Databases
StackOverflow2013
Postsdbo
POParallel code is taking longer time than sequential code using Parallel computing toolbox in MATLAB. Why?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POParallel code is taking longer time than sequential code using Parallel computing toolbox in MATLAB. Why?
    primarykey
    data
    text
    <p>I am working with MATLAB. I am just new with parallel computing toolbox in MATLAB. I have core i3 processor, MATLAB R2011a, 2 GB of RAM, 320 Hard disk.</p> <p>To calculate speed up, I just wrote following code and found that parallel code is taking longer time than a sequential code.</p> <p>1st code is taking <strong>0.039763 seconds</strong> </p> <p>2nd code is taking <strong>0.379056 seconds</strong>.</p> <hr> <p>1st code: </p> <pre><code>tic MM = magic(5); MN = magic(5); ML = magic(5); MP = magic(5); MK = magic(5); MM MN ML MP MK toc </code></pre> <p>2nd Code: </p> <pre><code>matlabpool open local 4 tic spmd % Uses all 3 workers MM = magic(5); % MM is a variable on each lab end MM{1} MM{2} MM{3} MM{4} toc matlabpool close </code></pre> <p>I want to learn parallel computing toolbox.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAndrew Janke
    1. USSanjay Saxena
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTDuplicate
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POParallel code is taking longer time than sequential code using Parallel computing toolbox in MATLAB. Why?
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COTry it with a bigger problem. Perhaps the overhead of parallelization is more costly than the speedup for a problem of such a small scale?
      singulars
      1. POParallel code is taking longer time than sequential code using Parallel computing toolbox in MATLAB. Why?
      1. USDan
    2. COAdditionally, try to use different operations for workers. Matlab can speedup calculations for several identical sequential operations.
      singulars
      1. POParallel code is taking longer time than sequential code using Parallel computing toolbox in MATLAB. Why?
      1. USDanil Asotsky
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload