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change the directory of temporary file

December 19, 2010, 11:13 am
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Hi,

have you guys noticed that as comsol is solving ,there will be a lot of temporary files showing in the directory

~/.comsol/v41/configuration/comsol/org.eclipse.osgi/bundles/.

is there a way to change the location of this directory to someplace else ?

i tried the startup argument of comsol like '-tmpdir and '-prefsdir, it seems that they don't help.
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Issue with Comsol on clusters

September 27, 2012, 1:01 pm
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Hi,

I'm trying to run COMSOL on our cluster and I run the command "comsol -nn 1". What I get is the following message


grep: /usr/local/comsol43/bin/glnxa64/comsolcluster.ini: No such file or directory
grep: /usr/local/comsol43/bin/glnxa64/comsolcluster.ini: No such file or directory
/usr/local/comsol43/bin/comsol: line 1146: /usr/local/comsol43/ext/impi/glnxa64/bin/mpiexec.hydra: No such file or directory

Do you know what to do to fix this issue?

Thanks,

J
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I need help in submitting a job to HPC

September 29, 2012, 11:50 am
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Actually, I am new user. However, I would to like to submit a job to HPC by using cluster computing but it unfortunately give me an error. I have attached of the images of those error.

Khalied
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No speedup when using distributed memory cluster

May 23, 2012, 4:54 am
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I wanted to see if someone could help me determine why I am not seeing any speedup when I submit jobs on multiple nodes of my HPC cluster (using the distributed memory capability).

I understand that speedup is highly model dependent. Per the suggestions of previous discussion threads, I have tried numerous different models with different physics (both linear and non-linear problems). Also, I have tried large memory models and small memory models (also per previous thread recommendations). Below are my results using the COMSOL Model Library Example "Micromixer Cluster Version":

Micromixer_cluster.mph (mesh as given):
1 node; 1 proc.: Run time = 123 sec
1 node; 12 proc.: Run time = 38 sec
4 nodes; 12 ppn: Run time = 99 sec
8 nodes; 12 ppn: Run time = 223 sec

I see speedup when I go from 1 proc. to 12 proc. running on 1 node (shared memory), but I don't see speedup, in fact I see slowdown, when I try to distribute the job across multiple nodes (distributed memory). The step-by-step instructions said to try refining the mesh for better speedup (this was also COMSOL support's recommendation). Here are the results for 2 different refined meshes:

Micromixer_cluster.mph (refined mesh):
1 node; 1 proc.: Run time = 566 sec
1 node; 12 proc.: Run time = 130 sec
4 nodes; 12 ppn: Run time = 259 sec
8 nodes; 12 ppn: Run time = 501 sec

Micromixer_cluster.mph (super-refined mesh):
1 node; 1 proc.: Run time = 1169 sec
1 node; 12 proc.: Run time = 414 sec
4 nodes; 12 ppn: Run time = 614 sec
8 nodes; 12 ppn: Run time = 896 sec

Still no speedup. Only slowdown.

Has anyone seen any speedup on this COMSOL Model Library example? If so, I'd be interested in your results.

One thing that I am doing that is different than the COMSOL recommendation is submitting jobs through the command line rather than through the Desktop. Does anyone know why COMSOL recommends submitting batch cluster jobs through the Desktop and not through the command line? Could this be my issue?

Any help would be appreciated.
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update from 4.2a to 4.3

September 30, 2012, 9:20 am
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Hi,

I have a question, can I update my COMSOL version from 4.2a to 4.3? I tried to install the 4.3 directly, but the license file (for 4.2a) does not work, I also tried the update for 4.3 but it seems only works when you are already 4.3.
thank you.
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COMSOL Releases COMSOL Multiphysics version 4.3a

October 3, 2012, 5:34 am
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We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community

See: http://www.comsol.com/products/4.3a/

This introduces:
* LiveLink™ for Excel®
* LiveLink™ for Solid Edge®
* The ECAD Import Module
* The Fatigue Module

Other major features include:
* Cloud computing support on Amazon's EC2™
* Faster parallel processing
* Improved parametric optimization

To read the press release got to: http://www.comsol.com/press/news/article/895/

Enjoy!

Phil
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SSH Tunnelling and Comsol Server slowdown

October 16, 2012, 1:41 am
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I am using Comsol 4.3 using a tunnel to access my institution's licence server. It works well for regular operations (opening comsol on my PC, starting a job etc).

However, I am not able to start a connection with comsol server. I am actually forwarding the port 2036 remotely to localhost. I start 'comsol server' on the remote workstation. Then I try to connect on my PC to my local port (forwarded via SSH). When I look at the remote workstation I see a notice saying that I connected to the server (Good). But then, my local computer does not respond anymore.

It seems to me that he tries to send the model to the server, but that it fails somehow. Do you know if I need to forward additional port (not only the one for the licence and the 2036 for comsol server support) ?
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Cluster computing stuck at:external progress scheduling

October 17, 2012, 3:43 am
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Hi,Ihave recently setup a cluster and i had comsol 4.3 on the head node,and i had the installation forder shared,
model working directory shared.
However,when I am trying to submit a batch job,using the cluster model in the user guide libarary,it happened to be stuck during "external progress :scheduling"(I found it in the .mph.log file).
And situation is,if I select only one node,the head node,comsolclusterbatch.exe progresses perfect and responded correctly.I select the second node,the compute node,the comsolclusterbatch.exe is effective again and returned the result correctly.
And if I set the node=2 both into working,a job requiring two nodes submitted to the HPC job manager,on both two computer nodes the comsolclusterbatch.exe appeared,comsuming some of memory,ca 60M,but neither of them is comsuming any CPU,and the progress is 0.
I found the log stuck at "external progress 1 :scheduling"
It's very strange that comsol failed to work parallely on two nodes.
I am running windows HPC 2008 R2 on the head node and the compute node.
The headnode have an i7 CPU,and the compute node have a AMD B28 cpu. Both the memory is 16G.

looking forword to your reply
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Cluster computing got stuck :external progress scheduling

October 17, 2012, 3:49 am
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Hi,Ihave recently setup a cluster and i had comsol 4.3 on the head node,and i had the installation forder shared,
model working directory shared.
However,when I am trying to submit a batch job,using the cluster model in the user guide libarary,it happened to be stuck during "external progress :scheduling"(I found it in the .mph.log file).
And situation is,if I select only one node,the head node,comsolclusterbatch.exe progresses perfect and responded correctly.I select the second node,the compute node,the comsolclusterbatch.exe is effective again and returned the result correctly.
And if I set the node=2 both into working,a job requiring two nodes submitted to the HPC job manager,on both two computer nodes the comsolclusterbatch.exe appeared,comsuming some of memory,ca 60M,but neither of them is comsuming any CPU,and the progress is 0.
I found the log stuck at "external progress 1 :scheduling"
It's very strange that comsol failed to work parallely on two nodes.
I am running windows HPC 2008 R2 on the head node and the compute node.
The headnode have an i7 CPU,and the compute node have a AMD B28 cpu. Both the memory is 16G.

looking forword to your reply
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COMSOL 4.3a Installation Problem

October 25, 2012, 7:19 am
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After installing 4.3a, whenever I open most files (or try to at least), I get the following error in a pop-up window:
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4.3a not starting in Win7 64bit

October 30, 2012, 11:50 pm
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I have a problem with the Comsol Multiphysics 4.3a.

I double-click the icon on the desktop, and the startup screen pops up. But after a few seconds, it closes down and nothing more happens.
I have run a memory scan with no problems showing. it is a clean install.

