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Bug 255757

Summary:	Use NIO2 Notifier by default
Product:	platform	Reporter:	Jaroslav Havlin <jhavlin>
Component:	Filesystems	Assignee:	Jaroslav Havlin <jhavlin>
Status:	NEW ---
Severity:	normal
Priority:	P3
Version:	8.2
Hardware:	All
OS:	All
Issue Type:	TASK	Exception Reporter:
Attachments:	Working draft of patch First measurement results

Description Jaroslav Havlin 2015-10-07 08:55:51 UTC

Currently, native file system notifiers are used by default on major platforms.
We might use NIO2 notifier by default and possibly, if it works correctly,
remove native notifiers completely in some future release.
(Some system property for enforcing native notifier should be provided.)

Comment 1 Jaroslav Havlin 2015-10-08 13:00:10 UTC

Notes:

 - NIO2 WatchService was originally used in Solaris notifier by Egor Ushakov
   (masterfs.solaris), which was then generalized and renamed to masterfs.nio2.

 - NIO2 WatchService implementation for Mac OS X uses inefficient polling.
   See https://bugs.openjdk.java.net/browse/JDK-7133447.

 - Performance on Windows and Linux should be checked and measured and compared
   to native implementations.

Comment 2 Jaroslav Havlin 2015-10-23 15:31:21 UTC

Created attachment 156938 [details]
Working draft of patch

Comment 3 Jaroslav Havlin 2015-10-23 15:32:25 UTC

Created attachment 156939 [details]
First measurement results