OS X Mirroring and External Displays

I have a not-superfancy 21″ iMac at home. It’s got an old Dell 24″ DVI display attached with a Thunderbolt adapter. I’m generally a big fan of multiple displays on any computer I’m using, and this works out well when I want it, especially if I’m doing something with VMware Fusion that could use a full extra screen. But here’s the thing: In this particular setting, I don’t need or want the external display all the time. It’s connected via VGA to an old Mac mini that we occasionally use, which complicates things a bit more because of input switching. The display is from something like 2007, so it does nothing automatically.

No problem: If I don’t need it, I’ll just turn it off. However, the Thunderbolt adapter means that OS X always sees the display as present, even if it’s powered off. I find this annoying, especially when I launch an application that remembers it has windows on the external display. I have to turn the display on, make sure it’s on the DVI input, blah blah, just to move the window. It’s a small thing, but the grumpy accumulates.

Today, the obvious solution finally occurred to me: Just turn on display mirroring when the external display is unwanted. Command-F1, or Command-fn-F1 if you have media keys disabled.

This gathers everything to the internal iMac display and means OS X (and I) can just ignore the second display. Easy.

I Did Not Know: xargs -n and -P

Say you need to md5sum 46 files, all ending in “.foo” in a single directory. You might use your standard `md5sum *.foo > md5sum.txt` command to checksum them all in one process. Get coffee, it’s done, move on.

Oh, I should mention those 46 files are a little under 6 terabytes in total size. The standard command might take a while. I drink a lot of coffee, but whoa.

Now imagine you have a 16 core server connected via modern InfiniBand to an otherwise idle pre-production parallel filesystem with several hundred disks and multiple controllers, each with their own cache. The odds are tilting in your favor. This is especially true if you read up on this pair of options in xargs(1), which inexplicably, shamefully, I Did Not Know:

--max-args=max-args, -n max-args
       Use at most max-args  arguments  per  command  line.
       Fewer  than  max-args  arguments will be used if the
       size (see the -s option) is exceeded, unless the  -x
       option is given, in which case xargs will exit.
--max-procs=max-procs, -P max-procs
       Run up to max-procs processes at a time; the default
       is 1.  If max-procs is 0, xargs  will  run  as  many
       processes  as possible at a time.  Use the -n option
       with -P; otherwise chances are that  only  one  exec
       will be done.

Sure, I could have run this on more than one such machine connected to the same filesystem. There are a number of tools that can split up work across multiple child processes on a single machine, none of which were installed in this environment. I wanted to see what I could get this single server to do with basic commands.

46 files / 16 cores = 2.875, so let’s give this a shot:

find . -type f -name "*.foo" | xargs -P 16 -n 3 md5sum | tee md5sum.out

English: For the files ending in “.foo” in this directory, run md5sum up to 16 times in parallel with up to three files per run, show results as they happen, and save the output.

Please Note: This will absolutely not help unless you have the storage infrastructure to handle it. Your Best Buy hard drive will not handle it. It has a strong chance of making your machine unhappy.

In this case, I got something lovely from top:

29394 R 100.0 md5sum
29396 R 100.0 md5sum
29397 R 100.0 md5sum
29398 R 100.0 md5sum
29399 R 100.0 md5sum
29400 R 100.0 md5sum
29401 R 100.0 md5sum
29402 R 100.0 md5sum
29403 R 100.0 md5sum
29391 R 99.6 md5sum 
29392 R 99.6 md5sum 
29393 R 99.6 md5sum 
29395 R 99.6 md5sum 
29404 R 99.6 md5sum 
29405 R 99.6 md5sum 
29406 R 99.6 md5sum

Early on, there were some D states waiting for cache to warm up, and CPU dropped below 70% for one or two processes, but I’ll take it. I’ll especially take this:

real    31m33.147s

Right on, xargs. Easy parallelization on one system for single file tasks driven from a file list or search.

Good Software Practices Scale Down

Today I revisited some scripts I last touched on December 5, 2011 for very very carefully archiving research data with checksums, an audit trail, and other very very careful things like that.

One of the requirements for this project is that the first phase of my processing needs to accept input data from a provider. Unfortunately, this input format has never been the same twice. Grr.

Upon receipt of the second variation on July 12, 2011 (six days after I started the project), I took the time to make the script somewhat configurable with an external file.

This was handy in November 2011 when I needed to do a similar set of work for a second research dataset. I put everything in a configuration file stored alongside the input data. Date format strings, headers, fields of interest, key/values for data types, etc. That meant I could share code between datasets as they emerged from the wild.

So last week, I got another set of input data. Yep, another unique format. I haven’t thought about this in over a year, and I have a terrible memory. Today, I got the input data parsed and validated in five minutes after editing a config file, because:

  1. I had one place to do customization
  2. I took steps to encourage code reuse
  3. I wrote good comments and gave myself a -h option

All this despite knowing that I was probably the only one who would ever look at this again. And I have those dates because everything is in a Subversion repository. Did I mention that I wrote it in a language I don’t know very well?

Granted, this is a tiny little thing in the universe of computer things, but my point here is that it’s often worth doing the right thing for the next guy, even for small things, even if the next guy is you. Perhaps especially if it’s you.

No Solaris 11 for Legacy UltraSPARC

I don’t do a lot of Solaris anymore, and though I’m interested in several of the new features in the upcoming Solaris 11, I wasn’t aware until today that it wouldn’t run on most legacy UltraSPARC systems:

Support for legacy systems that have included the UltraSPARC I, II, IIe, III, IIIi, III+, IV and IV+ processor architectures (as reported by the Solaris ‘psrinfo -pv’ command) has been removed. All Oracle SPARC Enterprise M-Series Servers and Oracle SPARC T-Series Servers will continue to be supported.

Source: http://www.oracle.com/technetwork/systems/end-of-notices/eonsolaris11-392732.html

I’ve always liked the T-Series systems, and have personally achieved what I consider impressive workload consolidation using a few of them. It’s not entirely clear what Oracle means with the above statement, but rumor is that support for the sun4u architecture is gone. That’s a big change from the Solaris 11 Express HCL. I imagine there are lots of places where this means “we will never ever run Solaris 11.”

Reminds me of a certain fruit company. Time marches on.

The New Apple TV

We have a new Apple TV. Herein, my experience.

It’s almost ridiculously small. Considering it’s basically a TV-connected 8GB iPod Touch, that’s not a surprise, but next to a Playstation 3 and 52″ TV, it’s nearly invisible. I really appreciate the lack of a power brick. It has a 6W power supply, which is maybe 1/16 what the PS3 requires.

Note that the Apple TV is connected via Ethernet to an Airport Extreme, which is connected via Ethernet to a cable modem on Comcast. Also connected via Ethernet to that Airport Extreme: the aforementioned PS3 and a Mac mini, which would ideally be on its way out of the den and into my office, but apparently not just yet.

Also note: no cable or satellite TV at our house, just Comcast data. We had Comcast WHATEVER_PACKAGE_SUPERB for the initial six months after the cable modem showed up, but never watched anything other than things we could already stream online. I have no interest in paying for traditional television service because it’s packed to the very top with Idiocracy-style nonsense.

But good TV, we like. We watch it (completely legally) via The Intarnet.

Apple ID

You use your Apple ID to turn on Home Sharing so the Apple TV can access content on iTunes from a computer on your network. I was immediately frustrated because my Apple ID had a space in the username, but the on-screen keyboard for the Apple TV doesn’t include a space character. I tried a few things, got frustrated, and used the Apple ID site to give in and change my Apple ID to an email address. This made me a bit sad; my Apple ID has been around for a long time and I had to go change it on all my devices. Once changed, the Apple TV set up fine and I could see iTunes stuff from the Mac mini. Bittersweet.

iTunes Content

I have a Season Pass on the iTunes Store for Mad Men. It downloads on the Mac mini. It shows up nicely on the Apple TV. It also manages to mark viewed content as viewed, which is very nice. I ranted for around five minutes the other day while walking to lunch about how annoying it is to play content stored in iTunes on Computer A (master) using iTunes sharing from Computer B. In my experience, metadata like played/unplayed, play counts, ratings, etc. doesn’t get updated on Computer A, which makes it much less useful. I know why this is, but it bugs me, especially for podcasts. The Apple TV appears to do this, at least for purchased TV.

I haven’t rented anything directly on the Apple TV. I don’t know if I’ll do that anytime soon, since most of the movies I want to watch are on Netflix and most of the shows are on Hulu. Most of both are Not Available for rental from the iTunes Store.

Songs, podcasts, my own non-iTunes Store videos stored in iTunes, etc. all played back fine on the Apple TV. Unless I find otherwise, my assumption is that if iTunes can play it, it can show up on the Apple TV. Works for me.


The new Apple TV is much better as a Netflix player than the PS3 because there’s no fan, no disc (though that goes away this month, I hear), and both startup times and responsiveness are much better. It’s just a few seconds from selecting “Netflix” to hearing “Previously on Veronica Mars…”

One thing I don’t like: a few times while streaming Netflix video, it’s suffered from a cycle like this:

  1. Playback freezes for maybe ten seconds
  2. Playback resumes for five or ten seconds
  3. Repeat

This has only happened during a weekend night, but I don’t know if that’s significant. The last time it happened, I immediately switched to the Mac mini running Safari, netflix.com, and the Silverlight-based player, and saw no further hiccups. That makes me think there’s something different about the Apple TV (either its software or the Netflix backend it requires) that caused the issue. Annoying.


Ha! It doesn’t do Hulu. The Mac mini seems like it might have to stay put. Hulu Plus is not the answer for me, and I don’t know what answer it provides to anyone who doesn’t want to watch back episodes of The X-Files on their iPad. (Not that there’s anything wrong with that.)

Hulu itself is great for watching recent shows, but Hulu Plus requires a subscription payment to still show you ads and not allow you to watch content you’re used to seeing on a mobile or TV-connected device. (Unless you have a Mac mini on your TV…)

It is deeply stupid to have to think about what device and signal path I have to use to watch an episode of freaking Glee.

I am well aware that the Apple TV will probably never let me view Hulu content without jailbreaking. I have made my peace with this.

Internet Radio

I listen to Groove Salad. It is great. It is a simple menu item on my TV now. This is awesome.


It’s very easy to flip through pictures and slide shows from Flickr contacts. Images look nice and the UI is very responsive.

Except for those two times it crashed and the Apple TV had to reboot.


I watched video from my friend Steven Bryant. I generally dislike actually using YouTube, but this looked good, was more or less easy to navigate, and provided a much more elegant experience than the YouTube web site or iOS app.

Except for that one time it crashed and the Apple TV had to reboot.

The Remote App

The updated Apple Remote app is on my iPhone. The gestures to control the Apple TV are not entirely intuitive, but the basics are fine. The big win is being able to use your iPhone to type on-screen, because using the IR remote is just as horrid as any other similar input method.


  • I haven’t noticed a method to control volume. This is good. Controlling volume in one place (the AV receiver) is much more intuitive and results in less frustration compared to the three places (app, OS, receiver) that I get with the Mac mini.
  • 100Base-T is all you get with the Apple TV. It’s meaningless, but I don’t know if Apple sells anything else without Gigabit Ethernet.
  • You have to use a dedicated menu item in iTunes (Advanced -> Choose Photos To Share…) to select images you’d like to view on the Apple TV. It seems weird, but since you never plug the Apple TV in (unless it’s broken), I guess the normal interface of select device, then select options wouldn’t work.
  • I mean it: it’s comically small.

I don’t regret the purchase, especially at $99. I’d like a few rough edges smoothed out, and I don’t know what to do about Hulu. I know there are other teeny-tiny media-to-TV devices on the market these days, but this is the one I have and it’s been good overall.