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**This document is a draft and not finished yet. As soon as it is finished, it will be accessible through the menu**
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Todos:
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* LIKWID_MARKER_SWITCH
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* LIKWID_MARKER_GET
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* LIKWID_MARKER_RESET
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* LIKWID_MARKER_THREADINIT
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# Motivation
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Most users of LIKWID that want to measure just a region of their code, like to use LIKWID's MarkerAPI. The MarkerAPI is a set of macros/functions that can be embedded in the code and turned on and off at compile time. In contrast to other tools that support measuring regions of code, the MarkerAPI just specifies where to measure but not what to measure. The configuration is done from the outside by using LIKWID's `likwid-perfctr` or by setting the appropriate environment variables.
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