On 3/09/2013 10:29 a.m., Eliezer Croitoru wrote:
Hey there, Since squid holds an internal DB there is no lookup that should be done on the file system level such as "ls |grep file_name" in order to find the file and to fetch all the details from the indoe.
FWIW: There is a translation step done in the OS to convert file path to inode value (Squid does not know that bit). This usually involves a scan of the directory listing in the FS itself (be it a list/tree walk, hash lookup, or whatever). It doubtless has a lot of FS-specific optimization which leads to varying results by different people tuning, but still takes some few nano- or pico-seconds however it gets sliced. I believe this is what Duane was referring to in that quoted text. However, notice also that he couches it as supposition and uses "probably" on the advice conclusion. This is theoretical. I expect that there were feedback reports (ie "Some people seem to think ...") but no factual detailed analysis backing the idea. You may be able to find some analysis on it if you can spare the time to dig into storage peoples documentation and analysis - but I've never had that much time, s for now ... "your mileage *will* vary": experimentation on your production boxen is needed to know for certain.
But yes, overall you do not want to stress the FS directory limit if you can avoid it with a small tweak in the config.
Amos
