RFR: 7133138 Improve io performance around timezone lookups
sean.coffey at oracle.com
Tue Feb 21 18:19:38 UTC 2012
I've worked with Masayoshi on this issue. Hoping to push to JDK8 and
backport to 7u and a jdk6 once baked for a while.
Some windows boxes were showing performance issues when attempting to
iterate through all available timezones available in the JRE. Changes
made here should reduce the amount of file stat calls made on
jre/lib/zi/* files. Tweaks are made to the alias table also to reduce
number of aliases that require lookup.
All TZ regression tests run without issue. I've seen a 20-30% speed up
on iteration of timezones on windows as a result. Unix doesn't appear to
suffer as badly from such a file IO hit.
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