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https://issues.apache.org/jira/browse/DAFFODIL-1444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855710#comment-16855710
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Michael Beckerle commented on DAFFODIL-1444:
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As of this hash 6aacf32fa53cb5618da74bd24f05b1e2bb5238e2 simple type objects
are no longer being copied in DSOM. Turns out their need for backpointers was
limited and could be removed with less complexity. That leaves the challenging
backpointers as those from groupDefs back to group refs., element decls to
element refs, and complexType defs to elements using named complex types.
> Performance - schema compilation
> --------------------------------
>
> Key: DAFFODIL-1444
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1444
> Project: Daffodil
> Issue Type: Improvement
> Components: Front End, Middle "End", Performance
> Reporter: Michael Beckerle
> Assignee: Michael Beckerle
> Priority: Major
> Fix For: 2.4.0
>
>
> Large DFDL schemas are very slow to compile.
> We could focus on speeding this up, and should get some low-hanging fruit
> here.
> But ultimately, a really large DFDL schema needs to be compiled in pieces.
> (DEBATABLE - focus should FIRST be on speeding up and reducing the massive
> copying that goes on. Separate compilation is a harder issue that we can
> defer.)
> This means we need to be able to reload a compiled schema just to restore
> it's parsers/unparsers and associated runtime data structures to memory so
> that another schema that depends on it can then be compiled.
> DFDL schema compilation needs to be understood in order to decompose a schema
> into separately compilable units. THere's no point in trying to compile a
> schema layer by layer - a DFDL schema containing all type definitions, for
> example, doesn't compile to anything. There have to be top level elements in
> order for DFDL schema compilation to do anything.
> So given a large data format with many top-level element types, we need the
> compiler to recognize element references to pre-compiled top-level elements,
> and avoid recompiling new instances of them if the surrounding environment is
> the same. That is, surrounding default format specification is the same.
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