See the thread here for a recent post about using topas Bragg in RMCProfile.

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Issue with RMCProfile V6.7.9 Linux GPU Request for Assistance
#1
I am writing to inform you about an issue I have encountered with the RMCProfile V6.7.9 Linux GPU that I downloaded from
https://sourceforge.net/projects/rmcprof...z/download. Unfortunately, the program stops functioning and displays an error message at the end of the execution log.
 
Below is a snippet of the execution log:
 
 Use CUDA version
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----------------------------------------------------------------------------
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            RMCProfile version 6.7.9.5
            ==========================
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Version type: Version with molecular constraints and EXAFS
Version date: Aug-22-2023::01
Release notes: Robust XRAY implementation; auto weights adjustment; topas profile for Bragg
Using files: [font=游ゴシック]ABCD[/font]
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----------------------------------------------------------------------------
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 THREADS_numbr =           24
 THREADS_id =            0
 THREADS_id =            5
 THREADS_id =           21
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[font=游ゴシック]…[/font]
 
 Info> Boltzmann temperature is   2.47771265600000    
 
 No atom swap moves will be generated,
 atoms will only be translated.
 
 Since there is no ZMOVESCALE line ZMOVESCALE=1.0
forrtl: severe (174): SIGSEGV, segmentation fault occurred
Image              PC                                   Routine            Line        Source            
rmcprofile         000000000073D743   Unknown               Unknown  Unknown
libc.so.6          00007F1ED3A42520     Unknown               Unknown  Unknown
rmcprofile         00000000005DF8E2   Unknown               Unknown  Unknown
rmcprofile         000000000045E884   Unknown               Unknown  Unknown
rmcprofile         0000000000404FE2    Unknown               Unknown  Unknown
libc.so.6          00007F1ED3A29D90    Unknown               Unknown  Unknown
libc.so.6          00007F1ED3A29E40    __libc_start_main     Unknown  Unknown
rmcprofile         0000000000404EEE   Unknown               Unknown  Unknown
 
 
As you can see, the error message appears at the end of the log. I would greatly appreciate it if you could provide guidance or suggest any potential solutions to resolve this issue.
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Here are some additional details that might be helpful:
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Operating System: Ubuntu 22.04.4 LTS
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Thank you very much for your time and assistance. I look forward to your response.
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Best regards,
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#2
can you share the whole RMC folder so we can help debug? Thank you!
--

Dr. Yuanpeng Zhang
Neutron Scattering Scientist, ORNL
Web: https://www.iris2020.net
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#3
Thank you for your prompt response and willingness to assist.
 
As requested, I have prepared the entire RMC folder for your review. Please find it attached to this email. I hope this will help you in debugging the issue.

Thank you once again for your support.
 
Best regards,


Attached Files
.zip   240819_TiO2_powder_GPU_1.zip (Size: 648.45 KB / Downloads: 5)
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#4
Checking through your files, I think the issue is probably not something to do with the GPU accelerator. It seems that your input data is not sitting on an equally space grid, inferring that you may want to do a rebin of your data first, before feeding into the RMCProfile fitting. Here is detailed instruction about how-to, https://rmcprofile.ornl.gov/data-pre-processing-for-rmcprofile

Also, when you use 'FITTED_SCALE', you may also want to enable 'FITTED_OFFSET'. This may not be an issue but is something good to have.

You may also want to check out the weight optimization in the RMCProfile package manual, https://rmcprofile.ornl.gov/manual/

The 'SAVE_PERIOD' is probably too short. I would set it to something like '10 MINUTES'.

Not sure whether you have ever gone through the tutorials coming with the package already. If not, I would suggest going through them first.
--

Dr. Yuanpeng Zhang
Neutron Scattering Scientist, ORNL
Web: https://www.iris2020.net
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#5
Thank you very much for your detailed feedback and guidance, and for taking the time to thoroughly review my input files. 
 
I have followed your suggestions and made the following changes: 
1. Rebinning of the input data has been performed. 
2. Enabled 'FITTED_OFFSET' alongside 'FITTED_SCALE'. 
3. Adjusted the 'SAVE_PERIOD' to '10 MINUTES'. 
 
However, despite these changes, I am still encountering the same error, and the calculation stops. 
 
I have not yet implemented the weight optimization as I believe it may not be directly related to the issue we are currently facing. 
 
Additionally, I would like to mention that when using the CPU version of RMCProfile (version 6.7.9.4) with the same input files, excluding the GPU options, the simulation runs without any errors. This issue seems to be specific to the GPU version. 

 
For your information, I have gone through the tutorials and the manual, though only briefly, to familiarize myself with the package. 
 
I have attached the current input file and log file (nohup.out) for your review. Could you please provide further guidance on how to resolve this issue? 
 
Thank you once again for your support, assistance, and the valuable time you have spent on reviewing my files.


Attached Files
.zip   240912_TiO2_powder_GPU.zip (Size: 484.45 KB / Downloads: 0)
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