I am using the same setup (solrconfig.xml and schema.xml) as stated in my
prior message:
http://lucene.472066.n3.nabble.com/DirectSolrSpellChecker-vastly-varying-spellcheck-QTime-times-tt4057176.html#a4057389
I am using SOLR 4.2.1 . Just wanted to report something wierd that I am
seeing and would like to find out if anyone else is seeing this behavior.  
Since I don't understand the details of what is happening, I'd like to know
why the change in behavior and if we can do anything to get better QTime
upfront?

I see a change in behavior when running queries against the server due to
which the QTime also changes.

QUERY:
?spellcheck=true
&spellcheck.q=cucoo's+nest
&df=spell
&fq=.... Its the same every time and I believe moot.

Here is what I have to do:
1.  Run the query.
2.  Run the same query with spellcheck=false
3.  Run the original query (spellcheck=true)

QTime from each of the above stages:
1.  40ms (multiple runs with spellcheck=true.)
2.  10ms (spellcheck = false is run just once)
3.  20ms (after changing back to spellcheck=true again and running multiple
times.)

Cache details at each of the above times:
1.      filterCache

        class:
            org.apache.solr.search.FastLRUCache

        version:
            1.0

        description:
            Concurrent LRU Cache(maxSize=1024, initialSize=512, minSize=921,
acceptableSize=972, cleanupThread=false, autowarmCount=128,
regenerator=org.apache.solr.search.SolrIndexSearcher$2@7ce3d64e)

        src:
            $URL:
https:/?/?svn.apache.org/?repos/?asf/?lucene/?dev/?branches/?lucene_solr_4_2/?solr/?core/?src/?java/?org/?apache/?solr/?search/?FastLRUCache.java
$

        stats:

            lookups:
                Was: 30, Now: 35, Delta: 5

            hits:
                Was: 25, Now: 30, Delta: 5

            hitratio:
                Was: 0.83, Now: 0.85

            inserts:
                5

            evictions:
                0

            size:
                5

            warmupTime:
                0

            cumulative_lookups:
                Was: 30, Now: 35, Delta: 5

            cumulative_hits:
                Was: 25, Now: 30, Delta: 5

            cumulative_hitratio:
                Was: 0.83, Now: 0.85

            cumulative_inserts:
                5

            cumulative_evictions:
                0

    queryResultCache

        class:
            org.apache.solr.search.FastLRUCache

        version:
            1.0

        description:
            Concurrent LRU Cache(maxSize=40960, initialSize=10240,
minSize=36864, acceptableSize=38912, cleanupThread=false,
autowarmCount=2560,
regenerator=org.apache.solr.search.SolrIndexSearcher$3@520adaf0)

        src:
            $URL:
https:/?/?svn.apache.org/?repos/?asf/?lucene/?dev/?branches/?lucene_solr_4_2/?solr/?core/?src/?java/?org/?apache/?solr/?search/?FastLRUCache.java
$

        stats:

            lookups:
                Was: 8, Now: 10, Delta: 2

            hits:
                Was: 3, Now: 4, Delta: 1

            hitratio:
                Was: 0.37, Now: 0.40

            inserts:
                Was: 5, Now: 6, Delta: 1

            evictions:
                0

            size:
                Was: 6, Now: 7, Delta: 1

            warmupTime:
                0

            cumulative_lookups:
                Was: 8, Now: 10, Delta: 2

            cumulative_hits:
                Was: 3, Now: 4, Delta: 1

            cumulative_hitratio:
                Was: 0.37, Now: 0.40

            cumulative_inserts:
                Was: 5, Now: 6, Delta: 1

            cumulative_evictions:
                0

    CACHE 2
    CORE
    HIGHLIGHTING
    OTHER
    QUERYHANDLER 3
    UPDATEHANDLER
    Watch Changes
    Refresh Values

