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Why are only a few video games written in Java? [closed]
... best with:
The biggest problem is that Java is really slow. On a pure cpu / memory / display / communications level, most modern cell phones should be considerably better gaming platforms than a Game Boy Advanced. With Java, on most phones you are left with about the CPU power of an original 4....
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...han 32-bit? I always thought if there's less bits, there will be less bits CPU has to work on, thus faster. What am I missing here?
– Shane Hsu
Sep 3 '13 at 11:24
12
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How can I build a small operating system on an old desktop computer? [closed]
... you suggest any references to building those?
anything that isn't direct cpu/memory operations. Anything that isn't directly in the CPU reference manual.
After the booting sequence--then what? How do I get into protected mode etc.
Protected mode will be part of the boot sequence.
then you sta...
Perl build, unit testing, code coverage: A complete working example
...ful.
Files=1, Tests=18, 0 wallclock secs ( 0.00 cusr + 0.00 csys = 0.00 CPU)
To run your unit tests with code coverage analysis, try this:
Build testcover
And you'll see something on the order of this:
t\HelloPerlBuildWorld....ok
All tests successful.
Files=1, Tests=18, 12 wallclock secs ( ...
Performance differences between debug and release builds
... method. This is a big one, it makes property accessors essentially free.
CPU register allocation. Local variables and method arguments can stay stored in a CPU register without ever (or less frequently) being stored back to the stack frame. This is a big one, notable for making debugging optimiz...
Which is faster: while(1) or while(2)?
...story is:
There exists a layer of translation between C++ source code and CPU instructions, and this layer has important implications for performance.
Therefore, performance cannot be evaluated by only looking at source code.
The compiler should be smart enough to optimize such trivial cases. Progr...
What is the difference between JDK and JRE?
...va), the sole purpose of which is to run as fast as possible on the target CPU (virtual CPU of your JVM). Java code gets converted into several machine code instructions. Variables are shoved all over the place – into the stack, into registers, or completely optimized away. Structures and objects ...
Greenlet Vs. Threads
...l when there's a lot of work to be done in userspace, and that's typically CPU-heavy stuff. Concurrency is useful for breaking apart problems, enabling different parts to be scheduled and managed more easily in parallel.
Greenlets really shine in network programming where interactions with one sock...
Android: AsyncTask vs Service
...g: Android will not keep your app alive just because your app is using the CPU. It has to have some way of knowing that your app still has work to do; that's why Services are registered with the OS, and AsyncTasks aren't.
Multithreading
AsyncTasks are all about creating a background thread on whic...
Ternary operator is twice as slow as an if-else block?
...itional with 1000 iterations: 47710ms
My system details:
x64 i7-2720QM CPU @2.20GHz
64-bit Windows 8
.NET 4.5
So unlike before, I think you are seeing a real difference - and it's all to do with the x86 JIT. I wouldn't like to say exactly what is causing the difference - I may update the post ...