[OSM-dev] OSM API Performance (Was: OSM Database Infrastructure)

[SteveC]

On 20 Jan 2008, at 12:30, Robert (Jamie) Munro wrote:

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> Tom Hughes wrote:
> | In message <20080119234103.GA1098 at alta.metacarta.com>
> |           Christopher Schmidt <crschmidt at metacarta.com> wrote:
> |
> |> In the past, I think that we had talked about the fact that the / 
> map
> |> request is resource intensive compared to most of the other ruby  
> calls,
> |> and that some of it is memory + CPU intensive and might be a  
> small chunk
> |> worth improving performance in. Given that sometimes the requests  
> are
> |> returning reasonably quickly, this may be premature optimization  
> if al
> |> lthe wait time is waiting for an available rails daemon.
> |
> | It is not especially CPU intensive. It is I/O and memory intensive
> | but there isn't much we can do about that (well there is, but it
> | probably isn't an answer people will want to hear).
>
> I guess it is only the map call that is a problem. If that is the  
> case,
> as this is a read-only call that needs not authentication or other  
> rails
> related input, could we rewrite it in a more efficient language that  
> is
> capable of streaming the data directly and use apache rewrites or
> similar to serve them?
>
> I think we should also offer 2 versions of the map query - the one  
> that
> we already have, that completes all the ways outside the box, and
> another that just indicates which ways are incomplete, but takes less

er, thats what it used to do

>
> resources to run, and therefore runs quicker. Ideally, there would  
> also
> be an option to add one node for any ways that go off the east or  
> south
> of the box so that if you download 2 adjoining areas, you will get all
> the data once and once only.
>
> Robert (Jamie) Munro
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have fun,

SteveC | steve at asklater.com | http://www.asklater.com/steve/