This post is partially inspired by Braulio Bhavamitra's comments about Ruby being faster when compiled with Clang rather than GCC and partially by Brendan Gregg's comments about compiler optimisation during his Flame Graphs talk at USENIX LISA13 (0:33:30). In short I wanted to look at what kind of performance we are leaving on the table … Continue reading Benchmarking Ruby with GCC (4.4, 4.7, 4.8, 4.9) and Clang (3.2, 3.3, 3.4, 3.5)

When working with EC2 instances across multiple regions I've found it's near impossible to get a good overview of what is running where. This can be especially annoying when you are automatically launching a number of short lived instances. To prevent me having to go through 9 different web pages to see what I currently … Continue reading Listing EC2 instances in all regions

Get sources: Install dependencies: Patch Vagrant[1][2][3]: Test and install: [1]: Without this patch Vagrant will give the following warning: [2]: Without this patch Vagrant will give the following error: [3]: Without this patch Vagrant will give an error when running in a directory containing a Gemfile.

VMware's ESXi 5.5 increases the recommend memory requirement from 4GB to 8GB, their own System Requirements document stating that: "You have 4GB RAM. This is the minimum required to install ESXi 5.5. Provide at least 8GB of RAM to take full advantage of ESXi features and run virtual machines in typical production environments." However when … Continue reading VMware ESXi MEMORY_SIZE_ERROR