nginx-site: xml/en/docs/http/ngx_http_fastcgi

Documented "cache loader" and its parameters.

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-:d00a4f9b1c5d
+:5e332fafd228
 <syntax>
 <value>path</value>
 [<literal>levels</literal>=<value>levels</value>]
 <literal>keys_zone</literal>=<value>name</value>:<value>size</value>
 [<literal>inactive</literal>=<value>time</value>]
-[<literal>max_size</literal>=<value>size</value>]</syntax>
+[<literal>max_size</literal>=<value>size</value>]
+[<literal>loader_files</literal>=<value>number</value>]
+[<literal>loader_sleep</literal>=<value>time</value>]
+[<literal>loader_threshold</literal>=<value>time</value>]</syntax>
 <default/>
 <context>http</context>
 <para>
 Sets path and other parameters of a cache.
 <para>
 The special process “cache manager” monitors the maximum cache size set
 by the <literal>max_size</literal> parameter;
 when this size is exceeded it removes the least recently used data.
+</para>
+<para>
+A minute after the start the special process “cache loader” is activated
+that loads information about previously cached data stored on file system
+into a cache zone.
+A load is done in iterations.
+During one iteration no more than <literal>loader_files</literal> items
+are loaded (by default, 100).
+Besides, the duration of one iteration is limited by the
+<literal>loader_threshold</literal> parameter (by default, 200 milliseconds).
+A pause is made between iterations, configured by the
+<literal>loader_sleep</literal> parameter (by default, 50 milliseconds).
 </para>
 </directive>

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