File descriptor usage statistics

[giampaolo]

From tiran79 on June 15, 2012 13:44:47

Proposal  
psutil is missing a function that displays full FD usage for a process. The 
combination of get_open_files() and get_connections() doesn't list all FDs as 
psutil skips unknown types and stdin/out/err. The total amount of FDs is a very 
useful information as the amount is usually small (1024-4096) on most 
platforms. 

On what platforms would this be available?  
All 

Proposed API  
process.get_fd_usage() -> fdinfo(count=int, softlimit=int, hardlimit=int) 

Are there existent implementations we can use as an example?  
In Linux, the implementation is pretty straight forward. count = 
len(os.listdir("/proc/PID/fd"), the hard and softlimit can be acquired with 
prlimit() or from "/proc/PID/limits".

Original issue: http://code.google.com/p/psutil/issues/detail?id=284

[giampaolo]

From g.rodola on June 17, 2012 14:44:42

I like the idea. prlimit() is Linux only though, and I don't like returning a 
tuple which makes sense on 1 platform out of 4. We can probably add a 
get_num_fds() method returning an int (POSIX only as on Windows we already have 
get_num_handles which is similar).

[giampaolo]

From g.rodola on June 18, 2012 05:48:29

Implemented in r1349 , r1350 , r1351 .

Status: FixedInSVN
Labels: Milestone-0.5.0

[giampaolo]

From g.rodola on June 27, 2012 11:54:03

0.5.0 is finally out. Closing out as fixed.

Status: Fixed

[giampaolo]

From tiran79 on June 27, 2012 14:47:16

Thanks! Your implementation is more than sufficient for my needs. The idea with 
hard and soft limit was more like gimmick. I just need the information for the 
current Linux process so I can use the resource module.

[giampaolo]

From g.rodola on March 02, 2013 04:09:19

Updated csets after the SVN -> Mercurial migration: r1349 == revision ???