Just an update :-
As a workaround of the problem , i ran my typeperf.exe command in my perl script instead of individual TCLs. The automation now works fine , but am still not able understand why it was failing with original code.

For running in background i am using

system (1,"typeperf -si 1 -o output.txt") ;

In reply to Re: SYSTEM Call of PERL hangs application when running a TCL script by kalama
in thread SYSTEM Call of PERL hangs application when running a TCL script by kalama

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