april

# this forces Arena into full screen mode on startup, set back to 3 to reset
# note that if you go into the Arena "Graphics" preference panel, it will reset all of these
# and you will need to run these commands again
defaults write com.wizards.mtga "Screenmanager Fullscreen mode" -integer 0
defaults write com.wizards.mtga "Screenmanager Resolution Use Native" -integer 0

# you can also replace the long complicated integer bit with any other scaled 16:9
# resolution your system supports.
# to find the scaled resolutions, go to System Preferences --> Display and then
# divide the width by 16 and multiple by 9. on my personal system this ends up

simonrenger

Memory Management Lecture - Breda University of applied sciences - Games

This is the resource repositry for my memory managment lecture / workshop series at Breda University of applied sciences - Games. It is mainly targeted for game developers

Content

• Great Reads directly about Memory Managment
• Great Youtube Videos directly about Memory Managment
• Great C++ PMR related Talks, Reads
• Related Videos & Articles as important
• Memory Debugger
• Libs, frameworks

mepcotterell

Implementing a Semaphore

Use the following commands to compile and link the examples:

$ gcc -std=c17 -pedantic-errors -O0 -g -S sem.c
$ as --gstabs -o sem.o sem.s 
$ gcc -o sem sem.o -lpthread

This implementation makes use of the C11 Atomic Operations Library.

mepcotterell

Implementing a Mutex

Use the following commands to compile and link the examples:

$ gcc -std=c17 -pedantic-errors -O0 -g -S mutex.c
$ as --gstabs -o mutex.o mutex.s 
$ gcc -o mutex mutex.o -lpthread

This implementation makes use of the C11 Atomic Operations Library.

auchenberg

window.onwheel = function (e) {
  e.preventDefault();

  if (e.ctrlKey) {
    // Your zoom/scale factor
    scale -= e.deltaY * 0.01;
  } else {
    // Your trackpad X and Y positions
    posX -= e.deltaX * 2;
    posY -= e.deltaY * 2;

thiloplanz

Zero knowledge databases

The idea

The idea is to provide a database as a service to end users in such a way that no one except the user herself can access the data, not even the hosting provider or the database administrator.

Advantages

• A privacy- and/or security-conscious user will have more trust in such a setup.
• The service provider cannot be coerced to release the data they were trusted with, and he cannot be held responsible for the content he is storing.

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD