profiling in QTCreator

[prkhr4u]

I am absolutely new to profiling in QTCreator.
Here is what I am doing:

1) Set the build to Release mode
2) Analyze>QML Profiler>Start
It is showing error:

Could not connect to the in-process QML profiler.
Do you want to retry?

Could not connect to the in-process QML profiler.
Do you want to retry?

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Even after retrying nothing happening
3) Analyze>Valgrind Memory Analyzer>Start
error:

Analyzing memory of /home/hls/Grab-build-desktop-Qt_4_8_1_in_PATH__System__Release/Grab
** Error: "valgrind" could not be started: No such file or directory **
** Analyzing finished **

Analyzing memory of /home/hls/Grab-build-desktop-Qt_4_8_1_in_PATH__System__Release/Grab
** Error: "valgrind" could not be started: No such file or directory **
** Analyzing finished **

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I checked physically,the executable file Grab is there in the above said directory
4) Analyze>Valgrind Function profiler>Start
error:

You are trying to run the tool "Valgrind Function profiler" on an application in Debug mode.The tool is designed to be used in Release mode

You are trying to run the tool "Valgrind Function profiler" on an application in Debug mode.The tool is designed to be used in Release mode

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I am using it in release mode only.

I guess I am missing some configuration.Can someone tell what I am missing?

[prkhr4u]

I have solved the issue,had to install 'valgrind' externally.