test largefile support (test_largefile.py) about cpython HOT 9 CLOSED

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Looks good to me, and properly skips the large file test on my Linux box. A second iteration may be useful to provide separate options for different resources (cpu/disk/ram), but it's not clearly needed at this time.

Accepted as-is.

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This was accepted ages agon -- what are you waiting for?

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Fred, can you test this on a Linux with > 2Gb files (needs the --have-resources switch; read Trent's comment), or pass it on to someone who can? I can't do more than stare at this, and nothing in my staring hit my eye. Well, Guido may hate the long option name (--have-resources), especially given that even with all those letters <wink>, it's not really self-describing.

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Fred, do something with this or assign it to some other Unix geek?

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This patch adds a test for largefiles (creating, seeking, telling, etc.).
The test skips if there is no largefile support.

There is one further problem. The test basically involves creating a file
greater than 2GB and playing with it. On UN*X systems with sparse files this
is no problem. On Win64 (which I have heard *can* do sparse files, but not in
Python yet), however, >2GB space and a *long* time is required to run the
test. I don't think it is reasonable to turn this on by default... so here is
what I did.

I extended regrtest.py to accept the --have-resources switch. This sets
test_support.use_large_resources, which is checked in test_largefile.py.
By default 'use_large_resources' is false. On Win64, then, by default the
largefile test is skipped but can be run via the --have-resources switch to
regrtest.py or by running the test directly. This seems to me the Right
Thing.

The affected files are:
Lib/test/regrtest.py
Lib/test/test_support.py
Lib/test/test_largefile.py (new)
Lib/test/output/test_largefile (new)

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--have-at-least-2GB-on-hard-drive-and-am-going-for-coffee-<wink>

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Sorry about the delay.
Had to make some small changes to get the old patch to apply.

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