On 10/28/12 9:03 AM, Bennie Kloosteman wrote:
AFAIK Azul is propitiatory and is not fast it makes a huge number of
small memory allocations and they make changes on linux to make i this
work rather than on specialized HW .. What is special though is the lack
of long GC pauses.
That said GCs are getting better the only real issues are
1, GC pauses . Which makes managing system memory eg for DMA / drivers
tricky.
2 . Write performance , most GCs have a card table which halves memory
write performance.
In quite a few cases GC give better performance than malloc ( since
nursery allocations are just a compare / exchange pointer increment with
no concern for fragmentation) and with GCs you can still create and
manage a static buffer pool if you need performance
For places where it matters (e.g. the binarytrees shootout benchmark) we
have an arena type in the standard library that provides bump allocation.
Making memory pools without special language support isn't particularly
safe; the code could incorrectly return an object to a pool and continue
to hold on to it, creating in effect a dangling pointer. You really want
a region system if you want memory pools to have the same safety
guarantees as ordinary use of the garbage collector.
Patrick
_______________________________________________
Rust-dev mailing list
[email protected]
https://mail.mozilla.org/listinfo/rust-dev
