[infinispan-issues] [JBoss JIRA] Commented: (ISPN-663) Eviction with passivation using JdbmCacheStore is 100 times slower in 4.1 vs 4.0
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https://jira.jboss.org/browse/ISPN-663?page=com.atlassian.jira.plugin.sys...
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Galder Zamarreño commented on ISPN-663:
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Re 1) The reason we need to load first from cache loader is generally to be able to return
previous value, particularly in cold caches. Now, we can't just store and load cos
we'd lose the previous value. We might be able to optimize this further, I'll
start a post in dev forum.
Re 2) If you can find any other alternative impls, let us know! It's a while we
haven't looked around, but it seemed to be best around with a decent license.
Now, I suppose the difference between his previous measurements and now is the fact that
loading happens still within the same thread. Whereas the eviction thread would have done
it itself and so it wouldn't have impacted the main thread? Can you confirm this
Trustin?
Eviction with passivation using JdbmCacheStore is 100 times slower in
4.1 vs 4.0
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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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