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Algorithm for creating a school timetable
... classes split in sub-groups some of the time?, Is this a weekly schedule? etc.) there isn't a well known problem class which corresponds to all the scheduling problems. Maybe, the Knapsack problem has many elements of similarity with these problems at large.
A confirmation that this is both a har...
What is a memory fence?
...
For performance gains modern CPUs often execute instructions out of order to make maximum use of the available silicon (including memory read/writes). Because the hardware enforces instructions integrity you never notice this in a single thread of execut...
If threads share the same PID, how can they be identified?
...ad ID's are usually managed by the thread library itself (such as pthread, etc...). If the 4 threads are started they should have the same PID. The kernel itself will handle thread scheduling and such but the library is the one that is going to be managing the threads (whether they can run or not de...
What is an SDL renderer?
...lds all info about the Window itself: size, position, full screen, borders etc.
SDL_Renderer
SDL_Renderer is a struct that handles all rendering. It is tied to a SDL_Window so it can only render within that SDL_Window. It also keeps track the settings related to the rendering. There are several ...
Does async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation
...
And native, on my MacBook Pro 15" (Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz) with Apple LLVM version 10.0.0 (clang-1000.10.44.4) under OSX 10.13.6, I get this:
Do nothing calls per second: 22078079
Empty calls per second: 21847547
New thread calls per second: 433...
What's the difference between unit, functional, acceptance, and integration tests? [closed]
...s
Access the network
Hit a database
Use the file system
Spin up a thread
etc.
Any kind of dependency that is slow / hard to understand / initialise / manipulate should be stubbed/mocked/whatevered using the appropriate techniques so you can focus on what the unit of code is doing, not what its d...
Android destroying activities, killing processes
...istent data, stop animations and other things that may be
consuming CPU, etc. Implementations of this method must be very quick
because the next activity will not be resumed until this method
returns. Followed by either onResume() if the activity returns back to
the front, or onStop() if it ...
What are bitwise operators?
...lculations.
operations:
bitwise AND
bitwise OR
bitwise NOT
bitwise XOR
etc
List item
AND|0 1 OR|0 1
---+---- ---+----
0|0 0 0|0 1
1|0 1 1|1 1
XOR|0 1 NOT|0 1
---+---- ---+---
0|0 1 |1 0
1|1 0
Eg.
...
Does Python support multithreading? Can it speed up execution time?
...tween threads.
What the GIL prevents then, is making use of more than one CPU core or separate CPUs to run threads in parallel.
This only applies to Python code. C extensions can and do release the GIL to allow multiple threads of C code and one Python thread to run across multiple cores. This ext...
How does the new automatic reference counting mechanism work?
...ually decide to look at everything it can find starting from the stack and CPU registers. It will never find A,B1,B2,B3 so it will finalize them and recycle the memory into other objects.
When you use ARC or MRC, and finish with A it have a refcount of 3 (B1, B2, and B3 all reference it), and B1/...