commit 2ca8e2e54008e9abc1d4698902016884016d981b
parent 69bfe6a9a92596ef6ca484383793b4d256f76355
Author: dwrz <dwrz@dwrz.net>
Date: Fri, 5 Jun 2020 14:57:30 +0000
Update concurrency slides
Diffstat:
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/concurrency/slides.org b/concurrency/slides.org
@@ -18,8 +18,9 @@ You'll likely encounter it at work:
Performance Benefits
-- I/O versus CPU bound applications.
- Typically outweigh gains from optimized data structures and algorithms.
+ - I/O versus CPU bound applications.
+
- Hardware limitations.
- Rate of single core performance improvement is slowing.
- More cores.
@@ -113,9 +114,9 @@ Computers can "simultaneously" work on:
* 15. How?
-- Operating System's *Scheduler*
-- Hardware
- - /Interrupts/
+Combination of:
+- Operating System *Scheduler*
+- Hardware (/interrupts/)
* 17. Cooperative Scheduling
[[file:images/cooperative-scheduling.jpg]]
@@ -131,7 +132,7 @@ Computers can "simultaneously" work on:
* 21. Concurrency versus Parallelism
-- Parallelism :: performing computations at the same moment.
+- Parallelism :: performing computations at the same time.
- Multiple cores.
- Multiples computers.
- Kind of like having multiple cooks in a kitchen.
@@ -150,7 +151,7 @@ A little more nuance.
- Process :: a program in execution.
- Start off with one thread.
- Can /fork/.
- - Inter-Process Communication
+ - Communicate via inter-process communication (IPC).
- Thread :: sequence of instructions that can be managed independently by scheduler.
- Share resources ∴ less resource intensive.
@@ -169,7 +170,7 @@ Press ~H~ to show threads.
* 25. Languages and Runtimes
- ~C~, ~C++~, ~Rust~ allow for fine-grained control of processes and threads.
-#+begin_src C
+#+begin_src C :output raw
int main() {
fork();
@@ -179,7 +180,7 @@ int main() {
}
#+end_src
-* 26. nodejs
+* 26. JavaScript
- Single-threaded (for application code).
- Runtimes implement concurrency via an event loop.
@@ -199,7 +200,8 @@ Source: https://freethreads.net/2019/01/23/go-runtime-scheduler-design-internals
- Sequential versus Concurrent Steps
- Compare with recipes.
- Concurrency versus Parallelism
- - Multiple cooks.
+ - Parallelism: multiple cooks, simultaneously /doing/.
+ - Concurrency: one or more cooks, simultaneously /dealing/ with many tasks.
- Operating System Scheduler
- Processes and Threads
- Languages and Runtimes
