Re: [dev] stderr: unnecessary?

From: pancake <>
Date: Sat, 12 Jun 2010 12:53:27 +0200

On Jun 12, 2010, at 9:27 AM, Connor Lane Smith <> wrote:

> On 12 June 2010 08:00, Kris Maglione <> wrote:
>> The read operation can only fetch data the size of
>> half of the entire addressable memory space of a given machine in
>> one call
> Except it can actually fetch as much data as is addressable in memory
> in a single call, if the kernel and library are tailored to.

That's why mmap is for. Using read is just stupid.

>> which has no practical implications whatsoever.
> Except efficiency: the fewer system calls required to read the data
> the fewer mode switches required, and mode switches are very
> expensive.

Not really. Modern CPUs can do the context switching in very few
specific instructions. Which handled by hw, not sw as few years ago.

I find more annoying to have a proces running more time in kernel land
than having to do multiple syscalls.

In fact there's no practical reason to use a read() of 4GB in a shot.

>> But I'm frankly not interested in fluffy notions about the future,
>> because
>> they're irrelevant.
> I am interested in the future, for that is where you and I are going
> to spend the rest of our lives [1].
> [1]

No future. You shouldn't be typing programs that can only run in
hypothetical futurist hardware.

> cls
Received on Sat Jun 12 2010 - 10:53:27 UTC

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