Update: Leemba on Terracotta

Just a quick update to this post: it’s pretty awesome.

I’ve spent some considerable time adjusting Leemba for Terracotta, mostly running down missing locks and various performance tweaks. With about 20 services per second, I started at a load average of over 25. But now the load is negligible. :-)

Of course, the culprit was calling out to the native fping. I was a bit surprised, I figured Linux would cache fping and it wouldn’t be quite so terrible. So now there’s now a preference to use Java’s isReachable() instead.

I’m happy with performance for now. It’s down to no more than 20% cpu utilization between two clients and two Terracotta servers. That could be vastly improved by working to use multiple schedulers, but for now I’m waiting to see what the next release will do for performance.