Tuning wifi on Mac OS 10.10.3 Yosemite

I’ve experienced increasingly bad wifi performance on my Macbook Air over time. This has been accentuated further by me being somewhere with a lot of network lag. I did some research and the following suggestions made the wifi faster and more responsive with Mac OS 10.10.3 Yosemite.

1. Disable Bluetooth. I don’t use any wireless mice/keyboard/headsets, so Bluetooth doesn’t do anything for me.

2. Disable Facetime. Command+Space, Facetime. File > Preferences > [ ] Enable this account. I’ve never used Facetime, but from what I understand it’s Apple’s clone of Skype that only works with other Apple users.

3. Disable Handoff. System Preferences > General > [ ] Allow Handoff between this Mac and your iCloud devices. Handoff is Apple’s recent attempt to increase platform lock-in for those unfortunate souls who use non-Macbook Apple devices. Seemingly, it negatively affects network performance.

These three steps noticeably improved my wifi performance.

If that doesn’t help, there are more involved things you can do to tune Yosemite wifi performance or work around other Yosemite bugs.

I, for one, look forward to the forthcoming release of Mac OS 10.11 El Capitan.

 

#DUTO2015 conference

I’m at the Data Unconference in Toronto today. Jarred Gaertner just gave a through-provoking keynote on the ethics of big data, and I’m about to dig my hands into some open data sets in Richard Pietro’s hands-on session.

My colleague Polong Lin will be on a panel about IBM’s data science tools this afternoon, which should be interesting if only because it’s hard to keep track of everything that’s out there.

#DUTO2015 is sponsored by my friends at Big Data University

$10k! Spark hackathon in San Fran

I’ll be in San Francisco this weekend helping run the Apache Spark hackathon, and afterwards I’ll be at Spark Summit 2015.

If you’re curious at all about Spark, you should come out and hack with us. We’ll have some fun data sets and help you find a team.

You can take the free Spark Fundamentals course on Big Data University to brush up on your Spark skills. Spark is a framework for fast in-memory and batch analytics processing. It’s algorithmically smarter and so a lot faster than traditional Hadoop.

There’s $10k in prizes at the hackathon.

Encrypt Gmail, Facebook emails with OpenPGP and Mailvelope

Facebook just released a great use case for OpenPGP encryption in Gmail and other web email providers. You can now configure Facebook to encrypt all email it sends you with OpenPGP.

Whether or not you use Facebook, it’s surprisingly easy to use Mailvelope to integrate OpenPGP with Gmail and other email providers. Mailvelope is a browser extension for Chrome and Firefox that lets you encrypt messages that you write and decrypt messages that you receive.

The encryption can be done externally to the web email interface, so your email provider does not have access to the plain text of your email message.

OpenPGP is based on public key cryptography. You have two keys — a public key you can share with everyone, and a private key that you keep secret. Everyone can use your public key to encrypt messages they send you, but only you can decrypt them using your private key.

Why encrypt email? Email is generally transmitted in plain text across the internet, meaning a hostile party can intercept it. With the web (http) moving to encrypted connections for everything, email is left as an insecure communication medium. You as a user have to take active steps to make it secure.

Here’s how you can transparently integrate OpenPGP encryption with Gmail and Facebook:

  1. Install Mailvelope
  2. Generate a new key in Mailvelope options
  3. Go to Display Keys, click on a key, go to Export, and copy the public key
  4. Open your Facebook profile, go to About > Contact and Basic Info, and paste in the key in the PGP Public Key field
  5. Facebook will send you an encrypted notification. Mailvelope should turn your browser cursor into a golden key when you hover your cursor over the encrypted contents
  6. Tada!

You may also want to share your public key on keyservers like the MIT PGP Key Server or the PGP Global Directory. In principle, that will allow other people to send you encrypted email messages that only you can decrypt.

$7,500! Spark hackathon in Boston May 28-30

My team will be supporting the Spark hackathon in Boston on May 28-30.

This weekend’s a good chance to teach yourself Spark.

