It is cheap, O(1). As you suspect the list is merely a wrapper around the array. This is confirmed by the Java API documentation: Returns a fixed-size list backed by the specified array. (Changes to the returned list “write through” to the array.)
Drepper’s What Every Programmer Should Know About Memory [pdf] is a good reference to one aspect of low-level optimisation.
which XSLT engine are you using? If you are using the .NET engine and Visual Studio you could use the XSLT profiler integrated into Visual Studio which is a very useful. Other excellent profiling tools are Altova’s XML Spy and Oxygen. If you would post your XSLT it would be easier to tell you where … Read more
Yes, of course this is possible. When dragging multiple files on a batch file you get the list of dropped files as a space-separated list. You can verify this with the simple following batch: @echo %* @pause Now you have two options: PngCrush can already handle multiple file names given to it on the command … Read more
I think the comparison with true shows a lack of understanding by your partner. Bools should be named things to avoid this (such as isAvailable: if (isAvailable) {…}).
There’s few very simple steps to achieve a faster application. There’s three things that can always be considered. ZF2 Performance QuickTipp #1 – ViewModels Always manually assign the fully qualified script to render. This will increase the performance a little. It’s done like this: public function someAction() { $viewModel = new ViewModel(); $viewModel->setTemplate(‘MODULE / CONTROLLER … Read more
POSIX Clocks I wrote a benchmark for POSIX clock sources: time (s) => 3 cycles ftime (ms) => 54 cycles gettimeofday (us) => 42 cycles clock_gettime (ns) => 9 cycles (CLOCK_MONOTONIC_COARSE) clock_gettime (ns) => 9 cycles (CLOCK_REALTIME_COARSE) clock_gettime (ns) => 42 cycles (CLOCK_MONOTONIC) clock_gettime (ns) => 42 cycles (CLOCK_REALTIME) clock_gettime (ns) => 173 cycles (CLOCK_MONOTONIC_RAW) … Read more
Please remember the rules of Optimization Club: The first rule of Optimization Club is, you do not Optimize. The second rule of Optimization Club is, you do not Optimize without measuring. If your app is running faster than the underlying transport protocol, the optimization is over. One factor at a time. No marketroids, no marketroid … Read more
I haven’t tested this, but it seems like one possible workaround is to have multiple properties that all return the same thing. Conceivably you could then get 28 inlines per property. Note that the number of times a method is inlined most likely depends on the size of native code for that method (See http://blogs.msdn.com/b/vancem/archive/2008/08/19/to-inline-or-not-to-inline-that-is-the-question.aspx), … Read more