MantisBT - ParaView

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Date Submitted

Last Update

0006773

ParaView

(No Category)

public

2008-04-08 13:00

2011-01-13 17:00

Reporter

Ken Moreland

Assigned To

Utkarsh Ayachit

Priority

normal

Severity

minor

Reproducibility

have not tried

Status

closed

Resolution

fixed

Platform

OS Version

Product Version

Target Version

3.4

Fixed in Version

3.4

Project

Topic Name

Type

Summary

0006773: Use Broadcast to propagate commands from root sever node to other server nodes

Description

As we all know, the PV client connects to node 0 of servers and sends commands to that node. That node propagates commands to the other server nodes (as appropriate).

This is implemented using the ProcessRMIs method in vtkMultiProcessController. This means that each node waits in a MPI_Recv from any command. Node 0 then iteratively sends a message to each of the other nodes.

This is not a very efficient way to broadcast messages. Instead, everyone should use the Broadcast method to propagate the requests. (Broadcast is now part of vtkMultiProcessController.)

Steps To Reproduce

Additional Information

When working correctly, the current method isn't a huge deal. However, there is a bug in the buffer management code of OpenMPI that is causing node 0 to eat up a bunch of memory. This is a killer for one of our important uses and the main driver for this bug.