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September 20, 2017, 00:21 |
calculate slowly
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#1 |
Member
liyong
Join Date: Feb 2017
Posts: 66
Rep Power: 9 |
After running several minutes, CPU occupied by the procedures of cvg solver is almost zero(about 50% only in a short time now and then ), while the memory is used almost 98%! And the calculating is so slowly that only 10 cycles is calculated in two hours. I want to know if this is normal ?
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September 20, 2017, 02:36 |
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#2 |
Member
liyong
Join Date: Feb 2017
Posts: 66
Rep Power: 9 |
Image1505889378.720538.jpgImage1505889378.720538.jpg
Sent from my iPad using CFD Online Forum mobile app |
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September 20, 2017, 02:36 |
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#3 |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 265
Rep Power: 10 |
Hi,
if RAM is full, windows writes a page file and uses HDD space as virtual RAM (rough explanation). This of course slows down the simulation, basically stopping it. You need to make sure you dont exceed your RAM limit at any time. |
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September 20, 2017, 02:42 |
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#4 | |
Member
liyong
Join Date: Feb 2017
Posts: 66
Rep Power: 9 |
Quote:
But why CPU is not used at all? Sent from my iPad using CFD Online Forum mobile app |
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September 20, 2017, 03:50 |
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#5 |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 265
Rep Power: 10 |
Because your HDD is limited by writing and reading, CPU canīt calculate further if RAM (virtual RAM on HDD) is working too slow.
Check your HDD usage in task manager -> resource monitor |
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September 20, 2017, 04:57 |
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#6 | |
Member
liyong
Join Date: Feb 2017
Posts: 66
Rep Power: 9 |
Quote:
Thank you very much! Sent from my iPad using CFD Online Forum mobile app |
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