How to enable the GPU to run a FORTRAN program?

[eliopoulos]

How can I enable the GPU to run a parallel do loop in a FORTRAN program? I have tried: "!$omp target teams distribute parallel do" but the GPU does not run. Any advice?

[eliopoulos]

When I run the program from the Visual Studio is the same.

[Barbara_P_Intel]

>>  Only Intel GPU are compatible with FORTRAN?

Yes. Intel Fortran only works with Intel GPU.

[eliopoulos]

Can I do anything about the environment issue?

[Barbara_P_Intel]

What does your PATH variable look like? Perhaps the wrong directory is being picked up by ifx.

[eliopoulos]

How can I see that?

[eliopoulos]

I don't know if this is what you want but I have:

Executables: $(VSInstallDir)VC\Tools\MSVC\$(VCToolsVersion)\bin\HostX64\x64;$(UniversalCRTSdkDir)bin\$(UCRTVersion)\x64;$(UniversalCRTSdkDir)bin\x64;$(IFortInstallDir)bin;$(IFortInstallDir)bin;$(VSInstallDir)Common7\ide;$(VSInstallDir)Common7\Tools;$(FrameworkDir)$(FrameworkVersion);$(WindowsSdkDir)bin\x64;$(PATH)

Includes: $(UniversalCRTSdkDir)Include\$(UCRTVersion)\um;$(UniversalCRTSdkDir)Include\$(UCRTVersion)\shared;$(IFortInstallDir)opt\compiler\include;$(MKLInstallDir)..\latest\include;$(VSInstallDir)VC\Tools\MSVC\$(VCToolsVersion)\atlmfc\include;$(WindowsSdkDir)include\um;$(WindowsSdkDir)include\shared;$(FrameworkSDKDir)include

Libraries: $(VSInstallDir)VC\Tools\MSVC\$(VCToolsVersion)\lib\x64;$(UniversalCRTSdkDir)Lib\$(UCRTVersion)\um\x64;$(UniversalCRTSdkDir)Lib\$(UCRTVersion)\ucrt\x64;$(IFortInstallDir)lib;$(MKLInstallDir)..\latest\lib;$(VSInstallDir)VC\Tools\MSVC\$(VCToolsVersion)\atlmfc\lib\x64;$(WindowsSdkDir)lib\winv6.3\um\x64

Default options: /Qlocation,link,"$(VSInstallDir)VC\Tools\MSVC\$(VCToolsVersion)\bin\HostX64\x64"

[Steve_Lionel]

To see what PATH is from a command window, type:

set path > path.txt

and then attach path.txt to a reply here. Note that the path in a Fortran command prompt window (started with the Intel shortcut) is different from the system PATH which is what will be used if you double-click on an EXE, so check PATH from a bare command prompt (Click Start, type "cmd" (no quotes) and then open Command Prompt when it appears.) The Visual Studio environment is different still.

[eliopoulos]

Because I didn't understand which one is needed, I am providing both paths, From Fortran cmd (path1) and from cmd (path2).

[Barbara_P_Intel]

It looks like path1.txt is the PATH from the oneAPI command window. That's the command window you want to use. The PATH is like what is on my laptop. I asked to be sure some other directories were not before the ones for oneAPI components.

What version of VS is installed?

Please post a reproducer.

[eliopoulos]

Visual Studio 2022 Enterprise is installed. I didn't understand the reproducer thing. What exactly should I do?

[Barbara_P_Intel]

Can you please be more specific about the version of VS 2022 you are using? To get that, start VS, open a solution, click Help in the top bar, click about Microsoft Visual Studio. In the upper left corner there's a version number. It may be something like Version 17.8.1.

A reproducer is a small sample program that demonstrates the issue.

[eliopoulos]

The VS 2022 version is 17.8.6. I haven't got a suitable reproducer. When I run the reproducer I have, I get different errors.

[eliopoulos]

An update:

when I build the solution, I get:

Rebuild started at 17:18...
1>------ Rebuild All started: Project: BSFADAS_03 (IFX), Configuration: Release x64 ------
Deleting intermediate files and output files for project 'BSFADAS_03', configuration 'Release|x64'.
Compiling with Intel® Fortran Compiler 2024.0.2 [Intel(R) 64]...
BSFADAS_03.for
ifx: warning #10148: option '/size-llp64' not supported
ifx: warning #10148: option '/size-llp64' not supported
Linking...
Intel(R) Fortran Compiler for applications running on Intel(R) 64, Version 2024.0.2 Build 20231213
Copyright (C) 1985-2023 Intel Corporation. All rights reserved.
12744354.o : warning LNK4078: multiple '__CLANG_OFFLOAD_BUNDLE__openmp-s' sections found with different attributes (40500040)
Embedding manifest...

