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37 lines
1.3 KiB
Text
37 lines
1.3 KiB
Text
Performance Profiling
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---------------------
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Code profiling is implemented through a few macros in ntopng, those macros can
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be enabled by uncommenting the line below in include/ntop_defines.h
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#define PROFILING
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In order to record the time a block of code takes to execute, you need to use the
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PROFILING_SECTION_ENTER and PROFILING_SECTION_EXIT macros to create sections.
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Example:
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PROFILING_SECTION_ENTER(<label>, <section id>)
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sleep (1);
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PROFILING_SECTION_EXIT(<section id>)
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Each section requires a label (char *) and a unique id (uint).
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The section id is an index in an array of sections. The number of sections
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should be defined with PROFILING_DECLARE(<num>), see for example
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include/NetworkInterface.h.
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Example:
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PROFILING_DECLARE(32);
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In order to print the time (ticks) a section takes, you should use the
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PROFILING_SECTION_AVG(<section id>, <iterations>) macro, providing the
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section id and the number of iterations (number of times the section
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has been traversed).
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See for example NetworkInterface::~NetworkInterface() in src/NetworkInterface.cpp
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Example:
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for (i = 0; i < PROFILING_NUM_SECTIONS; i++) {
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if (PROFILING_SECTION_LABEL(i) != NULL)
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "[PROFILING] Section #%d '%s': AVG %llu ticks",
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i, PROFILING_SECTION_LABEL(i), PROFILING_SECTION_AVG(i, n));
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}
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