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Firefox OS/MappedArrayBuffer: Difference between revisions
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: The feature allows to read data in packaged app by XHR with array buffer type as memory-mapped. | : The feature allows to read data in packaged app by XHR with array buffer type as memory-mapped. | ||
: It helps to save RAM memory usage, especially for big data files in a packaged app. For example, when enabled, the word suggestion/auto correction or the IME database in the keyboard APP no longer consumes RAM memory. | : It helps to save RAM memory usage, especially for big data files in a packaged app. For example, when enabled, the word suggestion/auto correction or the IME database in the keyboard APP no longer consumes RAM memory. | ||
== Support status == | == Support status == | ||
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[[File:Arraybuffer mapping.png|640px]] | [[File:Arraybuffer mapping.png|640px]] | ||
:[1] Page size on 32-bits Linux is | :[1] Page size on 32-bits Linux is 4K bytes. | ||
:[2] Bug 855669 - Figure out how emscripten &co can decommit memory | :[2] Bug 855669 - Figure out how emscripten &co can decommit memory | ||
== Use it or not? == | |||
To determine whether to use it, you may want to consider these factors: | |||
* RAM size | |||
* Flash size | |||
* File size | |||
** There might be no memory saving when the file size belows 8K bytes. | |||
* File compression ratio | |||
== How to use it? == | == How to use it? == | ||