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Difference between wait() and sleep()
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@Geek - why in the world do you say wait() wastes CPU cycles?
– Robert Munteanu
Jun 24 '09 at 7:04
26
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What are the pros and cons of performing calculations in sql vs. in your application
...tatements to avoid unnecessary data access)
don't push the database to its CPU limits with complex, concurrent calculations (in favour of pulling data into application memory and performing calculations there)
In my experience, with a decent DBA and some decent knowledge about your decent database...
What is data oriented design?
...rformance. This will only increase in importance as the difference between CPU and RAM speed widens.
How to layout the memory
In my ball example I simplified the issue a lot, because usually for any normal app you will likely access multiple variables together. E.g. position and radius will probab...
How are everyday machines programmed?
...have 8 or 16 pins on the chip - compared to scores of pins in your regular CPU socket.
So the workflow is write some code (say, in C), compile it on your desktop machine. That compiler generates machine code for the embedded chip. Then that code is loaded onto the microprocessor (and you need speci...
Can I use view pager with views (not with fragments)
....getView(context, collection);
break;
case 2:
view = CpuView.getView(context, collection);
break;
}
collection.addView(view);
return view;
}
@Override
public int getCount() {
return 3;
}
@Override
public boolean isViewFromObject(View view,...
Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...t used. C implementations usually used the same representation used by the CPU - so the overflow behavior followed from the integer representation used by the CPU.
In practice, it is only the representations for signed values that may differ according to the implementation: one's complement, two's c...
How dangerous is it to access an array out of bounds?
...user privileges, a malfunctioning program can consume excessive resources (CPU, memory, disk), possibly bringing down the entire system. A lot of malware (viruses, etc.) exploits buffer overruns to gain unauthorized access to the system.
(One historical example: I've heard that on some old systems ...
Check synchronously if file/directory exists in Node.js
...nchronous calls. Calls into the I/O subsystem take significant time from a CPU's point of view. Note how easy it is to call lstat rather than lstatSync:
// Is it a directory?
lstat('/the/path', function(err, stats) {
if (!err && stats.isDirectory()) {
// Yes it is
}
});
Bu...
Why is f(i = -1, i = -1) undefined behavior?
...signment cannot be interleaved. It might be optimal to do so, depending on CPU architecture. The referenced page states this:
If A is not sequenced before B and B is not sequenced before A, then
two possibilities exist:
evaluations of A and B are unsequenced: they may be performed in ...
Fastest sort of fixed length 6 int array
... are single cycle instructions like add/subtract), but for a normal scalar CPU your method looks better.
– Paul R
May 8 '10 at 16:13
2
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