Mruby is a compact implementation of the Ruby programming language with a footprint of less than 400KB that is extensible and allows calling C functions from Ruby code. Mruby/c is an implementation focused on small devices with less than 64KB of memory like one-chip microprocessors. It features small size, compatible bytecode with Mruby, and concurrent execution without an operating system. Mruby and Mruby/c are well suited for IoT software due to their small size and ability to handle networking, hardware control, concurrent programming, and the Ruby language.

1. Why not mruby?
Kyushu Institute of Technology
Kazuaki Tanaka
Shimane IT Open-Innovation Center

2. mruby
• A compact implementation of Ruby
– < 400KB
• Extensible
– Simple C-interface
– Call C functions
– Called from C

3. mruby compiler
and VM
mruby
code
mruby
bytecode
mruby compiler
deploy
mruby VM
microprocessor

4. mruby/c
• Another implementation of mruby
– Focus on small devices
one-chip processors
– < 64KB
Cypress PSoC5LP (ARM Coretex M3)
Renesas RX series
PIC24

5. Features
in mruby/c
• Small
• Compatible bytecode with mruby
• Concurrent execution
– With shared memory
– With scheduler
– Without OS

6. IoT
• Best choice for IoT software
– Network
– Hardware control
– Concurrent programming
– and Ruby

7. GET today
mruby
mruby/c
https://github.com/mrubyc/mrubyc
https://github.com/mruby/mruby