Hi Stanisław, Thanks for your reply. I am testing for 2D channel flow, with "VelocityCorrectionScheme" and "ModifiedArnoldi". Maybe problem size is small. With regards Abhishek On Tue, Oct 23, 2018 at 5:33 PM Stanisław Gepner <sgepner@meil.pw.edu.pl> wrote:

Hi Abhishek, Are you doing the 2D channel, or the 2.5D case? Could it be that the size of the problem is such that using 8 cores results in very little problem per core - so kind of does not help?

Also, when in parallel you can not use the Arpack driver, only the ModifiedArnoldi will work. Finally, in my experience, using: <I PROPERTY="SolverType" VALUE="VelocityCorrectionScheme"/> works better in parallel than: <I PROPERTY="SolverType" VALUE="CoupledLinearisedNS"/>

Hope this helps in some way, Best, Stan

On 10/23/2018 05:56 PM, Abhishek Kumar wrote:

Hi,

I am trying to test the linear stability solver in parallel. I did a simple test with the channel flow with a single processor and on 8 processors. I observed the following:

Time taken per 1000 steps for single processor = 2.76512s Time taken per 1000 steps for 8 processors = 24.7811s

I expected a reduction in the computational time while running parallel. Is there any issue in the parallel implementation of the linear stability solver? Is something related with the eigenvalue solver?

I would be highly thankful for the comments on this issue.

With regards Abhishek Kumar

--------------------------------------------------------------------------------------- Abhishek Kumar Research Associate Applied Mathematics Research Centre Coventry University, Coventry CV1 5FB The United Kingdom

Email # ac7600@coventry.ac.uk, abhishek.kir@gmail.com

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-- With regards Abhishek Kumar --------------------------------------------------------------------------------------- Abhishek Kumar Research Associate Applied Mathematics Research Centre Coventry University, Coventry CV1 5FB The United Kingdom Email # ac7600@coventry.ac.uk, abhishek.kir@gmail.com ---------------------------------------------------------------------------------------