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

IanColdwater

Mute these words in your settings here: https://twitter.com/settings/muted_keywords

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seanjensengrey

This is a small demo of how to create a library in Rust and call it from Python (both CPython and PyPy) using the CFFI instead of ctypes.

Based on http://harkablog.com/calling-rust-from-c-and-python.html (dead) which used ctypes

CFFI is nice because:

• Reads C declarations (parses headers)
• Works in both CPython and PyPy (included with PyPy)
• Lower call overhead than ctypes

matheusoliveira

CREATE OR REPLACE FUNCTION public.json_append(data json, insert_data json)
RETURNS json
IMMUTABLE
LANGUAGE sql
AS $$
    SELECT ('{'||string_agg(to_json(key)||':'||value, ',')||'}')::json
    FROM (
        SELECT * FROM json_each(data)
        UNION ALL
        SELECT * FROM json_each(insert_data)

garybernhardt

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

ymirpl

#coding: utf-8
from cStringIO import StringIO
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.header import Header
from email import Charset
from email.generator import Generator
import smtplib
 
# Example address data

bdarnell

"""Demo of streaming requests with Tornado.

This script features a client using AsyncHTTPClient's body_producer
feature to slowly produce a large request body, and two server
handlers to receive this body (one is a proxy that forwards to the
other, also using body_producer).

It also demonstrates flow control: if --client_delay is smaller than
--server_delay, the client will eventually be suspended to allow the
server to catch up. You can see this in the logs, as the "client

davidblewett

import warnings
from collections import (
    Counter, MutableMapping, OrderedDict, deque,
)
from datetime import timedelta
from tornado import gen
from tornado.ioloop import IOLoop, PeriodicCallback


class ExpiringCounter(MutableMapping):

davidblewett

# The following are suggested values
# They should be set in all configs,
# so that if a secondary needs to be promoted
# it will be generating the correct WAL level
wal_level = hot_standby
archive_mode = on               # allows archiving to be done
                                # (change requires restart)
archive_command = 'cp -f %p /data/pgsql/archive/%f </dev/null'          # command to use to archive a logfile segment
max_wal_senders = 5             # max number of walsender processes
                                # (change requires restart)

ewdurbin

aws-cli bash helper functions

The official AWS command line tools, have support for configuration profiles. See Configuring the AWS Command Line Interface - Named Profiles.

Managing multiple profiles with the AWS CLI itself is relatively straight forward, switching between them with --profile flag on the command line or the AWS_PROFILE environment variable.

These helpers extend that functionality for convenience with other tools in the ecosystem.

aws-profile