Re: dealloc and scarce resources
Re: dealloc and scarce resources
- Subject: Re: dealloc and scarce resources
- From: Ken Thomases <email@hidden>
- Date: Thu, 30 Jun 2011 04:01:12 -0500
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
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