Build log written to "file://C:/Work/Work/2023%20OPENZDM/Fortran%20folder/BSFADAS_03/x64/Release/BuildLog.htm"
BSFADAS_03 - 0 error(s), 3 warning(s)
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
========== Rebuild completed at 17:18 and took 31.941 seconds ==========

and when I run the program:

LEVEL_ZERO message: Error: module creation failed
LEVEL_ZERO message: Target build log:
LEVEL_ZERO message: <empty>
Libomptarget error: Unable to generate entries table for device id 0.
Libomptarget error: Failed to init globals on device 0
Libomptarget error: Run with
Libomptarget error: LIBOMPTARGET_DEBUG=1 to display basic debug information.
Libomptarget error: LIBOMPTARGET_DEBUG=2 to display calls to the compute runtime.
Libomptarget error: LIBOMPTARGET_INFO=4 to dump host-target pointer mappings.
Libomptarget error: Source location information not present. Compile with -g or -gline-tables-only.
Libomptarget fatal error 1: failure of target construct while offloading is mandatory

[Barbara_P_Intel]

@eliopoulos, earlier you wrote that you couldn't run the samples I pointed you to successfully. Can you please attach one that fails? Then I can be sure what you are running and work with that.

[eliopoulos]

This sample fails for a large number n but works for smaller values.

[Barbara_P_Intel]

Thanks for the file. 

I ran into the same issue on my laptop... not enough memory in the Intel(R) Iris(R) Xe Graphics GPU for the larger arrays.

So your software environment seems fine then. Good!

'/size-llp64' is not an ifx compiler option. Can you attach the BuildLog.htm? Where did you get that compiler option?

[eliopoulos]

I am not allowed to attach the file. Here it is:

Build Log

Build started: Project: BSFADAS_03, Configuration: Release|x64

Output

Deleting intermediate files and output files for project 'BSFADAS_03', configuration 'Release|x64'. Compiling with Intel® Fortran Compiler 2024.0.2 [Intel(R) 64]... ifx /nologo /O2 /Qopenmp-targets:spir64 /Qopenmp /Qiopenmp /module:"x64\Release\\" /object:"x64\Release\\" /Fd"x64\Release\vc170.pdb" /libs:dll /threads /c /Qmkl /integer-size:64 /Qlocation,link,"C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.38.33130\bin\HostX64\x64" /Qm64 "C:\Work\Work\2023 OPENZDM\Fortran folder\BSFADAS_03\BSFADAS_03.for" ifx: warning #10148: option '/size-llp64' not supported ifx: warning #10148: option '/size-llp64' not supported Linking... Link /Qiopenmp /Qopenmp-targets:spir64 /Fe"x64\Release\BSFADAS_03.exe" "x64\Release\BSFADAS_03.obj" /link /INCREMENTAL:NO /NOLOGO /NODEFAULTLIB:"libcmt.lib" /MANIFEST /MANIFESTFILE:"x64\Release\BSFADAS_03.exe.intermediate.manifest" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /SUBSYSTEM:CONSOLE /IMPLIB:"C:\Work\Work\2023 OPENZDM\Fortran folder\BSFADAS_03\x64\Release\BSFADAS_03.lib" Intel(R) Fortran Compiler for applications running on Intel(R) 64, Version 2024.0.2 Build 20231213 Copyright (C) 1985-2023 Intel Corporation. All rights reserved. 7764354.o : warning LNK4078: multiple '__CLANG_OFFLOAD_BUNDLE__openmp-s' sections found with different attributes (40500040) Embedding manifest... mt.exe /nologo /outputresource:"C:\Work\Work\2023 OPENZDM\Fortran folder\BSFADAS_03\x64\Release\BSFADAS_03.exe;#1" /manifest "x64\Release\BSFADAS_03.exe.intermediate.manifest" BSFADAS_03 - 0 error(s), 3 warning(s)

I don't know where I got that option.

[joshbuttler1]

I think your problem has been solved?  Right?

[eliopoulos]

No, it has not been solved yet, I think.

[Barbara_P_Intel]

Thank you. You only need one of these: /Qopenmp /Qiopenmp. I recommend using /Qiopenmp.

[eliopoulos]

Ok, but nothing changed.