[Python-Dev] Python 3 optimizations continued...

[Mark Shannon]

Cesare Di Mauro wrote:
> 2011/9/1 Ned Batchelder <ned at nedbatchelder.com 
> <mailto:ned at nedbatchelder.com>>
> 
>     When the switchover to the new instruction format happens, what
>     happens to sys.settrace() tracing?  Will it report the same sequence
>     of line numbers?  For a small but important class of program
>     executions, this is more important than speed.
> 
>      --Ned
> 
> 
> A simple solution: when tracing is enabled, the new instruction format 
> will never be executed (and information tracking disabled as well).
> 
What happens if tracing is enabled *during* the execution of the new 
instruction format?
Some sort of deoptimisation will be required in order to recover the 
correct VM state.

Cheers,
Mark.

> Regards,
> Cesare
> 
> 
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