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robinvanemden / GCC compiler optimization for ARM-based systems.md
Last active April 11, 2021 16:36
GCC compiler optimization for ARM-based systems

GCC compiler optimization for ARM-based systems

The gcc compiler can optimize code by taking advantage of CPU specific features. Especially for ARM CPU's, this can have impact on application performance. ARM CPU's, even under the same architecture, could be implemented with different versions of floating point units (FPU). Utilizing full FPU potential improves performance of heavier operating systems such as full Linux distributions.

-mcpu, -march: Defining the CPU type and architecture

These flags can both be used to set the CPU type. Setting one or the other is sufficient.

GCC supports all Cortex-A processors up to A15 (2010). Example are 'cortex-a5', 'cortex-a7', 'cortex-a8', 'cortex-a9', 'cortex-a15'. For specific values on popular boards see table below.

@robinvanemden
robinvanemden / ttyecho.c
Created February 14, 2021 10:18 — forked from FUT/ttyecho.c
Send terminal command to a TTY terminal
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <string.h>
#include <unistd.h>
void print_help(char *prog_name) {
printf("Usage: %s [-n] DEVNAME COMMAND\n", prog_name);
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robinvanemden / install-linux-perf-on-wsl2.sh
Created October 30, 2020 19:43 — forked from abel0b/install-linux-perf-on-wsl2.sh
Install perf on WSL 2
set -x
apt install flex bison
git clone https://github.com/microsoft/WSL2-Linux-Kernel --depth 1
cd WSL2-Linux-Kernel/tools/perf
make -j8
sudo cp perf /usr/local/bin
@robinvanemden
robinvanemden / install_latest_protobuf_ubuntu.sh
Last active December 30, 2020 16:20
Install latest protobuf c/c++ lib (at time of writing, 3.14.0) on Ubuntu 18.04 x86_64
#!/bin/bash
sudo apt-get install autoconf automake libtool curl make g++ unzip
##### EITHER LATEST FULL ####
# git clone --recurse-submodules https://github.com/protocolbuffers/protobuf.git /root/protobuf
##### OR C/C++ VERSION ####
wget https://github.com/protocolbuffers/protobuf/releases/download/v3.14.0/protobuf-cpp-3.14.0.tar.gz
tar -zxvf protobuf-cpp-3.14.0.tar.gz
@robinvanemden
robinvanemden / wasm-summit-2020-notes.md
Created February 21, 2020 10:47 — forked from bushidocodes/wasm-summit-2020-notes.md
WebAssembly Summit 2020 Notes

WebAssembly Summit 2020

https://webassembly-summit.org/

Lin Clark's Talk - "WebAssembly Nanoprocess"

  • the missing functionality alongside WASI and Interface Types is something that provides "capability-based security".
  • Delegation of permissions to propagate down transitive dependencies
  • plan to use fine-grain form of per-module virtualization
  • A "WebAssembly nanoprocess" is just wasm, but follows a particular pattern.
@robinvanemden
robinvanemden / Makefile
Created February 14, 2020 19:25 — forked from keeferrourke/Makefile
Generic Makefile
# Generic makefile for a C project
# Written by Keefer Rourke <[email protected]>
#
# This file is Public Domain or, in places where public domain works
# are not recognized, licensed as CC0. Legal text:
# <https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt>
#
# This Makefile should not rely and any GNU-specific functionality,
# though it is based on the GNU make documentation which is available
# at: <https://www.gnu.org/software/make/manual/make.html>
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robinvanemden / toUTF8Array.js
Created December 14, 2019 10:16 — forked from joni/toUTF8Array.js
toUTF8Array: Javascript function for encoding a string in UTF8.
function toUTF8Array(str) {
var utf8 = [];
for (var i=0; i < str.length; i++) {
var charcode = str.charCodeAt(i);
if (charcode < 0x80) utf8.push(charcode);
else if (charcode < 0x800) {
utf8.push(0xc0 | (charcode >> 6),
0x80 | (charcode & 0x3f));
}
else if (charcode < 0xd800 || charcode >= 0xe000) {
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robinvanemden / github_webhook.php
Created October 26, 2019 08:55 — forked from lejenome/github_webhook.php
Github Push Webhook - https://lejenome.tik.tn/post/github-push-webhook-implementation
<?php
// Webhook code to update repo clone and execute required deployement code when new commit was pushed
// Webhook content-type should be set to application/json and a random secret code should be set too.
// Secret Random Code You set on github webhook settings
const SECRET_TOKEN = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';
if(strcasecmp($_SERVER['REQUEST_METHOD'], 'POST') != 0){
throw new Exception('Request method must be POST!');
}
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robinvanemden / A Boosting Algorithm for Estimating Generalized Propensity Scores.R
Created June 25, 2019 08:13
Code from "A Boosting Algorithm for Estimating Generalized Propensity Scores" by Zhu, Coffman, & Ghosh (2015)
F.aac.iter=function(i,data,ps.model,ps.num,rep,criterion) {
# i: number of iterations (trees)
# data: dataset containing the treatment and the covariates
# ps.model: the boosting model to estimate p(T_i|X_i)
# ps.num: the estimated p(T_i)
# rep: number of replications in bootstrap
# criterion: the correlation metric used as the stopping criterion
GBM.fitted=predict(ps.model,newdata=data,n.trees=floor(i),
@robinvanemden
robinvanemden / extract_frames.py
Last active May 23, 2019 09:12
Basic Python script for fast extraction of stills from videos through calls to ffmpeg using filenames and timestamps from an SPSS file
import os
import subprocess
import pyreadstat
import logging
import datetime
# configuration
input_directory = 'C:/Users/robin/PycharmProjects/asmir_cry_project/in'
output_directory = 'C:/Users/robin/PycharmProjects/asmir_cry_project/out'