[Paraview] no improvement while using in parallel

[Utkarsh Ayachit]

Is it possible to share the data (feel free to share that off the
list). It may be easier to diagnose the problem that way.

Utkarsh

On Tue, Jan 22, 2013 at 11:46 AM, Kevin Hackel <kevin.hackel at online.de> wrote:
> Hello all,
>
> I’m trying to use paraview in parallel. For that I’ve got a self-compiled
> paraview version 3.14 and I use client/server mode.
> In paraview I use these settings: use multicore, remote render threshold
> (100MByte), client outline threshold (0MByte) and interactive subsample rate
> (2pixels).
>
> I’ve got unstructered test data. The data was created in four processes as
> *.vtu file (4times 352MByte) or as a whole *.pvtu file.
>
> So I start with ssh the pvservers on the server (there are 48cores on the
> server) with
> mpirun –np ‘number’ ../pvserver –display localhost:0
> and then I connect via my PC to this server (there’s a ethernet cable with
> 1GB/s between server and PC).
>
> I tried different numbers of pvservers (2,4,8 and 16).
> I loaded the data and used different filters like wireframe, contour, slice
> and clip and I moved the data around (with drag and drop).
>
> But I could only see a little improvement in the time of representation
> (e.g. the contour filter took 5.3s on 4pvservers and 5s on 16pvservers).
> I thought I could see a greater improvement.
>
> So why do I see no improvement or when can I see an improvement? Or am I
> doing something wrong?
>
> Also I’m surprised that it took lesser than 4 times as long when I use the
> whole data in compare with only a fourth of the data.
> e.g. on 16 pvservers it took 6s to change the representation of a fourth of
> the data to wireframe and it took 20s for the whole data
> Why is this happening?
>
> Thank you for your help.
>
>
> Greetings,
> Kevin
>
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