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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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No, I don't think you can assume that. Passivation is about moving data from memory to
a persistent disk cos it hasn't been used in a while, but it doesn't mean it
doesn't need it any more! So, you have to assume that this is data that might be
needed later and hence no loss is allowed. What I mean with this is that with passivation,
data is either in memory or cache store.
So, even if passivation/eviction occurs in a delayed fashion, it doesn't mean that we
evict from memory and we passivate after X time. If eviction/passivation happens in a
delayed fashion, it means that after X time, eviction happens and immediately data is
passivated, hence no loss occurs.
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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