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From Jan Lehnardt <...@apache.org>
Subject Re: Question on view server design...
Date Thu, 23 Oct 2008 16:42:09 GMT

On Oct 23, 2008, at 18:35, kowsik wrote:

> I was seeing the couchjs process getting pegged and I was looking  
> into further.
>
> 1. The protocol uses "add_fun" command to add all the map functions to
> the view server so that they are compiled and ready to go.
> 2. Then "map_doc" is invoked with each document to return the results
> of the various emit's
> 3. They "reduce" and "rereduce" are invoked depending on the query.
>
> It's #3 that I'm interested in. The "reduce" command currently passes
> in the reduce function string from the design view each time it's
> invoked. This means the reduce function is first eval'd and then
> executed. I'm wondering if it's possible to rename "add_fun" to
> "add_map_fun" and introduce a new "add_reduce_fun" and then reference
> functions by index? Seems like it might speed things up quite a bit.

Have you measured the reduce function compilation to be a bottleneck?
I'd guess (see, haven't measured either:-) that erlang-term to JSON &  
JSON
parsing take up significantly more time.

Cheers
Jan
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