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.. _tutorial-statistics:
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Now that your varnish is up and running lets have a look at how it is
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doing. There are several tools that can help.
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The varnishtop utility reads the shared memory logs and presents a
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continuously updated list of the most commonly occurring log entries.
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With suitable filtering using the -I, -i, -X and -x options, it can be
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used to display a ranking of requested documents, clients, user
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agents, or any other information which is recorded in the log.
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``varnishtop -i rxurl`` will show you what URLs are beeing asked for
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by the client. ``varnishtop -i txurl`` will show you what your backend
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is beeing asked the most. ``varnishtop -i RxHeader -I
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Accept-Encoding`` will show the most popular Accept-Encoding header
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the client are sendning you.
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The varnishhist utility reads varnishd(1) shared memory logs and
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presents a continuously updated histogram showing the distribution of
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the last N requests by their processing. The value of N and the
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vertical scale are displayed in the top left corner. The horizontal
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scale is logarithmic. Hits are marked with a pipe character ("|"),
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and misses are marked with a hash character ("#").
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Varnishsizes does the same as varnishhist, except it shows the size of
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the objects and not the time take to complete the request. This gives
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you a good overview of how big the objects you are serving are.
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Varnish has lots of counters. We count misses, hits, information about
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the storage, threads created, deleted objects. Just about
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everything. varnishstat will dump these counters. This is useful when
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There are programs that can poll varnishstat regularly and make nice
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graphs of these counters. One such program is Munin. Munin can be
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found at http://munin-monitoring.org/ . There is a plugin for munin in
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the varnish source code.
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doc/sphinx/tutorial/statistics.rst
