Per,
Thank your for responding. We are also doing the HTTP requests, but the
performance is killing us. So just a quick update on what I have found
out so far:
time GET 'http://localhost:5000/viaroute?...'
takes about 500 ms on my system.
time ./simpleclient --sharedmemory
takes about 44 ms with all the default options in the code turned on
takes about 22 ms with all the options turned off
And these numbers are based on still returning json output and parsing that.
So if it were possible to turn simpleclient into object with a few
simple options we could get something close to the performance
improvement above.
And if we can untangle the json encoding and parse and just pass back
raw data we would probably see some additional improvement over those
numbers.
This seems like a worthy path to follow, hence my request for some help
or pointers untangling json encoding and parsing.
Thanks,
-Steve
On 11/7/2014 10:41 AM, Per Lindberg wrote:
I guess that was me. We also would love to have a single
sharable object file (.dll and .so) with a documented API.
All we need is travel time from A to B. We currently do
gazillions of HTTP calls to a separate process, so a more
direct call would be wonderful.
Keep me posted if you see any progress in this.
Cheers,
Per Lindberg
Facility labs
On 2014-11-07 16:13, Stephen Woodbridge wrote:
Hi,
I seem to remember a while back that there was a discussion about the
possibility to embed the OSRM routing engine at the code level rather
than doing HTTP requests to a server.
I now find myself in a position that this would be desirable to do. I
have a small coverage area like a city, but I'm getting killed by the
overhead of formatting requests as strings, making a socket connection
to osrm-routed, parsing the responses, etc. Making local requests my
server this is taking 4-500 ms per request.
Basically, I'm doing viaroute requests with 2-100 via points. 99% of the
time all I need to know is the travel time.
Since I'm developing in C++, I thought it might be easy and much faster
to instantiate the routing engine and then have a simple interface where
I can pass a container of points and get back the travel time for that
route and/or the path coordinates. But I could live without the
coordinates if I had to.
Has anyone done this already? Can you share?
I have started digging through the source to see if I can do this, but
working my way in from osrm-routed or Tools/simpleclient.cpp the code is
very entangled with all the http request/response stuff that I would
ideally like to avoid. So far the most promising path looks like using
some variant of the simpleclient, but its not obvious if or how to
untangle all the json stuff and simply return a struct or class to the
caller without that. I spent most of yesterday, digging through this and
made a lot of progress just understanding simpleclient and getting ti to
compile and work and get it to actual return results using a shared
memory connection.
A little help in this direction would be appreciated.
Thanks,
-Steve
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