vapopov

Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

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Performance of Flask, Tornado, GEvent, and their combinations

Wensheng Wang, 10/1/11

Source: http://blog.wensheng.org/2011/10/performance-of-flask-tornado-gevent-and.html

When choosing a web framework, I pretty much have eyes set on Tornado. But I heard good things about Flask and Gevent. So I tested the performance of each and combinations of the three. I chose something just a little more advanced than a "Hello World" program to write - one that use templates. Here are the codes:

1, Pure Flask (pure_flask.py)

vapopov

Build a scalable Twitter clone with Django and GetStream.io

In this tutorial we are going to build a Twitter clone using Django and GetStream.io, a hosted API for newsfeed development. We will show you how easy is to power your newsfeeds with GetStream.io. At the end of this tutorial we will have a Django app with a profile feed, a timeline feed, support for following users, hashtags and mentions.

I assume that you are familiar with Django. If you're new to Django the [official tutorial] (https://docs.Djangoproject.com/en/1.7/intro/install/) explains it very well.

Bootstrap the Django application

vapopov

# create a redis app
flynn create --remote "" redis

# create a release using the latest (at the time of writing) Docker Redis image
flynn -a redis release add -f config.json "https://registry.hub.docker.com?name=redis&id=868be653dea3ff6082b043c0f34b95bb180cc82ab14a18d9d6b8e27b7929762c"

# scale the server to one process. This may time out initially as the server pulls the image, but watch "flynn -a redis ps" and should come up.
flynn -a redis scale server=1

# redis should now be running in the cluster at redis.discoverd:6379

vapopov

Keybase proof

I hereby claim:

• I am vapopov on github.
• I am vapopov (https://keybase.io/vapopov) on keybase.
• I have a public key ASA25p8wbBSuMWXaDrhwQbY40MTVwpTg2Z9WOVGDctfQawo

To claim this, I am signing this object:

vapopov

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

vapopov

package main

import (
	"database/sql"
	"errors"
	"fmt"
	_ "github.com/bmizerany/pq"
	"os"
	"regexp"
	"strings"

vapopov

import asyncio
from concurrent import futures
import functools
import inspect
import threading

from grpc import _server

def _loop_mgr(loop: asyncio.AbstractEventLoop):

vapopov

def solution(S, T):
    S = 'a10'
    T = '10a'

    any_lenth_S = 0
    any_lenth_T = 0

vapopov

lncli --no-macaroons connect 03193d512b010997885b232ecd6b300917e5288de8785d6d9f619a8952728c78e8@testnet-lnd.htlc.me         
{

}
~/g/s/g/l/replenish-server ❯ lncli --no-macaroons walletbalance                                                                                                                                
{
    "total_balance": "51639731",
    "confirmed_balance": "51639731",
    "unconfirmed_balance": "0"
}