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https://issues.apache.org/jira/browse/UIMA-4279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor resolved UIMA-4279.
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Resolution: Fixed
> tune space-time tradeoffs for internal array structures in core uima
> --------------------------------------------------------------------
>
> Key: UIMA-4279
> URL: https://issues.apache.org/jira/browse/UIMA-4279
> Project: UIMA
> Issue Type: Improvement
> Components: Core Java Framework
> Affects Versions: 2.7.0SDK
> Reporter: Marshall Schor
> Assignee: Marshall Schor
> Priority: Trivial
> Fix For: 2.7.1SDK
>
>
> Several internal array structures in UIMA expand like array lists by
> doubling, up to some size, usually 2 million entries, and then expand by
> adding that size (e.g., 2 million) instead of doubling.
> The switch-over point for most of these is 2 million entries. Increasing
> this makes (for large allocations > 2 million) for more wasted space, since,
> on average, about 1/2 of the last reallocation may be unused On the other
> hand, having a large allocation size increment means that fewer reallocations
> are needed (each one requires copying the entries from the old into the new,
> usually with System.arraycopy).
> Given the drop in memory cost, increase the reallocation switch-over limit
> for the 2 million entries to 16 million, to rebalance a bit more in favor of
> speed vs memory. Note this has no effect except when the size of these
> internal tables grows beyond 2 million entries.
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