Improvements to the Jetty documentation.
Updated the bytebufferpool module documentation. Signed-off-by: Simone Bordet <simone.bordet@gmail.com>
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==== Module `bytebufferpool`
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==== Module `bytebufferpool`
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The `bytebufferpool` module allows you to configure the server-wide `ByteBuffer` pool.
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The `bytebufferpool` module allows you to configure the server-wide `ByteBuffer` pool.
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Pooling ``ByteBuffer``s results in less memory usage and less pressure on the Garbage Collector.
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// TODO: expand
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``ByteBuffer``s are pooled in _buckets_; each bucket as a capacity that is a multiple of a capacity factor that you can configure.
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For example, if a request for a `ByteBuffer` of capacity 2000 is requested, and the capacity factor is 1024, then the pool will allocate a buffer from the second bucket, of capacity 2048 (1024 * 2).
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Applications that need to sustain many concurrent requests -- or load spikes -- may require many buffers during peak load. These buffers will remain pooled once the system transitions to a lighter load (or becomes idle), and it may be undesirable to retain a lot of memory for an idle system.
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It is possible to configure the max heap memory and the max direct memory that the pool retains.
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Excess buffers will not be pooled and will be eventually garbage collected.
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The module file is `$JETTY_HOME/modules/bytebufferpool.mod`:
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The module file is `$JETTY_HOME/modules/bytebufferpool.mod`:
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@ -26,4 +33,8 @@ include::{JETTY_HOME}/modules/bytebufferpool.mod[]
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Among the configurable properties, the most relevant are:
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Among the configurable properties, the most relevant are:
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TODO
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`jetty.byteBufferPool.maxHeapMemory`::
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This property allows you to cap the max heap memory retained by the pool.
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`jetty.byteBufferPool.maxDirectMemory`::
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This property allows you to cap the max direct memory retained by the pool.
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# DO NOT EDIT - See: https://www.eclipse.org/jetty/documentation/current/startup-modules.html
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[description]
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[description]
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Configures the ByteBufferPool used by ServerConnectors.
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Configures the ByteBufferPool used by ServerConnectors.
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etc/jetty-bytebufferpool.xml
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etc/jetty-bytebufferpool.xml
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[ini-template]
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[ini-template]
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### Server ByteBufferPool Configuration
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## Minimum capacity of a single ByteBuffer.
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## Minimum capacity to pool ByteBuffers
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#jetty.byteBufferPool.minCapacity=0
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#jetty.byteBufferPool.minCapacity=0
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## Maximum capacity to pool ByteBuffers
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## Maximum capacity of a single ByteBuffer.
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## Requests for ByteBuffers larger than this value results
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## in the ByteBuffer being allocated but not pooled.
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#jetty.byteBufferPool.maxCapacity=65536
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#jetty.byteBufferPool.maxCapacity=65536
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## Capacity factor
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## Bucket capacity factor.
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## ByteBuffers are allocated out of buckets that have
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## a capacity that is multiple of this factor.
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#jetty.byteBufferPool.factor=1024
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#jetty.byteBufferPool.factor=1024
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## Maximum queue length for each bucket (-1 for unbounded)
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## Maximum queue length for each bucket (-1 for unbounded).
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#jetty.byteBufferPool.maxQueueLength=-1
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#jetty.byteBufferPool.maxQueueLength=-1
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## Maximum heap memory retainable by the pool (-1 for unlimited)
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## Maximum heap memory retainable by the pool (-1 for unlimited).
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#jetty.byteBufferPool.maxHeapMemory=-1
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#jetty.byteBufferPool.maxHeapMemory=-1
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## Maximum direct memory retainable by the pool (-1 for unlimited)
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## Maximum direct memory retainable by the pool (-1 for unlimited).
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#jetty.byteBufferPool.maxDirectMemory=-1
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#jetty.byteBufferPool.maxDirectMemory=-1
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