[pgrouting-dev] [OSRM-talk] Making progress on dumping pgRouting tables to OSRM
Stephen Woodbridge
woodbri at swoodbridge.com
Thu Nov 14 18:25:13 PST 2013
Antonio,
Thank you for the feedback on CURL, and the other references.
I kind of look at the development path as get it working then figure out
how to make it fast. Get it working allows use to validate the approach,
but having feedback like this is great so we can avoid the same issues
others have already discovered.
I'll have to read up on the apache httpclient stuff. I have never seen
that before.
Did you write a wrapper for your requests to OSRM via httpclient? Can
you share that?
Thanks,
-Steve
On 11/13/2013 4:03 PM, Antonio Moratilla Ocaña wrote:
> Hi Stephen
>
> Only two notes that may help you with your plan:
> I've been working on using OSRM from a web service, and i've learned
> OSRM doesn't perform so good when queried with curl (Ok, it's not OSRM
> problem, but curl: it need to setup a route and connection to the
> server, and it takes time, and usually you don't go concurrent here). In
> my problem, i've been using apache commons httpclient in a concurrent
> fashion (http://hc.apache.org/httpcomponents-client-4.3.x/index.html ,
> http://hc.apache.org/httpcomponents-client-4.3.x/httpclient/examples/org/apache/http/examples/client/ClientMultiThreadedExecution.java),
> so connections didn't get released: I was able to reach up to 700
> request por second to my test server, but when used with curl (called
> from java), I couldn't go above 20 request per second.
>
> On the distance matrix topic, I remember Dennis talking about it some
> time ago, and, if i'm correct, he said he had implemented a really
> efficient method for matrix calculation using some clever ideas with
> OSRM internal data representation. He said that code was not open source
> (maybe some project/contract source code?. Later on, he said he had
> matrix calculation on target to be included on OSRM soon (maybe another
> source code version)
> https://github.com/DennisOSRM/Project-OSRM/issues/544, so it would be
> great if that feature could be added. You can also try Klopt
> (https://code.google.com/p/klopt/wiki/introduction ,
> https://github.com/keesklopt/matrix)
>
>
> Good luck!!!
>
>
>
> Antonio Moratilla Ocaña - antonio.moratilla at uah.es
> <mailto:antonio.moratilla at uah.es> - Despacho N334
>
> Profesor del Dpto. Ciencias de la Computación - http://www.cc.uah.es
> Escuela Politécnica - Informática - http://www.etsii.uah.es
> Universidad de Alcalá - http://www.uah.es
>
>
> 2013/11/13 Stephen Woodbridge <woodbri at swoodbridge.com
> <mailto:woodbri at swoodbridge.com>>
>
> On 11/13/2013 12:27 PM, Emil Tin wrote:
>
>
> Hi Stephen, Sound like very interesting work, conencting pgRouting
> and OSRM. I'm afraid I can't help you with your current problem, but
> I'm sure Dennis can.
>
> Emil
>
>
> Hi Emil, Dennis,
>
> Sorry, cross-posted to pgRouting-dev
>
> So this is kind of my rough plan. I have looked into how to do the
> various pieces and now it is just a matter of find some time to do
> the code and testing.
>
> 1. build a pgr2osrm tool that will dump a pgRouting topology into an
> OSRM intermediate file that can be built with osrm-prepare. This is
> the piece that I'm working on at the moment.
>
> 2. setup a local osrm-routed (should be trivial)
>
> 3. code postgresql stored procedures to talk to osrm-routed using
> libcurl
>
> 4. write stored procedures like:
> point = osrm_locate(point)
> point = osrm_nearest(point)
>
> jsontext = osrm_viaroute(point[], alt, instruction, zoom)
> status = osrm_getRouteStatus(jsontext);
> polyline = osrm_getRouteGeometry(__jsontext, alt)
> instructions[] = osrm_getRouteInstructions(__jsontext, alt)
>
> distancematrix[][] = osrm_dmatrix(points[])
> distancerow[] = osrm_one2many(point, points[]
>
> To support this, it would be great if Dennis had time to add two
> methods to osrm-routed like:
>
> http://server:5000/dmatrix?__lat=
> <http://server:5000/dmatrix?lat=><lat>&lon=<lon>&...
> http://server:5000/one2many?__slat=
> <http://server:5000/one2many?slat=><start_lat>&slon=<start___lon>&lat=<lat>&lon=<lon>&...
>
> where the list of points are the arguments. And if the we supply say
> 10 point, then we get back a 10 x 10 matrix. I can simulate this by
> making multiple calls to the server and trying to manage all the
> hints, but it would be far more efficient to just pass the array of
> points and let the server optimize caching internally. This would
> also decrease the number of requests to the server and the overall
> processing time, improving overall performance. Obviously you might
> not want this turned on on your public server, so maybe it is a
> compile time option, but clearly doing this efficiently on a local
> server would be ideal.
>
> We have two major use cases for the distance matrix functionality.
>
> 1. TSP solutions for route optimization
>
> 2. We have new Vehicle Routing Problem (VRP) solver that needs to
> create large distance matrices for example doing single depot,
> multiple vehicle package delivery and pickup. In this case we need
> to compute the distance matrix between all the pickup, delivery and
> depot locations.
>
> All this code will get packaged up in the pgRouting project, but I
> would like to OSRM routed changes to stay in your repository.
>
> We also have a lot of users that are using OSM data with pgRouting
> so building closer ties with you makes sense to better service our
> joint users.
>
> The other thing that got me thinking about this is that I was
> playing with the Google Gmaps API, and it exposes similar
> functionality. I thought it would be great if some project could
> come up with an OpenSource replacement for the Gmaps API, but a
> gating item would be to provide the server tools to support that and
> this would be one of the key pieces.
>
> Right now this is all getting done without funding based on my
> ability to work on it between contract work. Any funding from users
> is always appreciated and would help accelerate my progress.
>
> So that is the idea and my plan :)
>
> -Steve
>
>
> On 13 Nov 2013, at 18:04 , Stephen Woodbridge
> <woodbri at swoodbridge.com <mailto:woodbri at swoodbridge.com>> wrote:
>
> Hi Dennis, Emil,
>
> I have made some progress reverse engineering the current file
> formats and have been able to successfully extract a pgRouting
> topology into the "current" OSRM normalized data files and run
> osrm-prepare on that.
>
> That said, I have not tried to run routes on this which I
> will do
> at some point.
>
> I am still not clear on how restrictions are defined. The only
> description that I can find is the out dated description in:
>
> https://github.com/DennisOSRM/__Project-OSRM/wiki/OSRM-__normalized-file-format
> <https://github.com/DennisOSRM/Project-OSRM/wiki/OSRM-normalized-file-format>
>
>
>
> Can someone please help me with the restrictions definition:
>
>
> If I have the following graph:
>
> nodes: a, b, c, d edges: ab, bc, db
>
> a----b-----c | | d
>
> ab, bc, and db are all two way and there is no right turn
> from db
> to bc
>
> Then, should the restriction as defined in the file be:
>
> b, d, c, forbidden, 7F 00 00
>
> where:
>
> b is the via-node d is the from-node c is the to-node
>
> and the records should then be sorted by edge_id of
> EDGE[via-node,
> to-node].
>
> Is this correct?
>
> I'm happy to create an updated reference page for the normalized
> file format once I get this all sortted out and working.
>
> Thanks, -Steve
>
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