solver error

Jared1986 · April 17, 2014, 05:16

Hello to everyone,
I have error message in solver and I don't what does it mean. Does anybody have experience with this kind off error please?

error.txt

mvoss · April 17, 2014, 08:42

"not enough space"
malloc = memory allocation

Jared1986 · April 17, 2014, 08:59

Yes I thought that could be small space, but I had allocated 80% of my memory space for solver running, so I don't know, why I could see this message :-(

mvoss · April 17, 2014, 09:01

Try to set the memory alloc factor like 1.1. in the solver-settings. Sometimes it helps the solver to get it started.

Jared1986 · April 17, 2014, 09:44

I try to set different catalogue size and real size, but If I change entire allocation factor from 1.0 to 1.1. it increase allocated memmory for each components (real, integer ....) so I think that increase requirement on memory size a lot. I have 37 mil cells case and 80 GB of RAM and I have still troubles with right setting of real stack memmory

Abou ali · April 17, 2014, 13:50

Quote:

Originally Posted by Jared1986

. I have 37 mil cells case and 80 GB of RAM and I have still troubles with right setting of real stack memmory

May be the problem is in the hard disc space!!!!!!

Opaque · April 17, 2014, 16:32

The message you are getting is coming when reading the partitioning file for a parallel run. There is not enough memory available in the system to allocate the space required to read such dataset.

You can use the memory factors (s < 1.0x) to reduce the memory used by the simulation (not the file reader) until the simulation will not be able to run either.

ANSYS CFX solver requires ~ 1GB per 1M hex cells, and about 2GB per 1M cells for a hybrid mesh. Memory for other libraries such as the file reader (or MeTiS partitioner) is not included in such estimate. For parallel runs, you may have to add some overhead per partition ~20%, i.e. 1.2x to the previous estimate.

Have you tried to increase the number of partitions, and consequently reduce the memory required per partition. If increasing the number of partitions does not workaround the problem, you may need to contact ANSYS support directly.

Hope the above helps,

PS. I wonder what your model looks like that require at least 113 domains plus 2578 (perhaps more) CAD surfaces on a single domain.

ghorrocks · April 17, 2014, 22:02

That huge number of surfaces is going to cause problems. If they can be merged into a smaller number that will help a lot. If you need them all then you are going to have to face lots of memory problems as that is an unusually large number of surfaces.

April 17, 2014, 05:16	solver error	#1
Jared1986 New Member Jarda Chlup Join Date: Aug 2013 Posts: 21 Rep Power: 12	Hello to everyone, I have error message in solver and I don't what does it mean. Does anybody have experience with this kind off error please? error.txt

April 17, 2014, 16:32		#7
Opaque Senior Member Join Date: Jun 2009 Posts: 1,800 Rep Power: 32	The message you are getting is coming when reading the partitioning file for a parallel run. There is not enough memory available in the system to allocate the space required to read such dataset. You can use the memory factors (s < 1.0x) to reduce the memory used by the simulation (not the file reader) until the simulation will not be able to run either. ANSYS CFX solver requires ~ 1GB per 1M hex cells, and about 2GB per 1M cells for a hybrid mesh. Memory for other libraries such as the file reader (or MeTiS partitioner) is not included in such estimate. For parallel runs, you may have to add some overhead per partition ~20%, i.e. 1.2x to the previous estimate. Have you tried to increase the number of partitions, and consequently reduce the memory required per partition. If increasing the number of partitions does not workaround the problem, you may need to contact ANSYS support directly. Hope the above helps, PS. I wonder what your model looks like that require at least 113 domains plus 2578 (perhaps more) CAD surfaces on a single domain. Last edited by Opaque; April 17, 2014 at 18:14.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Building OpenFOAM1.7.0 from source	ata	OpenFOAM Installation	46	March 6, 2022 13:21
[blockMesh] blockMesh with double grading.	spwater	OpenFOAM Meshing & Mesh Conversion	92	January 12, 2019 09:00
checking the system setup and Qt version	vivek070176	OpenFOAM Installation	22	June 1, 2010 12:34
[swak4Foam] groovyBC: problems compiling: "flex: not found" and "undefined reference to ..."	sega	OpenFOAM Community Contributions	12	February 17, 2010 09:30
Problem with compile the setParabolicInlet	ivanyao	OpenFOAM Running, Solving & CFD	6	September 5, 2008 20:50

April 17, 2014, 08:42		#2
mvoss Senior Member Matthias Voß Join Date: Mar 2009 Location: Berlin, Germany Posts: 449 Rep Power: 20	"not enough space" malloc = memory allocation

April 17, 2014, 08:59		#3
Jared1986 New Member Jarda Chlup Join Date: Aug 2013 Posts: 21 Rep Power: 12	Yes I thought that could be small space, but I had allocated 80% of my memory space for solver running, so I don't know, why I could see this message :-(

April 17, 2014, 09:01		#4
mvoss Senior Member Matthias Voß Join Date: Mar 2009 Location: Berlin, Germany Posts: 449 Rep Power: 20	Try to set the memory alloc factor like 1.1. in the solver-settings. Sometimes it helps the solver to get it started.

April 17, 2014, 09:44		#5
Jared1986 New Member Jarda Chlup Join Date: Aug 2013 Posts: 21 Rep Power: 12	I try to set different catalogue size and real size, but If I change entire allocation factor from 1.0 to 1.1. it increase allocated memmory for each components (real, integer ....) so I think that increase requirement on memory size a lot. I have 37 mil cells case and 80 GB of RAM and I have still troubles with right setting of real stack memmory

April 17, 2014, 22:02		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,696 Rep Power: 143	That huge number of surfaces is going to cause problems. If they can be merged into a smaller number that will help a lot. If you need them all then you are going to have to face lots of memory problems as that is an unusually large number of surfaces.