BerryBots demo

Figured I'd take this to a separate thread. =) Posted another couple of vids with progress on the Raspberry Pi game I'm working on.

• part 1: sample stages, battle mode
• part 2: stage and bot APIs

Still a lot to do but I think it's coming along pretty well.

Nice, looking neat :)

Wonder how strategies will play out... hmm

Man, you are totally of the hook :). Looks indeed very neat. The race looks and sound as it could provide a lot of fun and maybe some nice pathfinding programming.

Well done!

(Sorry, gotta take this back to LiquidThreads.. =))

If anyone's curious, here's some TPS measurements (with graphics off) of Lua vs LuaJIT on the Raspberry Pi and my 2009 MacBook Pro 2.8 GHz. RandomBot is a trivial bot like sample.Crazy, BasicBattler is a slightly non-stupid bot with a simple Minimum Risk movement and random linear gun.

• 2x BasicBattler
  • Rpi Lua: 343
  • Rpi LuaJIT: 632
  • MBP Lua: 5967
  • MBP LuaJIT: 19101

• 8x BasicBattler
  • Rpi Lua: 44
  • Rpi LuaJIT: 88
  • MBP Lua: 766
  • MBP LuaJIT: 2377

• 2x RandomBot
  • Rpi Lua: 782
  • Rpi LuaJIT: 1053
  • MBP Lua: 17781
  • MBP LuaJIT: 28154

• 8x RandomBot
  • Rpi Lua: 119
  • Rpi LuaJIT: 182
  • MBP Lua: 2429
  • MBP LuaJIT: 4159

Obviously the LuaJIT is far superior in speed.

LuaJIT vs Lua

• 2xBB
  • RPI: x1.84
  • MBP: x3.2
• 8xBB
  • RPI: x2
  • MBP: x3.1
• 2xRB
  • RPI: x1.35
  • MBP: x1.58
• 8xRB
  • RPI: x1.53
  • MBP: x1.71

Even considering a margin of error, it seems the x86/amd64 version is either more mature or has a more leverage-able machine code (assuming your mac book is intel rather then PPC based).

It seems to scale up on complexity. Be it more bots or more complex bots.

I think there might be a fixed, constant overhead each time you call the Lua code, so the actual advantage within the Lua code is actually much higher. From the results with RB, it seems that LuaJIT also has a smaller overhead constant.

About the difference between AMD64 vs ARMv6 instruction set, one is CISC other is RISC, so the CISC will benefit more from the pure assembly components that were part of LuaJIT because more suitable instructions can be used to do multiple steps in one instruction. At least, that's my guess.