Hello,

It seems that for the cpp back-end, the activity-local object is 
allocated in a thread-local free-list. And the list will be mark and 
sweep. The allocate and GC need lock, so have some synchronous overhead.

However, how does the Java back-end implement activity-local object 
allocation? Does Java back-end also has the GC synchronous overhead 
which may affect scalability?

Thank you very much.

Regards,
-Tetsu

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