News for hackers. Stuff that matters.

A comment on How Discord Scaled Elixir to 5M Concurrent Users. Parent comment

Re:How Discord Scaled Elixir to 5M Concurrent Users by pencilhappen on Tuesday July 11, 2017 @07:19PM (#14748895)
> Parallel Universe's Quasar is basically OTP for Java, so I know logically that Java is basically a superset of Erlang at this point

It's not really a superset. The JVM has a single global heap, whereas BEAM has per-process heaps. Global state is the enemy of concurrency, and the best GC algorithm is one you don't need to run at all. The "several hundred millisecond HTTP response latency and horde (sic) memory" problems you note are in part a result of having a global heap.

[ Parent | on HN ]
Re:How Discord Scaled Elixir to 5M Concurrent Users by agentgt on Wednesday July 12, 2017 @08:54AM (#14752057)
I agree. There is some work to go off heap with Java and supposedly you can get incredibly results. Unfortunately the libraries that seem to help doing this are either proprietary are not very well support or stalled.

Of course I think part of the problem is most people in Java land just don't have the 5m concurrency requirements so it doesn't get the love it probably should.

[ Parent | on HN ]