Re: [cdt-dev] Preparsed Index Setup Questions

[Andrew.Ferguson@xxxxxxxxxxx]

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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