juniorprincewang

#include <stdio.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#define STORAGE_ID "/SHM_TEST"
#define STORAGE_SIZE 32

int main(int argc, char *argv[])

MattPD

Program Analysis Resources

(draft; work in progress)

See also:

• Compilers
  • correctness
• Program analysis:
• Dynamic analysis - instrumentation, translation, sanitizers

mohanpedala

Table of Contents

• set -e, -u, -x, -o pipefail
• set -e
• set -x
• set -u
• set -o pipefail
• Setting IFS
• Original Reference

set -e, -u, -x, -o pipefail

plusk01

CPU Affinity

In a single core system, the OS allows multiple processes to run by sharing CPU time with the multiple processes. This is called concurrency, which gives the illusion of multiple processes executing at once, but is in fact just using a scheduler to give each process dedicated time on the CPU. The time associated with switching processes on a single core is overhead caused by context switching.

When a multi-core processor is available to an OS (e.g., Linux), the scheduler will do its best to allow processes to run simultaneously (by placing processes on different cores) in addition to running concurrently (different processes on the same core).

To control which core a process runs on, we can tell the scheduler to give a process a certain affinity towards a given set of CPUs.

Using taskset, we can get/set the CPU affinity of a particular process. Consider the following example.

githubfoam

--------------------------------------------------------------------------
# ofed_info -s
--------------------------------------------------------------------------
Find Mellanox Adapter Type and Firmware/Driver version
ConnectX-4 card

# lspci | grep Mellanox
0a:00.0 Network controller: Mellanox Technologies MT27500 Family [ConnectX-3]
# lspci -vv -s 0a:00.0 | grep "Part number" -A 3
# lspci | grep Mellanox | awk '{print $1}' | xargs -i -r mstvpd {}

zuyu

sudo apt update && \
sudo apt install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
sudo apt update && \
sudo apt install gcc-6 g++-6 -y && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 && \
gcc -v

rueycheng

GNU Make Cheatsheet

Based on https://www.gnu.org/software/make/manual/html_node/Quick-Reference.html

Directives

Directive	Description
define variable define variable = define variable := define variable ::= define variable += define variable ?= endef	Define multi-line variables.
undefine variable	Undefining variables.

sloanlance

Editing remote files in Vim with SSH

1. Configure SSH

   In ~/.ssh/config, include the lines:

   Host *
   ControlPath ~/.ssh/sockets/%r@%h-%p
   

pierrejoubert73

How to add a collapsible section in markdown

1. Example

Click me

Heading

1. Foo
2. Bar
   • Baz

• Qux

r00tdaemon

Installation

pip3 install --user pyqt5  
sudo apt-get install python3-pyqt5  
sudo apt-get install pyqt5-dev-tools
sudo apt-get install qttools5-dev-tools

---

Configuring to run from terminal