spray-http: Potential memory leak

[keynmol]

Prologue: I've been load testing our app with Apache Bench and noticed that sometimes same test would stop for a few seconds and then continue, other time the throughput was pretty much exactly what I expected from Spray. It felt random and annoying as I want to guarantee median response time within acceptable limits.

Spent ages investigating locks in all the libraries the project is using, but I seem to have tracked it down to random and long GC pauses. So I made a reproducible (I hope) example - it's very simple, really, so I guess I'm doing something exceptionally stupid.

Full example is here: https://github.com/keynmol/spray-test

The problem is that without sending any requests to the server the memory consumption keeps growing:

And the top heap histogram looks like this:

char[] and byte[] were visibly growing while I was taking the screenshot.

Any help would be appreciated, cheers.

[keynmol]

While I was taking a shower, it kept on:

[jason-ni]

Not sure my case is the same with you. I have a Spray-can reverse proxy service and observed it has memory leaks. In my case, it's the akka memory leaks: akka/akka#19216
And in my test case, there's heavy load of the akka system.