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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-5951) Detect when index is on SSD and set dynamic defaults
Date Wed, 17 Dec 2014 16:14:14 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-5951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-5951:
---------------------------------------
    Attachment: LUCENE-5951.patch

New patch, renaming to "spins", and also unwrapping FileSwitchDir, and returning "false" for
RAMDirectory.

> Detect when index is on SSD and set dynamic defaults
> ----------------------------------------------------
>
>                 Key: LUCENE-5951
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5951
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>         Attachments: LUCENE-5951.patch, LUCENE-5951.patch, LUCENE-5951.patch
>
>
> E.g. ConcurrentMergeScheduler should default maxMergeThreads to 3 if it's on SSD and
1 if it's on spinning disks.
> I think the new NIO2 APIs can let us figure out which device we are mounted on, and from
there maybe we can do os-specific stuff e.g. look at  /sys/block/dev/queue/rotational to see
if it's spinning storage or not ...



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