isn’t MATLAB using the full CPU

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