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    G-AVLN in front of her home

    G-AVLN in front of her home

    Mostly Unix and Linux topics. But flying might get a mention too.

    Thursday, February 06, 2014

    B-tree wins

    RHEL 7 will use xfs as its default filesystem type.

    That probably seals the fate for the ext* family of filesystems for commercial installations. No doubt smaller distributions will stick to ext3 or ext4, but once Red Hat moves on, many others will follow. Mind you, it'll be interesting to see what strategy Oracle might adopt, in their quest of making btrfs the standard.

    Either way, a b-tree based filesystem has now pushed out the outdated "pointer and list" technology.

    I wish I could draw

    Pete, my 'other half', who is a hardware engineer, got home last night screaming: "I hate software". He is embarking onto a new project (automating and electronics disciplines) which requires a use of a PIC processor. The processor can be programmed using a version of PIC Basic, and you can download a full PC programming environment software for it.

    Well, Pete was having problems with debugging a program, and he was getting really frustrated with it. His view is that when you get a hardware problem, you can methodically analyse it using a meter, scope or a logic analyser - and normally you can 'easily' find where and what went wrong. With software, if things go wrong, it's difficult to identify the source of the problem. Especially in his kind of programming, where you use a PC to write and compile a program, then you upload it into the kit, normally down the serial port. Problem is that it can take a long time to get to the bottom of it, as a successful execution of the program in the PC environment doesn't necessarily mean that it will behave in the target processor environment.

    Why do I wish I could draw? Well, there is that joke amongst the software people that when a user calls with a problem, the problem is perceived to be between the seat and the keyboard. And so, as Pete was describing yesterday his frustration, I built up a picture in my head of a hardware engineer trying to debug the program by holding a meter in his hand, with the two probes touching the seat and the keyboard...

    Wednesday, February 05, 2014

    Voltron: The marriage of Red Hat and CentOS

    When RHEL 7 release notes were published, a hot topic was that Red Hat will start supporting CentOS. That was great news in its own right.

    Today, the announcement took it one step further: the operations will merge!

    Considering that the two could have been fighting each other to destruction, it is truly remarkable that they chose to pull their efforts together. In my opinion it will be a win-win for all parties, including the customers, of course!


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