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Top Forums UNIX for Advanced & Expert Users Memory fragmentation in a Linux settop box Post 302917555 by achenle on Wednesday 17th of September 2014 12:44:43 PM
Old 09-17-2014
That depends on how you're doing your IO operations. How are your apps coded to do read and/or stream your files? Do you have control over your application IO? What filesystem(s) are you using for data?

Assuming you're streaming video files without much random searching, you should be using direct IO and bypassing the cache since it's extremely unlikely that the proper file data will be cached when you do any searching.

Direct IO will be faster and it won't fragment memory because you won't be using the page cache.

Caching of file data only helps when data can be held in memory long enough to allow multiple reads of the same data, or when write operations are small and/or slow enough to be effectively coalesced into a smaller number of write operations. Streaming or copying large files fits neither of those criteria.
 

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GTK-UPDATE-ICON-C(1)						  [FIXME: manual]					      GTK-UPDATE-ICON-C(1)

NAME
gtk-update-icon-cache - Icon theme caching utility SYNOPSIS
gtk-update-icon-cache [--force] [--ignore-theme-index] [--index-only] [--source [name]] [--quiet] [--validate] {iconpath} DESCRIPTION
gtk-update-icon-cache creates mmap()able cache files for icon themes. It expects to be given the path to a icon theme directory containing an index.theme, e.g. /usr/share/icons/hicolor, and writes a icon-theme.cache containing cached information about the icons in the directory tree below the given directory. GTK+ can use the cache files created by gtk-update-icon-cache to avoid a lot of system call and disk seek overhead when the application starts. Since the format of the cache files allows them to be mmap()ed shared between multiple applications, the overall memory consumption is reduced as well. OPTIONS
--force, -f Overwrite an existing cache file even if it appears to be uptodate. --ignore-theme-index, -t Don't check for the existence of 'index.theme' in the icon theme directory. Without this option, gtk-update-icon-cache refuses to create an icon cache in a directory which does not appear to be the toplevel directory of an icon theme. --index-only, -i Don't include image data in the cache. --source, -c Output a C header file declaring a constant name with the contents of the icon cache. --quiet, -q Turn off verbose output. --validate, -v Validate existing icon cache. BUGS
None known yet. [FIXME: source] 05/02/2010 GTK-UPDATE-ICON-C(1)
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