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What's Next Paris: on Do you really get memory?

Do you really get memory?
That's a stupid question, isn't it? Memory is just where you keep things. Nevertheless the majority of of performance problems I have seen were in the end connected to memory issues. In modern computers memory is a complex multi-layered thing affected by the hardware, operating system and the JVM. And considering that it's shared among multiple CPUs we get a lot of classical distributed problems without an actual network anywhere in sight.

You should attend this talk if any of the following questions give you pause:

How slow is memory?
What does volatile really do?
How pagefaults happen and what do they mean?
Why swapfile and Java don't work together well?
Why GC doesn't scale well (so far)?
What good alternatives to Java Memory Model are there?

To answer those questions I'll build a simple CPU model in Java to illustrate some of the concepts and do live simulations for the rest. As a bonus I'll also talk about some improvements in the modern hardware and what it could mean for the next generation JVM.

This session took part at the What's Next Paris. You can view the other 7 podcasts here.

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