really good talk about the Hotspot VM

[deadalnix via Digitalmars-d]

On Thursday, 16 July 2015 at 17:30:06 UTC, Benjamin Thaut wrote:
> This talk is really good and contains a lot of usefull 
> information very densly packed:
> https://www.youtube.com/watch?v=vzzABBxo44g
>
> The speaker has 30 years of experience working on javas hotspot 
> vm and shares his opinions on what you should do. My takeaways 
> from this talk are:
>
> GC:
> -You want a fully percise GC (e.g. know _all_ pointers even the 
> ones on the stack), the benenift outweights the cost for 
> tracking pointers.
> -You do not want to pin allocations in the gc heap as it is to 
> restrictive for your gc implementation.
> -GC safepoints worked out really well.
>

Because in Java, everything is in the VM and you can play all 
kind of trick that wouldn't work for us.

> TLS:
> To get fast thread local storage, align the start of the stack 
> so you can chop of a few bits of the stack pointer to get to 
> the TLS-section. We might be able to use this on platforms with 
> slow TLS?
>

That is beautiful ! But does not quite work with Fibers. Still, I 
want to believe, there is most likely something here that is 
worth looking into.