Integrated: 8294437: java/nio/channels/FileChannel tests slow on Windows

[Daniel Jeliński]

On Wed, 28 Sep 2022 10:58:43 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> Please review this test-only change that improves the execution speed of a few FileChannel tests:
> - Transfer2GPlus, Transfer4GBFile, and TransferTo6GBFile were modified to use sparse files. Their speed is now consistent across platforms, provided that the platform / filesystem supports sparse files.
> - LargeMapTest was rewritten to use sparse files, and to more precisely target the issue it was written to detect. In my tests it still crashed with EXCEPTION_ACCESS_VIOLATION when JDK-8286637 was reverted.
> - MapTest: repetition was removed from `testForce` method; I'm not sure what issues it was supposed to catch, but at far as I can tell, it was only triggering timeouts, see [JDK-8289526](https://bugs.openjdk.org/browse/JDK-8289526), [JDK-8224480](https://bugs.openjdk.org/browse/JDK-8224480)

This pull request has now been integrated.

Changeset: a4f2078b
Author:    Daniel Jeliński <djelinski at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a4f2078bd60d06795099c52ca8d437a8128eb8f6
Stats:     462 lines in 6 files changed: 180 ins; 105 del; 177 mod

8294437: java/nio/channels/FileChannel tests slow on Windows

Reviewed-by: alanb, bpb

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PR: https://git.openjdk.org/jdk/pull/10464