[teiid-issues] [JBoss JIRA] (TEIID-1750) Memory handling improvements
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https://issues.jboss.org/browse/TEIID-1750?page=com.atlassian.jira.plugin...
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Steven Hawkins commented on TEIID-1750:
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Reducing the memory overhead of ManagedBatches, using variable sized batches, switching to
a concurrent LRFU, etc. In initial testing so little have changed in the single threaded
all memory case (depending on how trivial the data set is there can be a small degredation
to a small improvement). Minor additional overhead is to be expected due to maintaining
the cache ordering.
In multi-threaded testing even with small amounts of data (2 threads creating/manipulating
2 256k row tables with 128byte rows) both the all memory and a constrained buffer memory
test show marked improvement of 30% or more.
Memory handling improvements
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Key: TEIID-1750
URL: https://issues.jboss.org/browse/TEIID-1750
Project: Teiid
Issue Type: Quality Risk
Components: Query Engine
Affects Versions: 7.0
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.6
The buffermanager will create softreferences for batches that prefer memory, but does not
track the memory as held once the value has been passivated.
Also small lobs, such as xml values created via sqlxml, should be inlined into results
for greater performance - and so that they can be paged out by the buffermanager rather
than being held by a lobmanager.
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