[Paraview] C++ Catalyst vtkSocket::Receive stuck in loop on Windows

[Simon Klarmann]

Sorry I think I have chosen the wrong reply method.

 

Hi Andy,

 

I already got rid of Python on both sides. CoProcessing with Live connection is working by directly using the vtkLiveInsituLink (pure C++ implementation).

 

Working with both Paraview 5.2  and 5.4.

 

My problem is closing the connection on the Live side (e.g. closing Paraview). Doing so, my Insitu side hangs (when trying again to send data, m_link->InsituUpdate, see below) in the receive method of the vtkSocket class until at some point an integer underflow happens.

 

Closing the connection from the Insitu side everything works as expected. 

 

Are there any methods to directly check if the connection is still alive?

Or is it a Windows specific problem?

 

 

 

Additionally the steps for the live connection in C++, for sure there may be more elegant ways:

 

// Initialization

 

vtkCPProcessor  *m_proc = vtkCPProcessor::New();

                m_proc->Initialize();

 

                vtkLiveInsituLink  *m_link = vtkLiveInsituLink::New();

                m_link->SetInsituPort(22222);

                m_link->SetHostname("localhost");

                m_link->SetProcessType(vtkLiveInsituLink::INSITU);

 

                vtkSMProxyManager  *m_spxm = vtkSMProxyManager::GetProxyManager()->GetActiveSessionProxyManager();

                vtkSMProxy *m_px = m_spxm->NewProxy("sources", "PVTrivialProducer");

                vtkSMSourceProxy *m_spx = vtkSMSourceProxy::SafeDownCast(m_px);

                m_spxm->RegisterProxy("sources", m_spx);

 

                vtkObjectBase *obase = m_spx->GetClientSideObject();

                vtkPVTrivialProducer *prod =

                               vtkPVTrivialProducer::SafeDownCast(obase);

                prod->SetOutput(m_toplot, m_time);    // m_toplot is a vtkMultiBlockDataSet

 

                m_link->Initialize(m_spxm);

 

                

                //Update the live side

                m_link->InsituUpdate(m_time, m_tstep);

m_spx->UpdatePipeline(m_time);

m_link->InsituPostProcess(m_time,m_tstep);

 

 

Thanks,

Simon

 

 

 

 

 

Von: Andy Bauer [mailto:andy.bauer at kitware.com] 
Gesendet: Donnerstag, 6. Juli 2017 17:14
An: Simon Klarmann
Cc: paraview at paraview.org
Betreff: Re: [Paraview] C++ Catalyst vtkSocket::Receive stuck in loop on Windows

 

Hi Simon,

 

Is the Python dependency that you're trying to get rid of on the Catalyst side or on the pvserver/GUI side? If I remember correctly on the Catalyst side Python was required for the Live connection. 

 

Cheers,

Andy

 

On Wed, Jul 5, 2017 at 10:11 AM, Simon Klarmann <klarmann at mechanik.tu-darmstadt.de> wrote:

Dear Members,

 

I wanted to get rid of the dependency on Python. The connection by pure C++ works just fine.

 

The problem occurs when establishing the live connection to Paraview, closing Paraview and then try to send some data again.

I tracked it down to the vtkSocket class inside the method Receive. After the connection is terminated on the Paraview side, e.g. by closing Paraview, the call of vtkLiveInsituLink::InsituUpdate gets stuck in the vtkSocket::Receive method. Even though I get a message that the connection was terminated.

 

A temporary fix for my case was to replace in Line 609 of the vtkSocket.cxx if (nRecvd == 0) with if (nRecvd <= 0), because on disconnection the return value of nRecvd is -1. Then everything works well.

 

I only used the following methods in the given order to transfer the data:

 

vtkLiveInsituLink::InsituUpdate

vtkSMSourceProxy::UpdatePipeline

vtkLiveInsituLink::InsituPostProcess

 

 

Are there further steps to perform or is there a way to check if the connection is still alive?

 

 

Operating System: Windows 7, Visual Studio 2017

 

Thanks,

Simon

 

 

 

 

Dipl.-Ing. Simon Klarmann

 

Bau- und Umweltingenieurwissenschaften
Technische Universität Darmstadt

Fachgebiet Festkörpermechanik

 

Tel.: +49 6151 16 – 22642 <tel:+49%206151%201622642> 

Mail: klarmann at mechanik.tu-darmstadt.de

Franziska-Braun-Straße 7

Gebäude L5|01, Raum 542

64287 Darmstadt

 


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