As soon as I saw a Flame Graph visualization I knew it would make a great addition to NYTProf. So I’m delighted that the new Devel::NYTProf version 5.00, just released, has a Flame Graph as the main feature of the index page.
In this post I’ll explain the Flame Graph visualization, the new ‘subroutine calls event stream’ that makes the Flame Graph possible, and other recent changes, including improved precision in the subroutine profiler. Continue reading
I expressed this idea recently in a tweet and then started writing it up in more detail as a comment to Brendan Byrd’s The Four Major Problems with CPAN blog post. It grew in detail until I figured I should just write it up as a blog post of my own. Continue reading
For a long time I’ve wanted to create a module that would shed light on how perl uses memory. This year I decided to do something about it.
My research and development didn’t yield much fruit in time for OSCON in July, where my talk ended up being about my research and plans. (I also tried to explain that RSS isn’t a useful measurement for this, and that malloc buffering means even total process size isn’t a very useful measurement.) I was invited to speak at YAPC::Asia in Tokyo in September and really wanted to have something worthwhile to demonstrate there.
I’m delighted to say that some frantic hacking (aka Conference Driven Development) yielded a working demo just in time and, after a little more polish, I’ve now uploaded Devel::SizeMe to CPAN.
In this post I want to introduce you to Devel::SizeMe, show some screenshots, a screencast of the talk and demo, and outline current issues and plans for future development. Continue reading
This is the text of a speech I originally wrote for the International Speech Competition at my Toastmasters club in April 2012. (I won the club competition and came second in the area competition a week or so later.)
In July I gave a slightly modified version, reproduced here, as a 5 minute Lightning Talk at OSCON in Portland OR. Continue reading
A key part of my plan for Upgrading from Perl 5.8 is the ability to take a perl library installed for one version of perl, and reinstall it for a different version of perl.
To do that you have to know exactly what distributions were installed in the original library. And not just which distributions, but which versions of those distributions.
I’ve a solution for that now. It turned out to be rather harder to solve than I’d thought… Continue reading
- You have a production system, with many different kinds of application services running on many servers, all using the perl 5.8.8 supplied by the system.
- You want to upgrade to use perl 5.14.1
- You don’t want to change the system perl.
- You’re using CPAN modules that are slightly out of date but you can’t upgrade them because newer versions have dependencies that require perl 5.10.
- The perl application codebase is large and has poor test coverage.
- You want developers to be able to easily test their code with different versions of perl.
- You don’t want a risky all-at-once “big bang” upgrade. Individual production installations should be able to use different perl versions, even if only for a few days, and to switch back and forth easily.
- You want to simplify future perl upgrades.
I imagine there are lots of people in similar situations.
In this post I want to explore how I’m tackling a similar problem, both for my own benefit and in the hope it’ll be useful to others. Continue reading
For the past year I’ve been rather distracted, with little time to devote to Open Source projects. I’ve been working on a different kind of project, adding an extension to our home. It’s been quite a journey.
After much planning (the plumbing Statement of Works, for example, covers four pages), and our fair share of trials and tribulations, the builders broke ground two weeks ago. Now, after days of digging and rock-breaking, the foundations trenches are all dug out and the concrete will be poured tomorrow morning. Finally, we’ll be “out of the ground”.
Naturally I want to be around to handle issues as they arise, so this year I won’t be going to OSCON or YAPC::EU. If all goes well we should be completed in time for me to attend the London Perl Workshop in November.
Meanwhile I hope to find a little time for catching up on outstanding issues with DBI and NYTProf and perhaps a little more blogging.