Optimization is really slow
Hi,
I'm having problems with the topology optimization of one brake pedal that I'm trying to optimize. It seems to be all ok with the model, but when I try to run Optistruct the process is really slow, like 30 minutes per interation and my model is relatively simple. I have no idea of what could be causing the problem here, because I did an analysis to see if it was all ok and it seemed to be all fine.
I'll have atached my model so you can try to help me and find what is my problem here.
Thanks
Answers
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Hi Pedro Neves,
I think it might be because of your system configuration. We are able to run it quickly at our end.
Please can you tell us which version of Solver you are using and configurations of your system
Thank you
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Sorry @Premanand Suryavanshi I didn't received the notification of your reply and I only went to see my posts now.
I am using the version of solvers 2018.0.1 (hotfix). In the beggining of my optimization, in Optistruct, the values of progress and iteration progress seem to be always struck in 2% and 62%, correspondingly. Ãfter a while, the optimization advances to the next iteration. And then, if I open the results in the end, they are very poor and show almost or completely nothing.
What do you mean with configurations of my system?
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@Premanand Suryavanshi can you answer my post please?
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How about your hardware? CPU? Mem? Do you run in parallel?
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In my laptop it took less than two minutes.Please share above requested details.
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My laptop it's an Asus ROG GL552VW, I think it has good hardware. i7 6700HQ Processor, SDRAM 8Gb.
What happened was weird, because in my first times it went well, but after some weeks of using the version I have now happened what I described in my later post
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Please check attached documents for platform support and hardware recommendation.
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Hello Pedro Neves,
I got the same problem as you.
For me, this issue comes from the location of the model files. I placed model files in GOOGLE DRIVE, thus it takes me 6 hours to complete the one simple optimization.
Luckily, then I move model files to Download or Desktop, and it will run as normal.
I hope it will help you or others in the future.
Best,
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Sy Nguyen Van said:
Hello Pedro Neves,
I got the same problem as you.
For me, this issue comes from the location of the model files. I placed model files in GOOGLE DRIVE, thus it takes me 6 hours to complete the one simple optimization.
Luckily, then I move model files to Download or Desktop, and it will run as normal.
I hope it will help you or others in the future.
Best,
using a network or cloud drive is not recommended, as the solver needs to write and read data from your model location (scratch).
But for OptiStruct, 2 aspects are important:
- model size vs RAM memory available (need to take into account the memory used by other applications and windows, for example) >> if RAM is not enough, the modelwill use less RAM, BUT try to use more hard disk
- scratch data is written and read for temporary data, and specially if not enough RAM memory is available, it will be necessary much more space for scratch in the hard disk. Problem is, if the scratch access is slow (slow hard drive, or network drive), your run will take longer.
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Altair Employee