“Apache Spark is an open source processing engine built around speed, ease of use, and analytics. If you have large amounts of data that requires low latency processing that a typical Map Reduce program cannot provide, Spark is the alternative. Spark performs at speeds up to 100 times faster than Map Reduce for iterative algorithms or interactive data mining.”

Happy Memorial Day weekend!

How I made my Android Galaxy S3 phone run faster

My primary phone is a Samsung Galaxy S3 running Android 4.4.2 Kit Kat. It’s a little old at this point, but I’m disinclined to upgrade for the sake of upgrading. It was getting slower, so I’ve recently taken a number of steps to tune and optimize its performance.

Things I’ve done to make Android slower

1. Enable device encryption

If someone were to steal my phone without encryption, they would be able to hijack any number of my online accounts through email password resets. This is a frightening possibility, and the surest way to protect against it is to encrypt your device.

Device encryption would be mandatory if I chose to access work email on phone, but that is something I choose to avoid.

2. Encrypt microSD storage

Samsung Galaxy S2 through S5 were fantastic phones in that they have replaceable batteries and expandable storage. I’ve recently added a high performance 32GB microSD card to my phone, and sensibly encrypted it.

Things I’ve done to make Android faster

1. Replace Samsung keyboard with anything else

Ever since I purchased my phone, it’s had an infuriating multi-second delay in bringing up the Samsung touch keyboard. I’ve recently switched to the Google Keyboard available in the Google Play app store, and the difference is night and day. The Keyboard comes up instantaneously.

I’ve also heard great things about Swype.

2. Clear caches with CCleaner

Back when I was a Windows user, CCleaner was the one reputable, malware free application for tuning Windows. They have an Android version that does a good job of clearing the many caches and temporary files of your Android apps.

3. Delete all photos

Dropbox automatically backs up all of my photos, so there’s absolutely no reason to keep them on disk. Having a full file system on your Android phone reduces file system and encryption performance.

I went into the Gallery app and bulk-deleted all my old photos.

4. Move applications to external storage

The built-in storage on your phone is not as performant as a quality microSD card. Many applications will let you relocate them after installation to the microSD storage.

5. Disable animated transitions

You can enable developer mode on Android without jailbreaking.

Once you do, you can go into Settings > More > Developer options and disable all useless animations. This is something I’ve done in the past on other operating systems. On Android, I again got better responsiveness and minimal difference in visual experience.

6. Get an extended battery

Samsung phones other than the newest Galaxy S6 have user-serviceable batteries. That means you can easily purchase a replacement battery, an external spare battery charger, or an extended battery.

Since I’ve gotten an extended battery, my phone lasts two whole days on a single charge. This is fantastic for my user experience.

Going beyond

One thing I haven’t done is root or jailbreak my device. If you do jailbreak, you can uninstall all the bundleware cruft that Samsung puts on the phone.

Note that if you do intend to use your phone to access work email, there may be a policy against jailbreaking your device.

Installing DB2 10.1 on Mac OS X

It’s incredibly useful to have a local installation of DB2 on your Mac workstation for development and test purposes. I have a local installation to develop DB2-backed Ruby on Rails applications.

Here are the current instructions for installing DB2 on Mac OS X, courtesy of my colleague Kevin Rose:

Instructions to install DB2 v10.1 on Mac OS X Yosemite:

Prerequisite: XCode developer tools must be installed. These can be installed from the Mac App Store.

1. Ensure the following entries are in the /etc/sysctl.conf. Create the file /etc/sysctl.conf if it does not exist.

Restart your Mac after creating the file to make the values take effect.

2. Open a terminal with a shell for the the user that will become instance owner.

3. Ensure that otool is in the path. Execute otool:

If the error is “command not found” then run the following

4. Extract the DB2 install image from the tar archive:

The image will be extracted into an expc directory.

5. Enter the expc directory and run the installer and perform a non-root install:

This will install DB2 to the following default location: /Users/$(whoami)/sqllib

Execute step 6 if you need to enable connections for a userid other than the instance owner:

6. Enable OS authentication. (You need to be an Admin user to run these commands):

The instructions for starting DB2 and configuring remote access are the same as before.