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** kstartperf: startup time measurement for KDE apps **
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** Usage:
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kstartperf measures startup time for KDE applications. Usage is simple:
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$ kstartperf konsole
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will show you the startup time of konsole in milliseconds.
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** How does it work?
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1. Kstartperf stores the current time with microsecond resolution in an
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environment variable ($KSTARTPERF).
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2. Kstartperf executes the requested application, but with a LD_PRELOAD
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library that overrides the X11 XMapWindow() function.
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3. As soon as the app calls XMapWindow (this is the point where we assume
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that the app has "started up"), our function is called instead of the
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original XMapWindow(). This function calculates the time difference
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between the current time and the time stored in the environment variable
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and prints this information to standard error.
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4. Our function disables itself and calls the original XMapWindow().
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** Notes
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The appliation that is being profiled, needs to be linked against tdecore.
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Geert Jansen <jansen@kde.org>,
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20 July 2000
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