Talk:cloop

Computing Low‑importance

	This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing
Low	This article has been rated as Low-importance on the project's importance scale.

Linux Mid‑importance

	Linux portal This article is within the scope of WikiProject Linux, a collaborative effort to improve the coverage of Linux on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.LinuxWikipedia:WikiProject LinuxTemplate:WikiProject LinuxLinux
Mid	This article has been rated as Mid-importance on the project's importance scale.

The disadvantages section

I removed this, because it is demonstrably false:

The cloop kernel module only allows one compressed image at a time to be active.

Although you are only allowed to specify one compressed image on the insmod cloop.o command line, you can use the losetup utility to activate multiple compressed images.

I'm not sure how true the remaining two entries are.

Also, is there any reason to have a "disadvantages" section but no "advantages" section? It seems kind of out-of-place. 4.255.44.24 17:17, 1 October 2005 (UTC)[reply]

New version of software and new file format?

The description on this page, information on the linked pages, and information that can be found by search the web seems to describe an old version of cloop. For example, cloop 2.04-118 that comes with OpenSuSE 10.3 behaves very different:

multiple images can be allowed by creating additional device nodes (mknod /dev/cloop$I b 240 $I, I=0,...,7, and losetup, see also discussion section above)
create_compressed_fs does not hold the compressed data in (virtual) memory if the image is a regular file. Instead, it starts outputting data immediately (tested with a 55 GB image file). This also means that the file format must have changed since the index cannot be written at the start of the output anymore (stdout is not seekable). Jowagner (talk • contribs) 17 January 2008 (UTC)

Claimed slowness as disadvantage

The article says "The design of the cloop driver requires that compressed blocks be read whole from disk. This makes cloop access very slow when there are many small scattered reads"

In my own testing, cloop has consistently *sped up* operations on small reads. I can't reproduce the above claim at all. See my detailed results on: http://www-etud.iro.umontreal.ca/~jaegerch/div/cloop_performance_tests —Preceding unsigned comment added by Pflanze2 (talk • contribs) 18:59, 14 February 2010 (UTC)[reply]

I've added more testing, with a blocksize of 256KB (4 times the default), and can see some slowdown in one case when the CPU is artificially slowed down. I think you still need a fast disk to see the slowdown at all. Anyway the section still needs some rewording and a citation. —Preceding unsigned comment added by Pflanze2 (talk • contribs) 19:44, 14 February 2010 (UTC)[reply]

External links modified

Hello fellow Wikipedians,

I have just added archive links to one external link on Cloop. Please take a moment to review my edit. If necessary, add {{cbignore}} after the link to keep me from modifying it. Alternatively, you can add {{nobots|deny=InternetArchiveBot}} to keep me off the page altogether. I made the following changes:

Added archive http://web.archive.org/web/20110706211225/http://www-etud.iro.umontreal.ca/~jaegerch/div/cloop_performance_tests to http://www-etud.iro.umontreal.ca/~jaegerch/div/cloop_performance_tests

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—^{cyberbot II}_{Talk to my owner:Online} 21:17, 28 February 2016 (UTC)[reply]