[infinispan-issues] [JBoss JIRA] Commented: (ISPN-663) Eviction with passivation using JdbmCacheStore is 100 times slower in 4.1 vs 4.0

[Trustin Lee (JIRA)]

    [ https://jira.jboss.org/browse/ISPN-663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12554873#action_12554873 ] 

Trustin Lee commented on ISPN-663:
----------------------------------

If a user uses passivation, can I assume that he or she is fine with losing data?  I'm asking this question because there are entries that are in memory but not in CacheStore with passivation enabled.  If so, delayed / scheduled / batched passivation could be done in the core level so that all loaders benefit.  If there is a manual passivation operation, it will have to be done immediately surely since user expects not to lose it.  Is there such manual passivation operation supported in Infinispan?

> Eviction with passivation using JdbmCacheStore is 100 times slower in 4.1 vs 4.0
> --------------------------------------------------------------------------------
>
>                 Key: ISPN-663
>                 URL: https://jira.jboss.org/browse/ISPN-663
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Eviction, Loaders and Stores
>    Affects Versions: 4.1.0.Final
>         Environment: Win32 JRE 1.6.0_21
>            Reporter: Paul Nardone
>            Assignee: Trustin Lee
>             Fix For: 4.2.0.BETA1, 4.2.0.Final
>
>         Attachments: InfinispanPassivationTest.java
>
>
> Eviction with passivation enabled using the JdbmCacheStore appears to be significantly slower in 4.1.0.FINAL vs 4.0.0.FINAL.
> The degredation in performance is so signficant to make it impossible  to use
> The  performance issue seems to due as the JdbmCacheStore synching the filesystem via FileDescriptor.sync() or similar which occurs during every object passivation and each passivation occurs as a new object is added beyond the EvictionMaxEntries capacity.
> The attached test inserts 1000 values into two caches
> Both caches use a JdbmCacheStore and  LRU
> PASSIVATIONLRU10 runs with cache with EvictionMaxEntries  10
> PASSIVATIONLRU1000 runs with cache with EvictionMaxEntries  1000
> 4.1.0.FINAL
> PASSIVATIONLRU10 Time Taken : 51704
> PASSIVATIONLRU1000 Time Taken : 4484
> 4.0.0.FINAL
> PASSIVATIONLRU10 Time Taken : 281
> PASSIVATIONLRU1000 Time Taken : 141
> 4.2.0.ALPHA2
> PASSIVATIONLRU10 Time Taken : 51047
> PASSIVATIONLRU1000 Time Taken : 5156

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