JDK-7169050 : (se) Selector.select slow on Solaris due to insertion of POLLREMOVE and 0 events
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.nio
  • Affected Version: 6u23
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: solaris_nevada
  • CPU: x86
  • Submitted: 2012-05-15
  • Updated: 2013-04-03
  • Resolved: 2012-06-12
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JDK 7 JDK 8
7u6Fixed 8 b43Fixed
Related Reports
Relates :  
JDK-7173515 - (se) Selector.open fails with OOME on Solaris when unlimited file descriptors
Description
Pls see comments
Comments
EVALUATION We need to change the /dev/poll Selector so that: 1. writes the POLLREMOVE the deregister the fd prior to the final close. 2. change the batch update so that it doesn't insert a POLLREMOVE prior to each update. This can be done by either eliminating batching or by ensuring that the update contains at most one update for a file descriptor. 3. When the interest ops are changed to 0 then we should remove the file descriptor from /dev/poll. We have a prototyped a patch with these changes and this is currently being tested. Results so far are positive. A residual issue that is not addressed in the patches are that a POLLREMOVE will still be written before the final close even if the interest ops are 0 (and thus already deregistrated). This is not an issue with the current /dev/poll driver but would require fixing if the /dev/poll is changed.
17-05-2012