Memory management in Flink

[Emmanuel]

Hello,
In Storm, when running a new topology, a new JVM is started and this takes some 
memory.
In my use case, I may need to run many different topologies.
How does it work in Flink? Is the Flink run command spinning a new JVM each 
time?If I run multiple topologies it seems like the additional processes take a 
lot less memory, but it's not clear to me how that happens.
Can anyone comment on hwo memory is managed in Flink?
Thanks