dideler

# Use this script to test that your Telegram bot works.
#
# Install the dependency
#
#   $ gem install telegram_bot
#
# Run the bot
#
#   $ ruby bot.rb
#

sanchezzzhak

SELECT table,
    formatReadableSize(sum(bytes)) as size,
    min(min_date) as min_date,
    max(max_date) as max_date
    FROM system.parts
    WHERE active
GROUP BY table

a7madgamal

FINALLY no need for tricks!

bonus tip: for more darkness > https://darkreader.org/

whlteXbread

Accessing Your [fast-ai, AWS] Jupyter Notebook from Anywhere

Some networks out in the world don't allow traffic on all ports. For the most part though, HTTP is open just about everywhere.

As we know, Jupyter notebooks don't operate on the standard HTTP port. What follows are a couple ways to use commonly open ports to access your notebook.

I'll discuss two methods, both with their advantages and disadvantages:

• Using SSH to tunnel HTTP traffic through an open SSH port

psayre23

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

martijnvogten

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;

import org.slf4j.Logger;

public class LoggingOutputStream extends OutputStream {
    
	public static void redirectSysOutAndSysErr(Logger logger) {
		System.setOut(new PrintStream(new LoggingOutputStream(logger, LogLevel.INFO)));

nicoulaj

#!/bin/bash

# Get temp dir
tmpdir=$(mktemp -d)

# Generate test
cat > ${tmpdir}/ListenToSignal.java <<EOF
import sun.misc.Signal;
import sun.misc.SignalHandler;
public class ListenToSignal {

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

jboner

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

hanksudo

%%% xmltest.erl
%%%
%%% @author Hank Wang <[email protected]>
%%%
%%% @doc simple sample to parse XML by xmerl
%%%

-module(xmltest).

-include_lib("xmerl/include/xmerl.hrl").