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@akorotkov
akorotkov / pg_graph
Created June 5, 2016 10:21
Draw psql output as iTerm2 v3 inline graph using matplotlib
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Draw psql output as iTerm2 v3 inline graph using matplotlib
# Author: Alexander Korotkov <a.korotkov@postgrespro.ru>
import sys
import re
import warnings
import matplotlib
matplotlib.use("Agg")
@tmaiaroto
tmaiaroto / pre-commit
Last active July 30, 2016 22:29
A Go Commit Hook for Less Future Headaches
#!/bin/bash
#
# Check a "few" things to help write more maintainable Go code.
#
# OK, it's fairly comprehensive. So simply remove or comment out
# anything you don't want.
#
# Don't forget to install (go get) each of these tools.
# More info at the URLs provided.
#
#include <vector>
#include <iostream>
#include <cmath>
using namespace std;
#define EPSILON 1.0e-5
#define RESOLUTION 32
class Point2D
@twotwotwo
twotwotwo / sorts.md
Last active December 9, 2023 08:41
Sorting 5x faster with Go: how it's possible, what didn't work so well, and what I learned

github.com/twotwotwo/sorts is a Go package with parallel radix- and quicksorts. It can run up to 5x faster than stdlib sort on the right kind of large sort task, so it could be useful for analysis and indexing/database-y work in which you have to sort millions of items. (To be clear, I don't recommend most folks drop stdlib sort, which is great, and which sorts depends on.)

While the process of writing it's fresh on my mind, here are some technical details, some things that didn't make the cut, and some thoughts about the process:

Concretely, what this looks like inside:

  • Both number and string versions are in-place MSD radix sorts that look at a byte at a time and, once the range being sorted gets down to 128 items, call (essentially) the stdlib's quicksort.

  • The [parallelization code

@jonhoo
jonhoo / README.md
Last active July 19, 2021 10:49
Distributed RWMutex in Go
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active May 2, 2024 22:20
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%'
@jedy
jedy / go_scp.go
Last active May 31, 2022 07:20
an example of scp in golang
// https://blogs.oracle.com/janp/entry/how_the_scp_protocol_works
package main
import (
"fmt"
"golang.org/x/crypto/ssh"
)
const privateKey = `content of id_rsa`