[Octave-bug-tracker] [bug #40562] Consider using PRINTF_EXPONENT_DIGITS on MinGW

[Philip Nienhuis]

Follow-up Comment #1, bug #40562 (project octave):

FYI, run natively on a Win 8 machine at work (3.7.7+ dev versio of Nov 11):

>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.25564 seconds.
>> fclose (fid)
ans = 0
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.28983 seconds.
>> fclose (fid)
ans = 0
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.24964 seconds.
>> fclose (fid)
ans = 0
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.24863 seconds.
>> fclose (fid)
ans = 0
>>
>> setenv ("PRINTF_EXPONENT_DIGITS", "2")
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.42566 seconds.
>> fclose (fid)
ans = 0
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.40966 seconds.
>> fclose (fid)
ans = 0
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.4936 seconds.
>> fclose (fid)
ans = 0
>> x = rand (1e6, 1);
>> fid = fopen ("tst.txt", "wt");
>> tic; fprintf (fid, "%g\n", x); toc
Elapsed time is 4.4866 seconds.
>> fclose (fid)
ans = 0
>>


so this environment setting doesn't seem to make much difference. At first
looks it's indeed about 5 % slower.

After resetting it with
>> setenv ("PRINTF_EXPONENT_DIGITS", "")
the execution times didn't go down to ~4.27 secs as before, however. Octave
needed to restart to get the original times from before this setting.


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