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@hgmnz
hgmnz / query_planner.markdown
Created March 23, 2011 14:14
PostgreSQL query plan and SQL performance notes

Types of index scans

Indexes

Sequential Scan:

  • Read every row in the table
  • No reading of index. Reading from indexes is also expensive.
@tarcieri
tarcieri / pmap_fetch_benchmark.rb
Created May 11, 2011 06:28
Concurrent HTTP fetching benchmark with Enumerable#pmap
require 'celluloid'
require 'open-uri'
require 'cgi'
require 'benchmark'
module Enumerable
def pmap(&block)
futures = map { |elem| Celluloid::Future(elem, &block) }
futures.map { |future| future.value }
end
@stonegao
stonegao / rest.scala
Created October 9, 2011 16:05 — forked from robi42/rest.scala
Basic RESTful service with Finagle
class Respond extends Service[Request, Response] with Logger {
def apply(request: Request) = {
try {
request.method -> Path(request.path) match {
case GET -> Root / "todos" => Future.value {
val data = Todos.allAsJson
debug("data: %s" format data)
Responses.json(data, acceptsGzip(request))
}
case GET -> Root / "todos" / id => Future.value {
@seratch
seratch / build.sbt
Created December 1, 2011 06:07
Scala School - Testing with specs2 examples
organization := "net.seratch"
name := "sandbox"
version := "0.1"
scalaVersion := "2.9.1"
libraryDependencies ++= Seq(
"junit" % "junit" % "4.9" withSources(),
@shanlalit
shanlalit / Changes to Support Single-User RVM Install
Created December 30, 2011 08:58
Munin passenger plugin with Single-User RVM Install
Munin Passenger Plug-in Installation
Configure the passenger plug-ins according the the guide on http://www.alfajango.com/blog/how-to-monitor-your-railspassenger-app-with-munin/
NOTE: restart munin after implementing the following changes for Single-User RVM
sudo nano /etc/munin/plugin-conf.d/munin-node
[passenger_*]
user root
@tototoshi
tototoshi / finagle_http_hello.scala
Created May 19, 2012 04:11
finagle-http で Hello, world.
package com.github.tototoshi.finagle_hack
import java.net.InetSocketAddress
import com.twitter.finagle.{Service, SimpleFilter}
import com.twitter.util.Future
import com.twitter.finagle.builder.{Server, ServerBuilder}
import com.twitter.finagle.http._
import com.twitter.finagle.http.path._
object HTTPServer {
@matiaskorhonen
matiaskorhonen / gist:3013808
Created June 28, 2012 20:44
Chrome for iOS user-agents

Chrome for iOS user-agents

iPhone

Mozilla/5.0 (iPhone; U; CPU iPhone OS 5_1_1 like Mac OS X; en-gb)
AppleWebKit/534.46.0 (KHTML, like Gecko)
CriOS/19.0.1084.60 Mobile/9B206 Safari/7534.48.3
@jedy
jedy / reader.go
Created August 7, 2012 07:20
processes communicate with shared memory in golang
package main
// #include <stdlib.h>
// #include "wrapper.c"
import "C"
import "unsafe"
import "fmt"
func read(filename string) string {
f := C.CString(filename)
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active July 22, 2024 23:19
Useful PostgreSQL Queries and Commands
-- 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%'
@dypsilon
dypsilon / frontendDevlopmentBookmarks.md
Last active July 7, 2024 19:32
A badass list of frontend development resources I collected over time.