Page History

...

Note that a set of journal files will be created for each queue declared and marked persistent. Each persistent queue has its own private journal. These are stored in the data directory by default (ie it uses the broker's --data-dir setting) or can be overridden with the --store-dir option. Note that if the broker is started with the --no-data-dir option, then no store default exists, and the --store-dir option MUST be specified.

The options that can be set control the store files store file details - or "store geometry" - can be set with command-line options. These include the size and number of files that make up the journal for each queue. The --num-jfiles options sets the number of files to use (between 4 and 64) and the --jfile-size-pgs sets the size of the file in 64kiB blocks.

The size of the pages in the write page cache is set with the --wcache-page-size option, and sets a size in KiB. (Legal values are powers of 2, ie: 1, 2, 4, 8, 16, 32, 64, 128). Typically small page sizes give improved latency (especially for small messages), but are bad for message throughput, while large page sizes improve throughput but may cause some messages to have higher latencies.

Java
TODO

Wiki Markup
\[C++ store\] What is a RHM_IORES_ENQCAPTHRESH error?

...