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Questions - memmap

Why my code runs so much slower with joblib.Parallel() than without?

I am new to use joblib.Parallel() to speed up some massive numpy.fft calculations. I follow this example presented on joblib-web Using the example, I can see following result on my computer: Elapsed t...
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Wu-O

python

parallel-processing

joblib

parallelism-amdahl

memmap

Votes: 0

Answers: 1

Latest Answer

Q :" Can someone help me "why"? " A :Sure, your code has acquired IMMENSE add-on overhead-costs, and it keeps repeating collecting 65536 x ( that many times!!) the :SER / xfer /...
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user3666197

Matlab: fastest method of reading parts/sequences of a large binary file

I want to read parts from a large (ca. 11 GB) binary file. The currently working solution is to load the entire file ( raw_data ) with fread(), then crop out pieces of interest ( data ). Question: Is ...
test-img

user2305193

matlab

memmap

Votes: 0

Answers: 2

Latest Answer

I would do two things to speed up your code: preallocate the data array. write a C MEX-file to call fread and fseek. This is a quick test I did to compare using fread and fseek from MATLAB or C: %% ...
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Cris Luengo

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