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Since a typical GNOME login consists of thousands of reads and ideally 0 writes, dconf is optimized for reads. Typically, reading a key from dconf involves zero system calls and zero context switches. This is achieved with a simple file format that doubles both as the storage format for data in dconf
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A GVariant may contain simple types, like integers, or boolean values; or complex types, like an array of two strings, or a dictionary of key value pairs. A GVariant is also immutable: once it's been created, neither its type nor its content can be modified further. GVariant is useful whenever data
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service – in the ordinary way. Change notification is also handled by the writer. The reason for having a bus service at all is that getting the clients to synchronize on writing would be very difficult.
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The service is completely stateless and can start and stop dynamically. The list of change notifications that an individual client is interested in is maintained by the bus daemon (as a D-Bus signal watch/match list).
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to do a better job by saturating it with requests coming from all of the applications trying to read their keys (as opposed to a common configuration server serially requesting a single key at a time).
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inside of each user's configuration space. A single configuration source may appear at multiple points in the hierarchy. For example, in addition to stacking over the normal keys at
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Having all of the keys in a single compact binary format also avoids the intense fragmentation problems currently experienced by the tree-of-directories-of-xml-files approach.
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dconf is a simple key-based configuration system. Keys exist in an unstructured database (but it is intended that keys that logically belong together are grouped together).
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Avoiding round trips and context switches is desirable in itself, but the real advantage comes from allowing the I/O scheduler in the
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used for all the values stored in dconf; it can contain one or more values along with information about the type of the values.
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integration is planned so that a normal user may temporarily gain the ability to, for example, write to the keys under
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needs to be serialized, for example when sending method parameters in DBus, or when saving settings using GSettings.
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One dconf database consists of a single file in binary format, i.e. it is not a text-file. The format is defined as
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Writes are less optimized – they traverse the bus and are handled by a "writer" – a
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The stacking can be done at "mount points". For example, the global system configuration can be mounted under
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The GSettings class provides a high-level API for application for storing and retrieving their own settings.
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is a low-level configuration system and settings management tool. Its main purpose is to provide a
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on platforms that don't already have configuration storage systems. It depends on
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for inspection and modification by a system policy configuration utility.
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for dconf is available. Since version 0.2, dconf is licensed under the
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gives access to a certain popular subset of the desktop settings.
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configuration utility no longer have to be run as root.
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https://developer.gnome.org/gio/stable/GSettings.html
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The GNOME database file for each user is by default
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770:. 13 March 2021
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