topic Re: Calling 32bit apps from 64bit ones in Analyzers

Calling 32bit apps from 64bit ones

christoph-bartoschek — Wed, 18 Apr 2007 23:39:10 GMT

Hi,

our 64bit application has to fork off and exec a 32bit app we only have in 32bit. Currently this fails becuase
the LD_PRELOAD variable is set to a 64bit library that cannot be called.

How to say VTune that it should not profile child processes?

Re: Calling 32bit apps from 64bit ones

vprovalo — Thu, 19 Apr 2007 09:52:39 GMT

Hi, Christoph,

Could you please add some details? Which VTune version do you use, which collector (Callgraph or Sampling) and VTune error output?

Re: Calling 32bit apps from 64bit ones

christoph-bartoschek — Thu, 19 Apr 2007 10:51:47 GMT

I use version 9.0 from the vtune_linux_9.0.833.tar.gz package. Sampling does not work as described in another post. Therefore I try the Callgraph collector.

The error message is not from VTune. The application fails with:

error while loading shared libraries: /opt/intel/vtune/rdc/analyzer/bin32/libLauncherPreload.so: cannot open shared object file: No such file or directory

However it seems as if the following script helps:

#!/bin/bash
REALPROGRAM=/path/to/32bit/binary
unset LD_PRELOAD
exec $REALPRPGRAM $*

Maybre VTune should offer an option to do this automatically for selected childs

Re: Calling 32bit apps from 64bit ones

vprovalo — Mon, 23 Apr 2007 07:29:57 GMT

Hi Christoph,

Could you please tell, which processor do you use? Because that dll (/opt/intel/vtune/rdc/analyzer/bin32/libLauncherPreload.so) should only be loaded on ia32,but according to your post, profiling is run on EM64T machine.