Request limitation

Open Source Routing Engine
1

Are there any limitations on Graphhopper 8.0 Java?
Let me explain why:

I had set up a Docker machine for batch calculation of distances between two addresses. The machine wasn’t very powerful, but it was sufficient to process all of Italy. Additionally, it was on a different PC, so the requests were made through a VPN with the main PC. However, for various reasons, I cannot install Docker on the final machine, so I chose to use the Java version.

The configuration went well, but I don’t understand why the response to each request has a delay of more than 2 seconds.

I’ve tried numerous configurations, using ch/lm threads, changing the distance_influence, increasing the RAM up to 4GB (2GB should be more than enough), and using smaller regions (e.g., northwest).

But nothing seems to work; it always takes more than 2 seconds to process the request. There seems to be a 2-second delay.

I’ve tried making requests directly in the browser, and it’s much faster. I really don’t understand what could be the issue. Are there any limitations?

Thank you all, hoping that you can help me.

2

No, there is no request limitation for Java but you should ensure that you activate CH. Also ensure that you use an appropriate -Xmx for the JVM.

3

Thanks for the reply

So there must be some issue with resource management…

I start with this string:

java -Xmx3g -Xms3g -D"dw.graphhopper.datareader.file=nord-ovest-latest.osm.pbf" -jar graphhopper-web-8.0.jar server config-example.yml

4

Is the delay caused by your VPN connection? Or does rolling the version back resolve the delay?

5

The problem was when I was working locally. When I used a VPN with a Docker on another machine, it worked well. However, I have now found a way to use a Java VM on another machine, and I no longer have any issues. Probably, 2 cores and 3-4 GB of RAM weren’t sufficient.

6

Glad you got it sorted, and thanks for posting your solution