Nvidia 3GB mining is still alive

Today I started to mine BTG on my 3GB farm. The miner consumes about 1.7MB on HiveOS:

BTG did 3X in April and theoretically it can be the most profitable coin on 3GB cards.


Resizing a partition on HiveOS

There was some strange partition /dev/sda2 of 6.5G size on my HiveOS:

root@rig0:/# cat /proc/partitions
major minor  #blocks  name                                                                                                                                                                                         

8        0  117219767 sda                                                                                                                                                                                       
8        1      20480 sda1                                                                                                                                                                                      
8        2    7323648 sda2             

root@rig0:/# df -h                                                                                                                                                                                                 
Filesystem      Size  Used Avail Use% Mounted on                                                                                                                                                                   
udev            1.9G     0  1.9G   0% /dev                                                                                                                                                                         
tmpfs           383M   44M  340M  12% /run                                                                                                                                                                         
/dev/sda2       6.8G  6.5G     0 100% /                                                                                                                                                                            
tmpfs           1.9G     0  1.9G   0% /dev/shm                                                                                                                                                                     
tmpfs           5.0M     0  5.0M   0% /run/lock                                                                                                                                                                    
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup                                                                                                                                                               
tmpfs           100M   16K  100M   1% /tmp                                                                                                                                                                         
tmpfs           1.9G     0  1.9G   0% /var/tmp                                                                                                                                                                     
tmpfs           1.9G   30M  1.9G   2% /var/log                                                                                                                                                                     
tmpfs           1.9G     0  1.9G   0% /var/log/journal                                                                                                                                                             
tmpfs           1.9G     0  1.9G   0% /var/log/apt                                                                                                                                                                 
/dev/sda1        20M  5.7M   15M  29% /hive-config

Terribly slow file upload with Rostelecom internet provider

When I upload a file via SSH to my VPS server with Beeline mobile internet connection, the speed is about 300KB/sec – 800KB/sec:


Installing Jabber Messaging Service on Ubuntu 16.04

sudo apt install ejabberd
ufw allow to any port 5280 proto tcp
ufw allow to any port 5222 proto tcp
ufw allow to any port 5269 proto tcp
ufw allow to any port 7777 proto tcp
sudo nano /etc/ejabberd/ejabberd.yml
## hosts: Domains served by ejabberd.
## You can define one or several, for example:
## hosts:
##   - "example.net"
##   - "example.com"
##   - "example.org"
  - "developernote.com"


###.   ====================
  ## The 'admin' ACL grants administrative privileges to XMPP accounts.
  ## You can put here as many accounts as you want.
         - "admin": "developernote.com"

Negating the minimal integer result in an overflow in C++

The code below compiles with a warning:

#include <iostream>
#include <limits>
#include <cstdint>

int main()
    int64_t m1 = -std::numeric_limits<int64_t>::min();
    int64_t m2 = -m1;
    std::cout << m1 << std::endl << m2 << std::endl << std::numeric_limits<int64_t>::max() << std::endl;
    return 0;

Dragging a link from a browser to a QML app

When a link is dragged from a browser on Window 10 platform it contains the page title, but they did not make it accessible in QML:

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Scroll")
    id: root

    DropArea {
        id: dropArea;
        anchors.fill: parent
        onEntered: {
            root.color = "gray";
            drag.accept (Qt.LinkAction);

Running a Tron node on Ubuntu 20.04 WSL

Installed Java SDK:

sudo apt update
sudo apt install default-jdk
javac --version

Cloned the repository:

git clone https://github.com/tronprotocol/wallet-cli

And found the following in wallet-cli\src\main\resources\config.conf:


The sum of signed and unsigned is unsigned in C++

#include <iostream>

template <typename T>
void PrintValue(T val)
    if constexpr (std::is_signed_v<T>)
        std::cout << "signed";
        std::cout << "unsigned";

    std::cout << std::endl << val << std::endl;

Installed Post Password Token WordPress plugin

When the user enters a page or post password WordPress sets wp_postpass_XXXX cookie:

Use chrome://settings/cookies/detail?site=developernote.com to see the cookies in Google Chrome browser.


How I used OMNI USDT client on my home Windows machine

First, as a true C++ developer, I installed Ubuntu 18.04 and compiled omnicore from sources, but after that I realized that Windows omnicore-0.9.0 client can be downloaded and run directly on my Windows 10 machine.

I found omnicore-qt.exe in the unpacked files and run it: