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# Difference between revisions of "Vampir"

The Vampir suite of tools offers scalable event analysis through a nice GUI which enables a fast and interactive rendering of very complex performance data. The suite consists of Vampirtrace, Vampir and Vampirserver. Ultra large data volumes can be analyzed with a parallel version of Vampirserver, loading and analysing the data on the compute nodes with the GUI of Vampir attaching to it.

Vampir is based on standard QT and works on desktop Unix workstations as well as on parallel production systems. The program is available for nearly all platforms like Linux-based PCs and Clusters, IBM, SGI, SUN. NEC, HP, and Apple.

 Developer: GWT-TUD GmbH Platforms: Category: Performance Analyzer License: Commercial Website: Vampir homepage

## Usage

Vampir consists of a GUI interface and a analysis backend. In order to use Vampir, You first need to generate a trace of Your application, preferably using VampirTrace. The Open Trace Format (OTF) trace consists of a file for each MPI process (*.events.z) a trace definition file (*.def.z) and the master trace file (*.otf) describing the other files. Fore details how to generate OTF traces see Vampirtrace.

To analyze small traces (< 500 MB of trace data), you can use Vampir standalone with the default backend:

module load performance/vampir vampir

For large-scale traces (up to many thousand MPI processes), use the parallel VampirServer (on compute nodes allocated through the queuing system), and attach to it using vampir:

>qsub -I -lnodes=16:nehalem:ppn=8,walltime=1:0:0 qsub: waiting for job 297851.intern2 to start qsub: job 297851.intern2 ready ... module load performance/vampirserver mpirun -np 256 vampirserver-core VampirServer 7.5.0 Licensed to HLRS Running 255 analysis processes. Server listens on: n010802:30000

then on the head-node use the Vampir-GUI to "Remote open" the same file by attaching to the heavy-weight, compute nodes:

Please note, that vampirserver-core is memory-bound and may work best if started with only one MPI process per node, or one per socket, e.g. use Open MPI's option to mpirun -bysocket.

## VampirServer

Vampir-Server is the parallel version of the graphical trace file analyzing software. The tool consists of a client and a server. The server itself is a parallel MPI Program.

First load the necessary software module

Now start the server and afterwards the client

on laki:

mpirun -np 4 vampirserver-core &

on hermit:

aprun -n 4 vampirserver-core &

Remember the port number which will be displays as you will need it later on. Then start the graphical client

vng

The last step is to connect the client to the server using the port number offered you from the server. This is done under

file $\rightarrow$ Connect to Server ...


Then you can open your traces via

file $\rightarrow$ Open Tracefile  ...


Select the desired *.otf file

### Hermit special

Request an interactive session

qsub -IX -lmppwidth=64 -lmppnppn=32 -lwalltime=2:00:00

Load the vampirserver module

Start the vampirserver on the compute nodes using

vampirserver start -n 63 aprun

This will show you a connection host and port:

Launching VampirServer...
VampirServer 7.6.2 (r7777)
Running 31 analysis processes... (abort with vampirserver stop 10)
VampirServer <10> listens on: nid03447:30000

Warning: The number of analysis processes must not exceed the number of processes requested with -lmppwidth minus one!

Now forward this to one of the login nodes:

ssh -N -R 30000:nid03447:30000 eslogin003

Open a new terminal and login to the login node selected in the command before: