On Jun 30, 2011, at 3:02 AM, Jean-Daniel Dupas wrote: > Le 30 juin 2011 à 08:19, James Merkel a écrit : > >> Ok, I'm looking at my application in Instruments File Activity. The column >> labeled FD I assume means file descriptors. Is that the total number of FDs >> in use at any given time? > > No, Just like process ID, file descriptor number can be reused by the system.
That analogy is a bit flawed. Process IDs are global across the system. File descriptors are per-process. > And there is absolutely no guarantee the system use simple incremental value > for fd AFAIK. Actually, when a new file descriptor is created for your process, it does use the lowest unused descriptor number (except for dup2()). Still, the File Activity instrument's event list isn't showing a count of file descriptors, it's showing the specific individual file descriptor involved in the specific event. But there's a pretty good chance that the highest file descriptor you see across a significant range of events roughly indicates the count of open descriptors. Regards, Ken _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
