MatiasVara

for i in 1000 200 120 50 20 10 2;
do
  paplay --latency-ms=$i 44100_s16_2chan_file.wav &
  PID=$!
  sleep 1
  echo "Latency $i 44100 server:"
  sudo perf stat -p `pidof pipewire-uninstalled` --timeout 5000
  echo "latency $i 44100 client:"
  sudo perf stat -p $PID --timeout 5000
  kill -9 $PID

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import asyncio
from qemu.qmp import QMPClient
import argparse
from subprocess import call
import os

async def main():
    parser = argparse.ArgumentParser(description='Pin QEMU vCPUs to physical CPUs')
    parser.add_argument('-s', '--server', type=str, required=True, help='QMP server path or address:port')
    parser.add_argument('cpu', type=int, nargs='+', help='Physical CPUs IDs')

MatiasVara

// share ownership across multiple threads
// https://doc.rust-lang.org/book/ch16-03-shared-state.html
//
use std::thread;
use std::sync::{Arc,RwLock};

struct User {
    index: u32,
}

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use std::time::Duration;
use async_std::task;
use std::{thread, time};

// this is something that will take some time
// to execute so we execute it as an async function
// to not block the main thread. This function must not block
async fn do_sleep(val: u32) {
    task::sleep(Duration::from_secs(3)).await;
    println!("hello, world! {}", val);

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(qemu) info virtio
/machine/peripheral-anon/device[2]/virtio-backend [virtio-blk]
/machine/peripheral-anon/device[1]/virtio-backend [virtio-sound]
/machine/peripheral-anon/device[0]/virtio-backend [virtio-net]
(qemu) info virtio-queue-element  /machine/peripheral-anon/device[1]/virtio-backend 2 
/machine/peripheral-anon/device[1]/virtio-backend:
  device_name: virtio-sound
  index:   12
  desc:
    descs:

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syntax on
filetype plugin indent on
command Cleanit %s/\s\+$//e
" show existing tab with 4 spaces width
set tabstop=4
" when indenting with '>', use 4 spaces width
set shiftwidth=4
autocmd BufWritePre *.pas %s/\s\+$//e
" On pressing tab, insert 4 spaces
set expandtab

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You require to install docker and KVM before to run these commands:

docker pull torokernel/toro-kernel-dev-debian-10
docker run --privileged --rm -it torokernel/toro-kernel-dev-debian-10
cd examples/MPI
make
../CloudIt.sh MpiReduce

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This is the procedure to push an image to a repository that the user has the right to access, e.g., organization.

docker login
docker pull torokernel/toro-kernel-dev-debian-10
docker build --no-cache -t torokernel/toro-kernel-dev-debian-10 .
docker push torokernel/toro-kernel-dev-debian-10

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#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
echo -e "\nBoot took $(cut -d' ' -f1 /proc/uptime) seconds\n"
setsid  cttyhack sh 
exec /bin/sh

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Introduction

This gist aims at building Linux from source-code and deploying it as HVM guest in Xen by using xl.

Building Linux

We use v5.10.17 tag (13b6016). We first build .config by issuing:

make localmodconfig

To enable debug symbols, you can set:

CONFIG_DEBUG_INFO_NONE=y