It uses D-Bus. The server is only involved in writes and is not activated in the user session until the user modifies a preference. The service is stateless and can exit freely at any time and is therefore robust against crashes.
The list of paths that each process is watching is stored within the D-Bus daemon itself as D-Bus signal match rules. Reads are performed by direct access via mmap to the on-disk database which is essentially a hashtable. For this reason, dconf reads typically involve zero system calls and are comparable to a hashtable lookup in terms of speed. Practically speaking, in simple non-layered setups, dconf is less than 10 times slower than GHashTable.
Writes are assumed only to happen in response to explicit user interaction like clicking on a checkbox in a preferences dialog and are therefore not optimised at all. On some file systems, dconf-service will call fsync for every write, which can introduce a latency of up to ms. This latency is hidden by the client libraries through a clever "fast" mechanism that records the outstanding changes locally so they can be read back immediately until the service signals that a write has completed.
The binary database format that dconf uses by default is not suitable for use on NFS, where mmap does not work well. The user's personal database always takes the highest priority, followed by the system databases in the order prescribed by the profile. Most answers here are either obsolete or wrong. It is recommended that your application put its files in a subdirectory of the above directories. When saving, save to user-specific directories only since the user probably won't have write access to system directories.
It defines directories for the Desktop, downloads, documents, videos, etc. Generally speaking, command line options will override environment variables which will override user defaults which will override system defaults.
Some additional info from tutorialhelpdesk. In Windows, almost all programs install their files all files in the directory named: 'Program Files' Such is not the case in Linux. The directory system categorizes all installed files.
Here is the entire directory structure along with what they contain:. All files and directories are logically contained inside the root directory regardless of their physical locations. Linux treats each device as a special file. It contains the information about various aspects of a Linux system. Commands such as mount, shutdown, umount, reside here. The contents of this directory are cleared each time the system boots.
It is not part of the core Linux operating system. Programs modify this when they run. Please do also consult the Filesystem Hierarchy Standard. Edit: The other answers are right, per-user configuration is usually stored in dot-files or dot-directories in the users home directory.
Anything above user level often is a lot of guesswork. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Introduction As other answers on this site discuss gconf and dconf together, I will just concentrate on discussing command-line tools such as gsettings and the gui dconf-editor that are used to access the dconf database.
Using gsettings to view and change settings Once one gets to know gsettings it can be as easy as the gui dconf-editor. To list all the available schemas, enter gsettings list-schemas To also include all the keys, enter gsettings list-recursively However , it is usually easier to specify what you want with, for examples, gsettings list-schemas grep -i shotwell This returns a long list; I have shortened it to: org.
Using dconf-editor to change settings The GUI program, dconf-editor is installed with dconf-tools package by clicking here or by running sudo apt-get install dconf-tools Then run it by entering in the terminal or in the quick launch menu, dconf-editor.
Conclusion There are many other useful ways that you can tweak settings with both gsettings and dconf-editor and they are straightforward to use.
As fossfreedom recently showed in this question How do I edit the list of music library locations in Rhythmbox? See also: How do I use the gconf editor? Improve this answer. Pablo Bianchi 9, 3 3 gold badges 48 48 silver badges 89 89 bronze badges.
Since the programs gsettings and dconf-editor work both on the dconf database, why don't they show the same information? Launcher and the key favorites but dconf-editor does not even offer com.
Unity let alone the full schema or the key. H: good question. I've asked it here: askubuntu. I'm sorry that I forgot to answer your comment: I can't comment on Unity because I'm on Xubuntu, but Flimm has asked a separate question which should get some good answers. But what on earth makes dconf incompatible with Qt, a GUI toolkit? Show 1 more comment. It's not only gnome equivalent, but all DE Desktop Environment equivalent.
Prado Not true, not all DE use dconf. You completed my comment. What is the relationship between dconf and gconf? The question in psusi 's comment above is partially answered in the answers to the question " Why the controversy about dconf and gconf? I'm sure psusi is aware of it, having commented on the question, but in case anyone else wants to know more, there it is.
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