How to use the disc memory?

Wenjun Zhu
Wenjun Zhu Altair Community Member
edited December 2021 in Community Q&A

image

When I run the solving process, the memory is insufficient.

where to find the option Using disk memory? thanks!

Tagged:

Answers

  • Alexandru-Ionel Constantin
    Alexandru-Ionel Constantin Altair Community Member
    edited December 2021

    Hi Wenjun Zhu,

     

    The option is under Solving>Solving process options>Edit:

    image

    image

     

    If it is not working, I suggest you use an iterative solver, ICCG, which requires much less numerical memory.

     

     

    Best regards,

    Alexandru

  • Wenjun Zhu
    Wenjun Zhu Altair Community Member
    edited December 2021
    Alexandru-Ionel Constantin said:

    Hi Wenjun Zhu,

     

    The option is under Solving>Solving process options>Edit:

    image

    image

     

    If it is not working, I suggest you use an iterative solver, ICCG, which requires much less numerical memory.

     

     

    Best regards,

    Alexandru

    Thanks, Alexandru.  by the way, would ICCG scarifies the accuracy on the results compared to MUMPS?

  • Alexandru-Ionel Constantin
    Alexandru-Ionel Constantin Altair Community Member
    edited December 2021
    Wenjun Zhu said:

    Thanks, Alexandru.  by the way, would ICCG scarifies the accuracy on the results compared to MUMPS?

    You are welcome!

    I can say that the results accuracy is the same, the results differ at 4-6 decimal(from my experience, 8 years on using Flux).

  • Lavanya Vadamodala_20519
    Lavanya Vadamodala_20519
    Altair Employee
    edited December 2021

    Hello Wenjun,

    Were you able to run your model successfully without any memory issues?

    Thank you,

    Lavanya

  • Wenjun Zhu
    Wenjun Zhu Altair Community Member
    edited December 2021
    Lavanya Vadamodala_20519 said:

    Hello Wenjun,

    Were you able to run your model successfully without any memory issues?

    Thank you,

    Lavanya

    Yes, it worked for a high mesh density in my model. However, for a even higher mesh density, the solving process just quit with hints "no management error occurs".

  • Lavanya Vadamodala_20519
    Lavanya Vadamodala_20519
    Altair Employee
    edited December 2021
    Wenjun Zhu said:

    Yes, it worked for a high mesh density in my model. However, for a even higher mesh density, the solving process just quit with hints "no management error occurs".

    Hello Wenjun,

    Have you seen any significant difference in computed quantities, after increasing mesh density?

    Because after some extent, with increase in mesh density, significant difference will not be seen in quantities.

    If you want to run simulation with more higher density, then it is recommended to use more RAM or memory, and Dynamic memory option.

    image

    In Dynamic memory mode, the numerical and character memories are dynamically managed by Flux itself during its execution. So, the user no longer has to configure both memories.

    Thank you

Categories