How to find the no of files cached in linux at the time of open & loading folder

kotesh · 02-05-2010, 05:56 AM

Hey guys when we do enter on a folder it take some time for loading the folder depending on the no of entries in the folder . If the folder has more entries it take more time to load and if less no of entries then correspondingly less time . the delay in loading the folder varies due to reading of the folder entries in advance . SO what i want to know is that what is the MAX no of entries read in advance while opening a folder in linux and also how can we calculate this .

Thanks and Regards
kotesh

HasC · 02-05-2010, 02:48 PM

Not enough info, IMO. How are you browsing the filesystems? With some Gnome / KDE / other file browser? Or you're using CLI?

kotesh · 02-08-2010, 12:54 AM

It not about me implementing a piece of code where in i need some support . I want to know what happen in linux (ubuntu ) os .

syg00 · 02-08-2010, 04:31 AM

Nothing is read in advance when you first open a folder. The fact that it is slow shows it is doing physical I/O.
Once they are in the dcache, you're good to go.
Readahead is used for files - using the page cache.

kotesh · 02-09-2010, 04:26 AM

So if it the case then can we figure out what is the max no of entries that are readahead once the folder has been opened and the physical i/o is done and the entries are in dcache . Also if we can figure out then what is the way .

In simple words if i want to summarize the post then it would be like this :

In linux ie ubuntu with gnome browser. How many max no of files are readahead during openning and loading of a folder . And how to calculate that .