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John

Thanks for your detective work. I didn't bother with my test program - I just went straight to the production code. Knocking out ACTION='WRITE' dropped the save time for the test file I've bee ...

OK, lots of testing done. Here's the results:

First test was to replace a write statement inside a loop with a write statement with one more layer of implied-do (as John suggested). No measurable d ...

Result of a quick experiment in Perl:

The code (for those interested in languages with semicolons) is as follows:
# Test speed of writing 4001x4001 array to file

use FileHandle;

$nzrow=4000; ...

John

Useful food for thought there.
By testing on the local HDD and getting 4 mbyte/second; this is a bit slow but not dramatic. I would hope for about 10 mb/sec. This establishes that the program ...

Hi folks

I'm having a performance problem with writing to file on a networked drive. Writing out a biggish (4001x4001) array to file, it's taking over half an hour going to shared storage on a NAS ...