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IWETHEY Home / IWETHEY Board / Theory and Practice of Programming Forum / Parrot is NOT a stack VM
Post #124,774
by ben_tilly
11/9/03 12:44:25 AM
Reply
New Parrot is NOT a stack VM
It is register based. With lots and lots of registers. (The idea being that any architecture which benefits really does. And that doesn't doesn't.) Also everything (as he described) has to have indirection everywhere.

OTOH I'm looking forward to Perl running 3-5 times as fast as at present. With bigger wins still if you are using a register-rich environment (like Opteron in 64-bit mode). ;-)

Cheers,
Ben
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]
Post #124,917
by ChrisR
11/10/03 10:52:58 AM
Reply
New Did catch the Lua VM presentation
Where the new Lua VM is registered based. Lua is restricted to 256 registers. Does Parrot have a similar limit? And doesn't Parrot still have a stack (even with all the registers)?
Post #124,923
by ben_tilly
11/10/03 11:08:22 AM
Reply
New Yes, Parrot has a similar limit
I think that it is 64 registers each of 4 different types.

And yes, there was a stack as well, but each item contains a whole set of registers so you only want to do that when you really, really want to. When I saw "was", I'm admitting that I saw the design before they added pervasive continuations to it. I don't know how continuations have changed things, but I know that it isn't a small change.

So the obvious implementation of Forth is pretty much a worst case.

Cheers,
Ben
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]
     LL3 Webcast - (ChrisR) - (14) - Nov. 7, 2003, 02:12:12 PM EST
         Thanks, looks interesting -NT - (ben_tilly) - Nov. 8, 2003, 01:41:01 AM EST
         Parrot - (jake123) - (7) - Nov. 8, 2003, 10:45:02 AM EST
             Why can't they be part of parrot? - (ben_tilly) - (6) - Nov. 8, 2003, 11:39:53 AM EST
                 Re: Why can't they be part of parrot? - (jake123) - (5) - Nov. 8, 2003, 12:53:34 PM EST
                     That doesn't seem like a valid objection to me - (ben_tilly) - (4) - Nov. 8, 2003, 04:26:31 PM EST
                         No no no no... - (jake123) - (3) - Nov. 8, 2003, 09:22:45 PM EST
                             Right, but you DON'T need to fork Parrot to do it - (ben_tilly) - (2) - Nov. 10, 2003, 10:33:06 AM EST
                                 If you fork the parrot.... - (folkert) - (1) - Nov. 10, 2003, 11:15:27 AM EST
                                     Re: If you fork the parrot.... - (pwhysall) - Nov. 10, 2003, 07:46:44 PM EST
         It was pretty non-specific - (ben_tilly) - (4) - Nov. 8, 2003, 05:30:11 PM EST
             Was hoping he'd delve into Parrot a bit more - (ChrisR) - (3) - Nov. 8, 2003, 10:52:17 PM EST
                 Parrot is NOT a stack VM - (ben_tilly) - (2) - Nov. 9, 2003, 12:44:25 AM EST
                     Did catch the Lua VM presentation - (ChrisR) - (1) - Nov. 10, 2003, 10:52:58 AM EST
                         Yes, Parrot has a similar limit - (ben_tilly) - Nov. 10, 2003, 11:08:22 AM EST

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