What does “GC--” mean in a java garbage collection log?

Question

We\'ve turned on verbose GC logging to keep track of a known memory leak and got the following entries in the log:

...
3607872.687: [GC 471630K->390767K(4         


        

Answer 1

Yishai said in the comments:

Given the timestamps and memory amounts I would guess it performed a garbage collection but lost available memory (because other objects were created in parallel)