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https://issues.apache.org/jira/browse/LUCENE-5951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14253307#comment-14253307
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Michael McCandless commented on LUCENE-5951:
--------------------------------------------
Actually, I run BTRFS on my current dev box. It is a symlink, but spins() gets
through that:
{noformat}
mike@haswell:/$ df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/haswell--vg-root 466G 138G 324G 30% /
mike@haswell:/$ ls -l /dev/mapper/haswell--vg-root
lrwxrwxrwx 1 root root 7 Dec 14 17:08 /dev/mapper/haswell--vg-root -> ../dm-0
mike@haswell:/$ cat /sys/block/dm-0/queue/rotational
0
{noformat}
To verify spins() is working, I just run:
{noformat}
ant test -Dtestcase=TestConcurrentMergeScheduler
-Dtestmethod=testDynamicDefaults -Dtests.verbose=true
-Dtests.directory=MMapDirectory
{noformat}
and then look for the line where CMS logs the "spins" result:
{noformat}
[junit4] 1> CMS 1 [Fri Dec 19 16:36:47 UZT 2014; main]:
initMaxMergesAndThreads spins=false maxThreadCount=3 maxMergeCount=5
{noformat}
> 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,
> LUCENE-5951.patch, 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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