By Benjamin J Evans, James Gough
At present, no books exist that target the practicalities of Java software functionality tuning, in place of the speculation and internals of Java digital machines. This sensible advisor is the "missing link" that goals to maneuver Java functionality tuning from the world of guesswork and folklore to an experimental technological know-how. easy methods to strategy functionality difficulties in an constant and systematic approach; unravel construction functionality matters via studying center Java functionality subject matters; establish and unravel functionality matters earlier than encountering them in construction; comprehend the functionality difficulties you stumble upon via studying the Java platform's internals.
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Extra resources for Optimizing Java: Practical Techniques for Improved Performance Tuning
The software platforms that run on that hardware has also increased in complexity to exploit the new capabilities, so whilst software has far more power at its disposal it has come to rely on complex underpinnings to access that performance increase. The net result of this huge increase in the performance available to the ordinary application developer has been the blossoming of complex software. Software applications now pervade every aspect of global society. info CHAPTER 3: Hardware & Operating Systems Software is eating the world.
Let’s look at an example to see how this works with a real syscall. A very common Unix system call is gettimeofday(). This returns the “wallclock time” as understood by the operating system. Behind the scenes, it is actually just reading a kernel data structure to obtain the system clock time. As this is side-effect free, it does not actually need privileged access. If we can use vDSO to arrange for this data structure to be mapped into the address space of the user process, then there’s no need to perform the switch to kernel mode, and the refill penalty shown in Figure 3-6 does not have to be paid.
We will also catalogue some common best practices (and antipatterns) in the performance space.