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Java tips&tricks
A couple of quick/short Java tips: The Collections.unmodifiable* just wrap the original object in a facade class which throws UnsupportedOperationException when you invoke operations that would modify it (like add or remove), but the original collection still remains mutable (and the mutations are reflected in facade object). This might be obvious to some, but not…
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Comparing CVS revision numbers with Perl
Update: see a faster version here. However, make sure that you’ve nailed the problem down before starting to optimize. (The profiler is your friend) The code below was only lightly tested and isn’t all that efficient, so use it at your own risk. It returns –1 is the first version is smaller, 1 if it…
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Quirky Perl tricks
Perl is like a sharp knife: you can do a lot of things with it easily (like carve wood), but you easily hurt yourself. So here are some quirky things which I discovered (credit goes to my friends who came to me with these issues and helped me to grow my knowledge by researching the…
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Removing features is the best defense
When I’ve read the news that Microsoft is disabling Autorun for removable media other than CD/DVD in Windows 7 (and maybe HD-DVD/BlueRay) I said: cool! This will slow down the spreading of malware using this feature (on a very long timeframe of course, because Windows 7 isn’t even final yet – and far away from…
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Is Java slower than C? (and does it matter?)
Via daniel’s blog (the creator of curl) I arrived to this page: why the Java implementation (JGit) doesn’t run nearly as fast as the C implementation. The short version of it is: even after many tunings JGit is twice as slow as the C implementation. One of the problems which got my attention, was the…
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Weird RVRD issue explained
Dear reader. This is a highly specific description of a problem related to the Tibco RV (Rendezvous) product and chances are that it is of no interest to you. If this is the case, feel free to skip it. I’ve wanted to document it here, so that other people searching about this problem can find…
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Toying around with andLinux
I don’t remember exactly where I heard about it (although I seem to remember that it was on the Ubuntu UK Podcast). andLinux is a package based on coLinux (Cooperative Linux), which in turn is a port of the Linux kernel to the Windows platform. How does that work? The short (and somewhat inaccurate) description…
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Database links
Via the MySQL performance blog: the Percona 2009 conference posted the slides (most of them anyways). There is some very good and diverse material in there (not necessarily MySQL specific). I also found the following link in one of the presentations: http://omniti.com/does/postgresql – love it! Testing Disk Speed: the dd Test – I/O is the…
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Using Procmon for finding malware
The scenario is: you know you are infected, because you’ve identified a process associate with a malware, but you can’t figure out how that given process is getting launched. A variation of this is: you kill the process, remove the executable but it reappears after a given amount of time / after reboot / etc.…
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Oracle buys Sun (and gets MySQL)
Here is Monty’s (co-founder of MySQL, left SUN some time ago) opinion. On a more light-hearted note, here are some Slashdot comments 🙂 Fro rho – a good example for why case sensitivity is important: > Their string comparisons are case sensitive. 8.4 has citext. Or you can make an index with lower() on the…