CptCodeMonkey

Since friday I've been arguing with a project owner about the use of uuid1 in their project as I can rapidly and reliably cause uuid1 collisions in a single process in under 1 second of testing.

I wrote a test script here https://gist.github.com/devdave/5892749 that always fails in .05 to .09ths of a second.

I originally discovered this was happening when testing out cqlengine ( an ORM like interface to cassandra for python ) and opened an issue ticket. Here's the issue ticket - https://github.com/cqlengine/cqlengine/issues/82

I've gone down the line, isolating the issue to the gist, trying a pristine Ubuntu 12.04 instance, and still gotten the same results.

The source code for uuid1 in Python 2.7.3 is mirrored here https://github.com/certik/python-2.7/blob/master/Lib/uuid.py#L490

And I discovered after setting https://github.com/certik/python-2.7/blob/master/Lib/uuid.py#L500 `_uuid_generate_time` to None the collisions went away suggesting theres a problem in libuuid or more likely how Virtualbox implements /dev/random

Still this seems like a somewhat major gotcha that someone else should have at least run into before... right?

My dev stack: Virtualbox 4.2.10 r84104 Precise 32bit Ubuntu 12.04 LTS Python 2.7.3 #ldconfig -p | grep libuuid libuuid.so.1 (libc6) => /lib/i386-linux-gnu/libuuid.so.1

Currently upgrading virtualbox to see if its a VM implementation issue thats been resolved.

In the space of half a day, vision in my right eye deteriorated to the point that I can't even see an eye exam chart with it. I've already gone to the hospital and going back tomorrow for another round of tests. It's not a tumor, no signs of MS, no signs of infection.<p>I know they're are people considered legally blind that still write code, so how do they do it? Is there an OS that's better geared for accessibility, and are there any tools that can help make life easier?