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What is the performance cost of having a virtual method in a C++ class?
...predicted. This can cause a large pipeline bubble as the processor cannot fetch any instructions until the indirect jump (the call through the function pointer) has retired and a new instruction pointer computed. So, the cost of a virtual function call is much bigger than it might seem from looking ...
HashSet vs. List performance
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@hypehuman the CPU cannot work directly on data in the system memory but pulls in data from the memory into its cache to work on. There is a significant delay between the request for memory to be moved and the memory actually arriving so th...
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...
Timer & TimerTask versus Thread + sleep in Java
...And it deals better with multithreading issues (such as avoiding deadlocks etc.). And of course it is usually better to use well-tested standard code instead of some homemade solution.
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impro...
Which parallel sorting algorithm has the best average case performance?
...ld):
Parallel sorting pattern
Many-core GPU based parallel sorting
Hybrid CPU/GPU parallel sort
Randomized Parallel Sorting Algorithm with an Experimental Study
Highly scalable parallel sorting
Sorting N-Elements Using Natural Order: A New Adaptive Sorting Approach
Update for 2013:
Here is the ble...
Implement C# Generic Timeout
...s no where near as bad as a process running out of control and using every CPU cycle & byte of memory that the PC has. But you are right to point out the potential problems to anyone else who may think this code is useful.
– chilltemp
Nov 19 '08 at 15:37
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What happens to a declared, uninitialized variable in C? Does it have a value?
...avior instead of simply "undefined/arbitrary value", there are a number of CPU architectures that have additional flag bits in their representation for various types. A modern example would be the Itanium, which has a "Not a Thing" bit in its registers; of course, the C standard drafters were consid...
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 ...
Macro vs Function in C
...hort _square_us(unsigned short a) { return a * a; }
/* ... long, char ... etc */
#define square(a) \
_Generic((a), \
float: _square_fl(a), \
double: _square_dbl(a), \
int: _square_i(a), \
...
Foreign keys in mongo?
...lumns are Fields... Just in case you get mixed up.
– cpu_meltdown
Jun 2 '16 at 13:39
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