Intel® Fortran Compiler 中的主題 Re: Different results between Debug and Release results

Different results between Debug and Release results

Matteo — Sat, 03 Oct 2020 22:30:57 GMT

I found different results between Debug and Release version of the same program.
I have just read some posts in this topic.
I would like to set my compiler in order to have a NaN for not initialized scalar and array.
In this way, with /fpe:0, I should have an error, avoiding errors in release version.
What shall I set in the compiler?

Re: Different results between Debug and Release results

mecej4 — Sun, 04 Oct 2020 11:11:25 GMT

Matteo,

I am afraid that there is no simple solution. There are many causes for the single symptom that you stated: results changing when compiler options are changed. Not surprisingly, there is no single compiler option to help you to locate and fix the problems in your code.

See the Intel documentation for details regarding the various /check and /warn options.

If you can post the code and show us what kinds of differences you see, someone may be able to make suggestions for a solution.

Re: Different results between Debug and Release results

Matteo — Sun, 04 Oct 2020 17:41:53 GMT

Thank you for your reply.
Unfortunately the code is very large and a non disclosure agreement doesn't let me to share that.
In some thread I found Qinit:snan,arrays could initialize as NaN the variables, but my compiler doesn't recognize this command.
Which is the correct set?

Re: Different results between Debug and Release results

andrew_4619 — Sun, 04 Oct 2020 18:06:41 GMT

https://software.intel.com/content/www/us/en/develop/documentation/fortran-compiler-developer-guide-and-reference/top/compiler-reference/compiler-options/compiler-option-details/data-options/init-qinit.html

Re: Different results between Debug and Release results

Matteo — Sun, 04 Oct 2020 20:32:06 GMT

Thank you.
/Qinit:snan,arrays is the solution?
Why doesn't it work in my compiler?

Re: Different results between Debug and Release results

IanH — Sun, 04 Oct 2020 21:20:15 GMT

What specifically does your compiler say?

Re: Different results between Debug and Release results

Matteo — Mon, 05 Oct 2020 06:21:03 GMT

@IanH ha scritto:

What specifically does your compiler say?

Hi, that's the warning:
1>ifort: command line warning #10006: ignoring unknown option '/Qinit:arrays'

I set that in Project>Command Line

Re: Different results between Debug and Release results

IanH — Mon, 05 Oct 2020 11:04:06 GMT

What compiler version? If it isn't current, check its version specific documentation to make sure it is recent enough to support that option.

Re: Different results between Debug and Release results

andrew_4619 — Mon, 05 Oct 2020 11:22:16 GMT

C:\test>ifort reproducer.f90 /Qinit:arrays /c
Intel(R) Visual Fortran Intel(R) 64 Compiler for applications running on Intel(R) 64, Version 19.1.1.216 Build 20200306
Copyright (C) 1985-2020 Intel Corporation. All rights reserved.

Works fine for me, what version are you using? Maybe post the full command line and output as above.

Re: Different results between Debug and Release results

mecej4 — Mon, 05 Oct 2020 18:23:54 GMT

The /Qinit:arrays option works with Ifort Version 15.0.7.287 and later versions. It does not work with the next older version that I still have, which is 14.0.4.237.

Re: Different results between Debug and Release results

Matteo — Thu, 08 Oct 2020 13:20:11 GMT

Thank for your reply.

Unfortunately I use a 14.0.6 version and I understood it is too old for that setting.
Anyway I solved by an hard debug