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https://issues.apache.org/jira/browse/DAFFODIL-1447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dave Thompson closed DAFFODIL-1447.
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Verified the specified commit (commit 92de5ff6c75be0558edc3fe767c8d591688f425c)
is included in the latest pull from the incubator-daffodil repository.
Verified the incubator-daffodil sbt test suites execute successfully.
Verified the nightly test schemas compile and save successfully.
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> Performance: Improve performance with VariableMap
> -------------------------------------------------
>
> Key: DAFFODIL-1447
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1447
> Project: Daffodil
> Issue Type: Improvement
> Components: Back End, Front End, Performance
> Affects Versions: 2.0.0
> Reporter: Steve Lawrence
> Priority: Major
> Fix For: 2.7.0
>
>
> The hash lookups associated with finding a variable in the variable are
> relatively expensive, especially when looking up a variable many times.
> Additionally, the purely function data structure is nice, but is slow when
> setting variables because a new map must be created.
> So, we should chang the VariableMap data structure to just be an array of
> stacks, where each index in the array represents a single variable qname, and
> the stack represents the current instance. When a new variable instance is
> created we push onto the stack. When that instance goes out of scope, we pop
> it off. Additionally, DPath should be modified so that variable references
> are just an offset into this array. This should make variable access much
> faster with minimal allocations.
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