Why the external dos command/program is so slow in 64 bit window?
6 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi,
I try executing some external commands/programs in Matlab (R2010a, 64bit) but they are very slow. Here is an example: Matlab program: disp('Test external command in Matlab');
for i = 1:5 tic system('cd .'); toc end
Results: Test external command in Matlab Elapsed time is 7.136996 seconds. Elapsed time is 6.094630 seconds. Elapsed time is 5.574957 seconds. Elapsed time is 6.235473 seconds. Elapsed time is 5.973438 seconds.
My computer is Dell Optiplex 980, Windows 7. I have not met the same problem in Linux or 32bit Matlab.
0 commentaires
Réponses (4)
the cyclist
le 22 Fév 2011
I am using R2010b on a 64-bit Mac, and I do not see that behavior. My elapsed times are on the order of milliseconds.
0 commentaires
Aviv Rosenberg
le 31 Oct 2016
Modifié(e) : Walter Roberson
le 31 Oct 2016
Try this:
Haven't tested on windows, but it really speeds up my workflow on OSX.
1 commentaire
Walter Roberson
le 31 Oct 2016
I notice that the source does
pb.redirectErrorStream(true);
I am wondering if that affects explicit I/O redirection the user may have given on the command line, such as if the command were
someCommand SomeArguments 2>SomeOutputFile
because the user wanted stderr to go to a file?
Xiangrui Li
le 3 Mai 2017
I observed the slowness for both win32 and win64. I just posted a question why redirecting the output to a file improve the performance. It is strange that, even if there is no output, redirecting still makes it faster.
tic, for i = 1:5, system('cd .'); end; toc
Elapsed time is 0.627796 seconds.
tic, for i = 1:5, system('cd . >myFile'); end; toc
Elapsed time is 0.111956 seconds.
0 commentaires
Voir également
Catégories
En savoir plus sur Web Services dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!