On Fri, Jun 21, 2002 at 06:22:40PM -0400, Melvin Smith wrote: > At 10:22 PM 6/21/2002 +0200, Jerome Vouillon wrote: > >Ok. Then, you should do the converse to what you are mentionning in > >your patch: instead of inlining a context in the interpreter structure > >(Parrot_Interp), you should add a field in Parrot_Context containing a > >pointer to a shared Parrot_Interp structure. (And the bytecode > >interpreter should use Parrot_Context wherever it uses Parrot_Interp > >at the moment). > > What benefit would we get?
We get cheap context switching for (cooperative) threads and co-routines: no need to copy one kilobyte of data at each context switch. > Adding a level of indirection loses a bit of speed in often accessed > structure members. So anything that holds the top level struct has 2 > levels of indirection in your way. We can move the most often accessed members to the context structure. Most of them (registers, stacks) will be in this structure anyway. -- Jerome