I run a laptop with windows 7 64bit with a intel iCore i3 processor and 4 GB ram. (Toshiba Satellite C660-220).
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installation of 3.5a on max os x 10.8

November 5, 2012, 12:41 pm
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Hi, did you receive an answer to your problem? I have the same one...
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Mac clusters

November 21, 2012, 6:17 am
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Does COMSOL operate on Mac clusters?
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License error: -38

December 19, 2012, 4:38 am
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Hello,

Whenever I try to run COMSOL 4.3, I get this error :

License error: -38
User/host on EXCLUDE list for product
User/host on EXCLUDE list for feature
Feature: CADIMPORT
license path: C;\Program Files\COMSOL43/licens/license.dat:
FLEXnet Licensing error:-38,147

Does anyone have an idea what i should do?

Thank you in advance for your help.
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benchmark papers

January 7, 2013, 5:17 am
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Hi James,

it seems that you have quite some experience with hardware benchmarks for COMSOL. I am currently trying to get some figures about how to size hardware correcly for the use of COMSOL with questions like:
+ how good does COMSOL scale with additional cores or additional CPU speed (Ghz)?
+ is there a method to estimate memory usage for intended simulations/calculations?
+ which application parts do scale with the CPU power and which not (e.g. meshing and solving as different tasks - in other applications meshing is often single threaded) ?

Could you provide me the paper from the conference as stated...
"See my paper on the conference CD for some benchmarking of COMSOL v4-beta2 using DPP. I am still benchmarking with v4.1, but I can say it is at least as good as v4-beta2. Still limited to MUMPS, but it does work"

Thanks and regards
Carsten
(carsten.buchholz@philips.com)
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Parallel progamming using COMSOL 4.2a

January 16, 2013, 8:46 am
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Is it possible to install a license in a cluster? I've already have a Floating Network License (FNL) from 4.2a version installed in a computer that runs in Windows. Could I install the same license on the cluster that runs in Linux, or I would have to purchase a new license?

Thank you
Best regards
Otavio
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renew COMSOL license using a passcode

January 24, 2013, 4:21 pm
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I downloaded the COMSOL 4.3a compact DVD image, double clicked it, then a "COMSOL 4.3a INSTALLER" interface showed.

When I clicked the "Change license" button, a window pop out that says "specify an existing COMSOL 4.3a folder". I used the default "C:\Program Files\COMSOL\COMSOL43a" and click open button. Then a massege that says "invalid destination folder. Wrong version of existing COMSOL 4.3a folder" showed up.

What's that means and how can I solve this problem? Thank you very much!
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Comsol on HPC server

February 22, 2011, 5:13 am
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I have just set up Comsol on a 48 processor machine using HPC server it is one machine with no cluster. It is running extremely slow. When using all 48 processors it takes over 137 seconds to process the wrench simulation model that comes in the model library. When I limit the processors to 2 it process in about 24 seconds which is faster but still slower than it should be. I think it must be something with the configuration settings of either Comsol or HPC server or both? Can anyone help me with the configuration of Comsol and HPC server? Thanks.
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Licensed number of users already reached

February 5, 2013, 4:13 am
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Hello,

I couldn't open the versions 4.2a and 4.3 from COMSOL. A message informing me that the number of users already reached and the program closed automatically. It seems strange for me, because anyone was running it in that moment. I've purchased the licenses from both versions last year. I looked for an answer in COMSOL web site, but unsuccessfully. They said that my subscription has already expired since September 1, 2012.

Does anyone know how to solve this problem?

Thank you very much.

Best regards.
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comsol 4.3 java heap size

February 14, 2013, 8:19 am
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After looking around the forum, I found out that in order to increase the heap size, I have to edit the comsol.ini or comsolserver.ini file.

The problem I am having is, even though I have administrative rights of the computer where the comsol is installed, I cannot edit the file. This means, when I edit it and want to save the file, it says access denied.

Did anyone else have similar problem? Please let me know if you know why it is happening or how I could edit it.

thanks,
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