Sockets to Parallelism

Threads

• a way to execute multiple concurrent flows of control with a single process
• threads are implemented as kernel tasks that share resources
• each thread gets its own thread id
• all threads share a process id
• thread groups manage resource sharing and accounting

Feature	Posix Thread	Python Threads
Memory Model	Direct shared memory access	Shared memory but GIL-controlled
Creation overhead	lightweight	similar overhead
Thread safety	manually synchronization required	built-in thread safe object
Implementation	native OS implementation	Python interpreter managed

• The Global interpreter lock is a road block
• IO bound operations benifit from it (this is very dependent on the implementation, im saying this not my teacher...)

CPU vs IO Bound Operations

• matrix multiplication (cpu bound)
• sorting (depends...)
• sums (depends...)
• random subset sums (io bound)
• technically all of these are dependent but