> "Simon Marlow" <[EMAIL PROTECTED]> writes:
> > To fix these
> > problems you have to think carefully about strictness and
> demand in your
> > program. For memory we have heap profilers to help out,
> but we don't
> > have I/O descriptor profilers for lazy I/O!
>
> Surely I/O descriptors are just a type of heap-value, and as such
> can be profiled in the normal way (producer, retainer, etc), just
> like any other heap construction?
File descriptors are held in the kernel, not the heap. Hmmm, I suppose
you could track Handles, which notionally "hold on to" a file
descriptor, but it's not completely reliable because a Handle will be
held by a finalizer for an unspecified period of time before the
descriptor is released. In practice it might not be a serious problem
unless there are lots of other threads.
Cheers,
Simon
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