jarovo

openapi: 3.1.1
info:
  title: Web-scraped Fakturoid V3 API
  description: This is web-scraped definition of Fakturoid.
  contact:
    name: Jaroslav Henner
    url: https://github.com/jarovo/fakturoid-api/
  license:
    name: >-
      Web-scraped Fakturoid API V3 © 2025 by Jaroslav Henner is licensed under

jarovo

import os
import subprocess
import pathlib
import sys

_BASE = pathlib.Path(__file__).parent / "scripts"

def _run(script_name: str):
    script = _BASE / script_name
    if not script.exists():

jarovo

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

jarovo

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

jarovo

from __future__ import print_function
import serial
from pymodbus.client.sync import ModbusSerialClient
from time import sleep
import ctypes

mb=ModbusSerialClient(method='rtu', port='/dev/extcomm/0/0', stopbits=1, bytesize=8,
                      parity=serial.PARITY_NONE, baudrate=19200, timeout=.1)

upper_limit=40

jarovo

## Now with python3k support!


$ python foo.py &
[1] 21377
$ gdb -p 21377
GNU gdb (GDB) Fedora 7.7.1-17.fc20
[... gdb loading messages ...]
0x00007f9a09af46e3 in __select_nocancel () at ../sysdeps/unix/syscall-template.S:81
81	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)