Go Go Gadget Go(lang)
Computer Science 61C Spring 2017
Go Go Gadget Go(lang)
Friedland and Weaver
1
About This Lecture...
Computer Science 61C Spring 2017
? I don't expect you to program in Go for this class...
Friedland and Weaver
? But I admit I'm mightily tempted to encourage 61b to be redone in Go...
? Or create a 161 project in Go
? And I'd like to hope at least 10%+ of the class go "cool" and look into this in more detail
? But the concepts are very interesting
? Interesting enough that I'm kicking myself for not starting to play with it much earlier:
I only started playing with it on the first day of Spring
? In particular, its focus on concurrency maps well to multicore/multiprocessor systems
? Requires shared memory, but programming without shared memory is a much bigger PitA and only
works for some problems
? Since the future is parallel, this is probably a language you should learn
? Just because this wont be on the test doesn't mean you shouldn't know it!
2
What is Go
Computer Science 61C Spring 2017
? Language created at Google starting in 2007
Friedland and Weaver
? Primarily by a bunch of old Unix hands: Robert Griesemer, Rob Pike, and Ken
Thompson
? 1.0 released in March 2012
? Language continues to evolve, but a commitment to backwards compatibility (so far)
? A correct program written today will still work tomorrow
? I'm looking at you, python 3....
? Mostly C-ish but...
? Strong typing, no pointer arithmetic, lambdas, interfaces, and...
? Strong emphasis on concurrent computation
3
Concurrency and Parallelism
Computer Science 61C Spring 2017
Friedland and Weaver
? Concurrency represents the ability to perform multiple
things at the same time
? Reminder
? SIMD: Single Instruction, Multiple Data
? A GPU
? Shared Memory MIMD: Multiple instruction, multiple data, common memory
? A multicore processor
? Clusters: Each computational group has its own independent memory
4
Concurrency doesn't always give parallelism
Computer Science 61C Spring 2017
? Go is concurrent and supports parallel execution
Friedland and Weaver
? The runtime can schedule multiple concurrent routines on separate CPU
threads at the same time
? So a concurrent program in Go running on a 4 core, 2 thread/core Intel processor can be running up to 8 separate streams of execution at one time
? Python's threading is concurrent but not parallel:
? Python has a "global interpreter lock":
Can only execute a single thread of python bytecode at a time
? Python threading code is good for waiting on I/O or special C libraries that
release the global lock
? But generally can not use multiple processors efficiently
5
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