2.      filterCache

        class:
            org.apache.solr.search.FastLRUCache

        version:
            1.0

        description:
            Concurrent LRU Cache(maxSize=1024, initialSize=512, minSize=921,
acceptableSize=972, cleanupThread=false, autowarmCount=128,
regenerator=org.apache.solr.search.SolrIndexSearcher$2@7ce3d64e)

        src:
            $URL:
https:/?/?svn.apache.org/?repos/?asf/?lucene/?dev/?branches/?lucene_solr_4_2/?solr/?core/?src/?java/?org/?apache/?solr/?search/?FastLRUCache.java
$

        stats:

            lookups:
                Was: 35, Now: 40, Delta: 5

            hits:
                Was: 30, Now: 35, Delta: 5

            hitratio:
                Was: 0.85, Now: 0.87

            inserts:
                5

            evictions:
                0

            size:
                5

            warmupTime:
                0

            cumulative_lookups:
                Was: 35, Now: 40, Delta: 5

            cumulative_hits:
                Was: 30, Now: 35, Delta: 5

            cumulative_hitratio:
                Was: 0.85, Now: 0.87

            cumulative_inserts:
                5

            cumulative_evictions:
                0

    queryResultCache

        class:
            org.apache.solr.search.FastLRUCache

        version:
            1.0

        description:
            Concurrent LRU Cache(maxSize=40960, initialSize=10240,
minSize=36864, acceptableSize=38912, cleanupThread=false,
autowarmCount=2560,
regenerator=org.apache.solr.search.SolrIndexSearcher$3@520adaf0)

        src:
            $URL:
https:/?/?svn.apache.org/?repos/?asf/?lucene/?dev/?branches/?lucene_solr_4_2/?solr/?core/?src/?java/?org/?apache/?solr/?search/?FastLRUCache.java
$

        stats:

            lookups:
                Was: 10, Now: 11, Delta: 1

            hits:
                4

            hitratio:
                Was: 0.40, Now: 0.36

            inserts:
                Was: 6, Now: 7, Delta: 1

            evictions:
                0

            size:
                Was: 7, Now: 8, Delta: 1

            warmupTime:
                0

            cumulative_lookups:
                Was: 10, Now: 11, Delta: 1

            cumulative_hits:
                4

            cumulative_hitratio:
                Was: 0.40, Now: 0.36

            cumulative_inserts:
                Was: 6, Now: 7, Delta: 1

            cumulative_evictions:
                0

    CACHE 2
    CORE
    HIGHLIGHTING
    OTHER
    QUERYHANDLER 3
    UPDATEHANDLER
    Watch Changes
    Refresh Values

3.   filterCache

    class:
        org.apache.solr.search.FastLRUCache

    version:
        1.0

    description:
        Concurrent LRU Cache(maxSize=1024, initialSize=512, minSize=921,
acceptableSize=972, cleanupThread=false, autowarmCount=128,
regenerator=org.apache.solr.search.SolrIndexSearcher$2@7ce3d64e)

    src:
        $URL:
https:/?/?svn.apache.org/?repos/?asf/?lucene/?dev/?branches/?lucene_solr_4_2/?solr/?core/?src/?java/?org/?apache/?solr/?search/?FastLRUCache.java
$

    stats:

        lookups:
            40

        hits:
            35

        hitratio:
            0.87

        inserts:
            5

        evictions:
            0

        size:
            5

        warmupTime:
            0

        cumulative_lookups:
            40

        cumulative_hits:
            35

        cumulative_hitratio:
            0.87

        cumulative_inserts:
            5

        cumulative_evictions:
            0

queryResultCache

    class:
        org.apache.solr.search.FastLRUCache

    version:
        1.0

    description:
        Concurrent LRU Cache(maxSize=40960, initialSize=10240,
minSize=36864, acceptableSize=38912, cleanupThread=false,
autowarmCount=2560,
regenerator=org.apache.solr.search.SolrIndexSearcher$3@520adaf0)

    src:
        $URL:
https:/?/?svn.apache.org/?repos/?asf/?lucene/?dev/?branches/?lucene_solr_4_2/?solr/?core/?src/?java/?org/?apache/?solr/?search/?FastLRUCache.java
$

    stats:

        lookups:
            Was: 13, Now: 15, Delta: 2

        hits:
            Was: 6, Now: 8, Delta: 2

        hitratio:
            Was: 0.46, Now: 0.53

        inserts:
            7

        evictions:
            0

        size:
            8

        warmupTime:
            0

        cumulative_lookups:
            Was: 13, Now: 15, Delta: 2

        cumulative_hits:
            Was: 6, Now: 8, Delta: 2

        cumulative_hitratio:
            Was: 0.46, Now: 0.53

        cumulative_inserts:
            7

        cumulative_evictions:
            0

Thanks.
-- Sandeep




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