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

In order to use Vampir, You first need to generate a trace of Your application, preferrably using VampirTrace. This trace consists of a file for each MPI process and an OTF-file (Open Trace Format) describing the other files. Using environment variables (starting with VT_):

module load performance/vampirtrace

Please note, that being an MPI-tool, VampirTrace is dependent not only on the compiler being used, but also on the MPI-version.

You may recompile, specifying the amount of instrumentation You want to include, e.g. -vt:mpi for MPI instrumentation, -vt:compinst for compiler-based function instrumentation:

vtcc -vt:mpi -vt:inst compinst -o myapp myapp.c

To analyse Your application, for small traces (<16 processes, only few GB of trace data), use vampir standalone

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.

Using Vampirserver

Hermit special

Request an interactive session

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

Load the vampirserver module

module load performance/vampirserver

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)
Licensed to HLRS
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 the login node:

ssh -N -R 30000:nid03447:30000 eslogin003

ssh eslogin003.hww.de

module load performance/vampir

See also

• Vampirtrace
• Software Development Tools, Compilers & Libraries

External links

• Vampir homepage
• Vampirtrace homepage