flaviut

zstd compression results for random sample

I've taken a random sample of my HDD with generate_sample_file.py, and run some benchmarks on the zstd compression level and duration with various parameters.

flaviut

#include <iostream>
#include <iomanip>
#include <pico/divider.h>
#include "fpm/fixed.hpp"
// from https://github.com/JoelFilho/EMB
#include "emb.hpp"
#include "smartdevice/Debug.hpp"

#pragma GCC optimize("O3")

flaviut

#!/bin/bash
#
# Copyright (c) Authors: https://www.armbian.com/authors
#
# This file is licensed under the terms of the GNU General Public
# License version 2. This program is licensed "as is" without any
# warranty of any kind, whether express or implied.

# DO NOT EDIT THIS FILE but add config options to /etc/default/armbian-motd
# any changes will be lost on board support package update

flaviut

This tool decodes an ESP32 stack trace into a human-readable stack trace. The original stack trace generally gets printed to the serial console when the esp32 crashes.

Usage example:

$ python decode.py -a ~/.platformio/packages/toolchain-xtensa-esp32/bin/xtensa-esp32-elf-addr2line ./.pio/build/esp32-3248S035C/firmware.elf
Backtrace: 0x400eee2e:0x3ffb1eb0 0x400ed765:0x3ffb1ed0 0x400f1317:0x3ffb1ef0 0x400f1576:0x3ffb1f60 0x400ebc80:0x3ffb1f80 0x400ebeed:0x3ffb1fa0 0x400d74cb:0x3ffb1fc0 0x400dcd46:0x3ffb1fe0 0x400dcda2:0x3ffb2000 0x400ebd81:0x3ffb2040 0x400dcd46:0x3ffb2060 0x400dcda2:0x3ffb2080 0x400f1954:0x3ffb20c0 0x4019f9ce:0x3ffb20f0 0x400dcbf7:0x3ffb2110 0x400dcda2:0x3ffb2130 0x400dceda:0x3ffb2170 0x400dd56c:0x3ffb21a0 0x400eea88:0x3ffb21f0 0x400d5252:0x3ffb2220 0x400d7715:0x3ffb2240 0x400d661d:0x3ffb2260 0x4010a32e:0x3ffb2290
lv_tlsf_free at .pio/libdeps/esp32-3248S035C/lvgl/src/misc/lv_tlsf.c:1167
lv_mem_free at .pio/libdeps/esp32-3248S035C/lvgl/src/misc/lv_mem.c:179
allocate_btn_areas_and_controls 

flaviut

An optimized version of tickprocessor from the node source code: https://github.com/nodejs/node/blob/main/deps/v8/tools/

This is also directly compatible with nodejs & doesn't require d8.

Usage:

$ node --max-old-space-size=16000 tickprocessor-driver.mjs --preprocess -j v8-etc.log > output.txt

flaviut

import socket
import struct
import time
from dataclasses import dataclass
from enum import IntEnum
from typing import Optional

NTP_SERVER = "pool.ntp.org"
NTP_PORT = 123
TIME1970 = 2208988800  # 1970-01-01 in NTP epoch

flaviut

#!/usr/bin/env python

# use with `strace --absolute-timestamps=format:unix,precision:us -o strace.log yourprogram`.

import re
import csv
import os
from collections import defaultdict
import plotly.express as px

flaviut

chip "nvme-pci-*"
    label temp2 "flash"
    label temp3 "cpu"

# ASRock B350 Fatal1ty Gaming ITX/ac
# 2019, contributed by Erdem U. Altinyurt
# Modified by Flaviu Tamas
#
# dmi: board_name: B350 Fatal1ty Gaming ITX/ac

flaviut

Get all user tables & size

SELECT database, table, storage_policy, round(total_bytes / 1024 / 1024) as MiB
FROM system.tables 
WHERE storage_policy IS NOT NULL AND lower(database) NOT IN ('system', 'information_schema')
ORDER BY MiB DESC;

Get all user tables with TTLs

flaviut

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""Script to draw bounding boxes and text from a Tesseract box file.

The script takes an image TIFF_FILE, draws the text and bounding boxes
of the corresponding BOX_FILE and saves the resulting OUT_FILE.

Tesseract box file columns:
<symbol> <left> <bottom> <right> <top> <page>