sudo apt install linux-tools-common
To be able to grab performance and kernel events. Lower sampling rate to 10000, if it takes too much time. If it happens kernel will automatically lower perf_event_max_sample_rate. Examine dmesg output for perf: interrupt took too long, lowering kernel.perf_event_max_sample_rate to value.
sudo dmesg -wH | grep perf:
uptime
| // Counting sort algorithm | |
| // https://en.m.wikipedia.org/wiki/Counting_sort | |
| // | |
| // Build clang: | |
| // clang -Wall -Wextra -Wpedantic -g counting_sort.c -o counting_sort | |
| // | |
| // Build gcc: | |
| // gcc -Wall -Wextra -Wpedantic -g counting_sort.c -o counting_sort | |
| typedef int i32; |
Ultra-compact sprite rendering code with example frame animation logic. This release contains tech bits from the upcoming SuperNeo™ 2D game engine and includes anchor/pivot point, rotation, color filtering, alpha blending and built-in antialiased point sampling. As usual: complete, runnable single-function app. ~150 LOC. No modern C++, OOP or (other) obscuring cruft.
Sprites are rendered back-to-front (AKA "painter's algorithm") in the order they are submitted, as one draw call. The provided setup employs a single texture atlas containing all the sprite graphics.
The renderer is "im
Example of how to capture CPU counters with ETW on Windows, perf on Linux or kperf on Apple.
Using ETW needs somewhat recently updated Windows 10 or 11. Not sure about exact version.
Currently tested on:
Not covered here, see https://www.kernel.org/doc/Documentation/vm/transhuge.txt
See https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt
Huge pages cannot be swapped out under memory pressure.
| # Check what ASLR protection do you have (typically 2) | |
| cat /proc/sys/kernel/randomize_va_space | |
| # Disable ASLR global | |
| sysctl -w kernel.randomize_va_space=0 | |
| # Revert ASLR global | |
| sysctl -w kernel.randomize_va_space=2 | |
| # Run <my_binary> with ASLR disabled (-R option) |
Minimal D3D11 sprite renderer: basic back-to-front sprite rendering reference code with example sprite sheet animation logic. As usual: Complete, runnable single-function app. No modern C++ / OOP / obscuring cruft.
Swap out the sprite sheet with a font atlas for a lightweight GUI / text renderer. Clip individual sprites and glyphs by offsetting screenPos and atlasPos to top left corner of visible area and adjusting size accordingly (all values in pixels):
sprite.screenPos.x += 17;
sprite.screenPos.y += 10;
| // ============================================================================= | |
| // XNU kperf/kpc demo | |
| // Available for 64-bit Intel/Apple Silicon, macOS/iOS, with root privileges | |
| // | |
| // | |
| // Demo 1 (profile a function in current thread): | |
| // 1. Open directory '/usr/share/kpep/', find your CPU PMC database. | |
| // M1 (Pro/Max/Ultra): /usr/share/kpep/a14.plist | |
| // M2 (Pro/Max): /usr/share/kpep/a15.plist | |
| // M3: /usr/share/kpep/as1.plist |
| // | |
| // PUBLIC DOMAIN CRT STYLED SCAN-LINE SHADER | |
| // | |
| // by Timothy Lottes | |
| // | |
| // This is more along the style of a really good CGA arcade monitor. | |
| // With RGB inputs instead of NTSC. | |
| // The shadow mask example has the mask rotated 90 degrees for less chromatic aberration. | |
| // | |
| // Left it unoptimized to show the theory behind the algorithm. |
