Got a secret project on machine A and too cheap to get a Github private repo? Clone it directly on machine B with: $ git clone ssh://user@A/absolute/path/to/repo/ Replace “user” with your username on A, “A” with the actual hostname of A, and “/absolute/path/to/repo/” with the absolute path to the git repository.
Having readahead set too high can slow your database to a crawl. This post discusses why that is and how you can diagnose it. The #1 sign that readahead is too high is that MongoDB isn’t using as much RAM as it should be. If you’re running Mongo Monitoring Service (MMS), take a look at [...]
Disk IO is slow. You just won’t believe how vastly, hugely, mind-bogglingly slow it is. I mean, you may think your network is slow, but that’s just peanuts to disk IO. The image below helps visualize how slow (post continues below). (Originally found on Hacker News and inspired by Gustavo Duarte’s blog.) The kernel knows [...]
I’m trying something new: every Thursday I’ll do a short post on how to do something with the command line. I always seem to either create or apply patches in the wrong direction. It’s like stalagmites vs. stalactites, which I struggled with until I heard the nemonic: “Stalagmites might hang from the ceiling… but they [...]
I’m trying something new: every Thursday I’ll go over how to do something with the command line. Let me know what you think. If you are using a modern-ish browser, you probably use tabs to keep multiple things open at once: your email, your calendar, whatever you’re actually doing, etc. You can do the same [...]
When you run a process, it needs some memory to store things: its heap, its stack, and any libraries it’s using. Linux provides and cleans up memory for your process like an extremely conscientious butler. You can (and generally should) just let Linux do its thing, but it’s a good idea to understand the basics [...]
It’s not a clean victory, but I got Linux onto my MacBook Air. When I first got my Air, I launched the Ubuntu install disk and followed the instructions on the Ubuntu wiki. Unfortunately, these instructions are apparently for the MacBook Air 1,1, and I had a MacBook Air 2,1. The Linux kernel froze in [...]
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