I notice that when I submit HTTP requests to the graphhopper server I am able to get 2000 a second using a HTTPConnectionPool and multiprocessing in python. However, if I use the exact same code but connect to the OSRM server for some reason the requests per second become super slow (perhaps 10 a second):

conn_pool = HTTPConnectionPool(host='localhost', port=5000, maxsize=cpu_count())

def ReqOsrm(data):
    url, qid = data
    try:
        response = conn_pool.request('GET', url)
        json_geocode = json.loads(response.data.decode('utf-8'))
        ...
# Run:
url_routes = CreateUrls(routes_csv)
pool = Pool(cpu_count())
calc_routes = pool.map(ReqOsrm, url_routes)

I'm not too sure why this may be. If I don't use a connectionpool then I run out of ports as it's very fast and creates a new TCP connection for each request.

This leads me to believe it is something to do with the server-routing.exe