DownCacheSize as anticipated, this setting determines the max number in Java Get ANSI/AIM Code 128 in Java DownCacheSize as anticipated, this setting determines the max number

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DownCacheSize as anticipated, this setting determines the max number use servlet ansi/aim code 128 implement torender code 128a for java QR Code Features of messages that j2se Code 128 Code Set C the DownCache will hold before they are flushed to storage. This enables the write to occur as a single operation, thus aiding performance..

[ 143 ]. Tuning the Middleware Services PageSize when lo ading messages from the queue or subscription, this is the maximum number of messages to pre-load in one single operation. Also, this element is crucial for the performance of heavy-duty JMS applications. Discovering the optimal PageSize requires some trials; you can try increasing it, until you hit a plateau, which means you have reached the optimal page size.

For example, running a benchmark of 100.000 messages, each one with a payload of 1 KB, you will see that a PageSize of 5000 messages is the optimal value, using a typical developer configuration..

Tuning HornetQ (JBoss AS 6.x). HornetQ is the n ew high performance messaging provider for the JBoss AS 6.x release. Its core has been designed as a simple set of Plain Old Java Objects (POJOs) without any dependencies on any other JBoss classes which is why it can be used stand-alone, embedded in your applications, or integrated with the application server.

The main configuration file is located in the folder, <server>/deploy/hornetq/ hornetq-configuration.xml. The two key elements, which can influence your application"s performance, are the journal and transport configuration.

The journal handles the persistence of messages and transactions using a high performance algorithm implemented by the HornetQ team. The transport configuration is based on Netty, which is an asynchronous event-driven network application framework..

[ 144 ]. 5 . How to configure HornetQ journal for optimal performance This is the part of the configuration related to the journal:. <journal-dire Code 128B for Java ctory> ${

dir}/hornetq/journal </journal-directory> <journal-min-files>10</journal-min-files>. In order to tune HornetQ"s journal you have to check its configuration in the file hornetq-configuration.xml..

journal-directory is the filesystem directory where the journal is written. Put the journal on its own physical volume. If the disk is shared with other processes for example, transaction co-ordinator, database or other journals which are also reading and writing from it, then this may greatly reduce performance since the disk head may be skipping all over the place between the different files. created.

If you see new files being created on the journal data directory too often, i.e. lots of data is being persisted, you need to increase the minimal number of files, this way the journal would reuse more files instead of creating new data files.

HornetQ transpar spring framework code128b ently supports huge queues containing millions of messages while the server is running with limited memory with the paging feature. In such a situation, it"s not possible to store all of the queues in memory at any one time, so HornetQ transparently pages messages into and out of memory as they are needed, thus allowing massive queues with a low memory footprint. HornetQ will start paging messages to disk, when the size of all messages in memory for an address exceeds a configured maximum size.

Paging directory is configured by default in the following directory: <paging-directory>${

dir}/hornetq/ paging</paging-directory>. journal-min-files reflects the minimum number of journal files to be Other parameters Code 128 for Java which are not specified in the default configuration are: . journal-file-size: The journal file size should be aligned to the capacity of a cylinder on the disk. The default value 10 MB should be enough on most systems. [ 145 ]. Tuning the Middleware Services journal-type: Th is parameter lets you choose the I/O libraries which are used to append data to the journal. Valid values are NIO or ASYNCIO..

Choosing NIO sel swing Code 128B ects the Java NIO journal. Choosing ASYNCIO selects the Linux asynchronous IO journal. If you choose ASYNCIO but are not running Linux, or you do not have libaio installed, then HornetQ will detect this and automatically fall back to using NIO.

The Java NIO journal gives great performance, but if you are running HornetQ using Linux Kernel 2.6 or later, we highly recommend using the ASYNCIO journal for the best persistence performance especially under high concurrency. case where you have many producers and thus it combines multiple writes in a single OS operation.

So, setting this option to false will give you a performance boost, making your system scale much better. However if you have few producers, it might be worth setting this property to true, which means that your system will flush every sync with an OS call..

Do you need mess age security and persistence If you don"t need message persistence, you might greatly increase the performance of your JMS applications by setting persistence-enabled to false in hornetqconfiguration.xml. You may get as well a small performance boost by disabling security by setting the security-enabled parameter to false.

journal-aio-flush-on-sync: HornetQ, by default, is optimized by the.
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