http://www.smalltalkconsulting.com/papers/GCPaper/GCTalk%202001.htm see slides 46 & 47 You need to have a tenure event, or a full GC to move the youngStart pointer past all previously allocated objects, thus promoting a previously allocated object from new space into old space. There is btw a primitive I added many years back primitiveForceTenure SystemDictionary>>forceTenure Understanding when and why you would want to use it is another question... On 2010-05-10, at 9:02 AM, Igor Stasenko wrote:
On 10 May 2010 18:33, Alexandre Bergel <alexandre.bergel@inria.fr> wrote:
Hi!
The garbage collection offered by the Pharo VM has two divisions. One for young objects, and another for old objects. I was wondering when a young object become old? I start to have a pretty good idea for human beings, but I am not so sure for Pharo objects. Is it when the object survives its first garbage collection?
I'd say, whenever VM decides to change a youngStart pointer. Its quite sophisticated, and having a lot of quirks & preconditions. But after compaction (either incremental or full), it usually picks a free memory region which will serve as a space for newly created objects. After that, obviously, all objects, which survived GC treated as old ones.
Cheers, Alexandre
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
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