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https://issues.apache.org/jira/browse/SOLR-667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644942#action_12644942
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Shalin Shekhar Mangar commented on SOLR-667:
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I ran it again with a new thread for each cleanup. Time taken for markAndSweep
is printed:
{code}
time=1550 impl=LRUCache nThreads= 1 size=100000 maxKey=120000 gets=2000000
hitRatio=0.835225
MarkAndSweepTime = 138
MarkAndSweepTime = 35
MarkAndSweepTime = 36
MarkAndSweepTime = 39
MarkAndSweepTime = 41
MarkAndSweepTime = 42
MarkAndSweepTime = 42
MarkAndSweepTime = 44
MarkAndSweepTime = 43
MarkAndSweepTime = 43
MarkAndSweepTime = 44
MarkAndSweepTime = 43
MarkAndSweepTime = 43
MarkAndSweepTime = 44
MarkAndSweepTime = 43
MarkAndSweepTime = 44
MarkAndSweepTime = 44
MarkAndSweepTime = 43
time=1378 impl=FastLRUCache nThreads= 1 size=100000 maxKey=120000 gets=2000000
hitRatio=0.8130459999999999
time=3942 impl=LRUCache nThreads= 2 size=100000 maxKey=120000 gets=2000000
hitRatio=0.835045
MarkAndSweepTime = 58
MarkAndSweepTime = 165
MarkAndSweepTime = 32
MarkAndSweepTime = 34
MarkAndSweepTime = 37
MarkAndSweepTime = 37
MarkAndSweepTime = 46
MarkAndSweepTime = 40
MarkAndSweepTime = 61
MarkAndSweepTime = 53
MarkAndSweepTime = 51
MarkAndSweepTime = 44
MarkAndSweepTime = 47
MarkAndSweepTime = 47
MarkAndSweepTime = 48
MarkAndSweepTime = 48
MarkAndSweepTime = 46
time=1062 impl=FastLRUCache nThreads= 2 size=100000 maxKey=120000 gets=2000000
hitRatio=0.8560415
{code}
> Alternate LRUCache implementation
> ---------------------------------
>
> Key: SOLR-667
> URL: https://issues.apache.org/jira/browse/SOLR-667
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.3
> Reporter: Noble Paul
> Assignee: Yonik Seeley
> Fix For: 1.4
>
> Attachments: ConcurrentLRUCache.java, ConcurrentLRUCache.java,
> ConcurrentLRUCache.java, SOLR-667-alternate.patch, SOLR-667-alternate.patch,
> SOLR-667-updates.patch, SOLR-667.patch, SOLR-667.patch, SOLR-667.patch,
> SOLR-667.patch, SOLR-667.patch, SOLR-667.patch, SOLR-667.patch,
> SOLR-667.patch, SOLR-667.patch
>
>
> The only available SolrCache i.e LRUCache is based on _LinkedHashMap_ which
> has _get()_ also synchronized. This can cause severe bottlenecks for faceted
> search. Any alternate implementation which can be faster/better must be
> considered.
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