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Re: [cdt-dev] Preparsed Index Setup Questions


hi Tim,

> The project PDOM is the same size, same headers and added, and about the
> same time to re-index whether or not the preparsed index is used.


This sounds like a problem with the IIndexLocationConverter - if the paths
of includes the indexer requests do not align with those contained in the
pre-built index, then you get a situation like a cache miss and the file will
be indexed anyhow. For an external SDK, its likely that you can use
   org.eclipse.cdt.core.index.URIRelativeLocationConverter
initialized with the URI of the logical base of the index content. For example,
"file:/D:/Symbian/9.5/epoc32/include".

Running some quick benchmarks against HEAD, I see improvements like
        helloworld:        20KiB -> 20KiB, 3s -> 1s
        'agenda' user application: 8MiB -> 940KiB, 12s -> 9s

The time improvement is more modest than I expect for the second case. The parsing
(not resolution) phase seems to be taking longer - I'll try to find some time to see
why.

> 1) Only one preinclude is allowed (-include arg) when generating a PDOM.
> I have a fix for that if we want to allow > 1 preinclude, which I don't
> know why we wouldn't.
> 2) Only one source path is allowed (-source arg). I have a partial fix
> for that, adding multiple linked directories to be indexed under the
> dummy project.


The default command-line (ExternalExportProjectProvider) is very simple. You
can provide an alternate implementation with the -pprovider switch, but these
do sound like good enhancements to have - if you're happy to raise a
bugzilla I'll aim to pick these up.

> 3) PDOM generation runs out of memory with too many source files. I can
> log a bug which I can reproduce, but can't provide sources.


I've not seen this - a bugzilla with details such as number of files, heap size
etc.. is a good idea.

thanks,

Andrew

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