Comments (2)
This is an enhancement request, not a defect.
I can see how this would be useful. It's a tricky question though. I have some
ideas on this, I'll think about how best to proceed.
In the meantime, in general, a helpful way to find which types of objects are
using most memory is the command line:
jmap -histo:live <pid of jvm>
Original comment by [email protected]
on 15 Dec 2014 at 3:21
- Changed state: Accepted
- Added labels: Type-Enhancement
- Removed labels: Type-Defect
from cqengine.
Done in CQEngine 2.0:
The size of the collection can roughly be determined by configuring it to use
off-heap or disk persistence, and then calling:
http://cqengine.googlecode.com/svn/cqengine/javadoc/apidocs/com/googlecode/cqeng
ine/persistence/Persistence.html#getBytesUsed()
The size of off-heap or disk indexes can roughly be determined in a similar
way: determine the size of the collection as above, add the index, then
determine bytes used again, and subtract.
Also, for most indexes including on-heap indexes, the number of buckets and the
number of objects in each bucket can be determined via the following API which
most indexes now implement:
http://cqengine.googlecode.com/svn/cqengine/javadoc/apidocs/com/googlecode/cqeng
ine/index/support/KeyStatisticsIndex.html
Original comment by [email protected]
on 20 Apr 2015 at 8:32
- Changed state: Done
from cqengine.
Related Issues (20)
- Auto-generate attributes HOT 2
- FilteringIterator.hasNext advances iterator every time it is called. HOT 6
- Recommendation on ID indexes HOT 1
- And.calcHashCode being performance Bottlneck HOT 11
- Set.add semantics is not perfect. HOT 4
- Set remove() and removeAll() doesn't follow substitutability principle. HOT 4
- Add listeners (observers) to IndexedCollection HOT 5
- Add support for query "dialects" like SQL HOT 2
- Documentation for selective READ_COMMITTED transaction isolation using RW lock HOT 2
- Support lock-free READ_COMMITTED transaction isolation via multiple buffering HOT 2
- DeduplicationStrategy.MATERIALIZE broken in 1.2.4 HOT 1
- Modify Or/And to allow only one child. HOT 2
- Comparing two objects? HOT 1
- ObjectLockingIndexedCollection's StripedLock does not handle negative hashcodes HOT 1
- Multiversion concurrency control(MVCC) should be implemented for transaction isolation HOT 2
- Query CONSISTENTLY slower with the addition of NavigableIndex HOT 1
- Attribute#getValues to return Iterable HOT 1
- deduplication not return duplicate objects from the collection HOT 3
- IllegalArgumentException when ResultSet.getMergeCost() changes during query HOT 3
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