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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...ce on a map-reduce calculation by turning that core off.
Here my guess is contention for integer units: that the popcnt, loop counter, and address calculations can all just barely run at full speed with the 32-bit wide counter, but the 64-bit counter causes contention and pipeline stalls. Since the...
What is the difference between a mutable and immutable string in C#?
...ata fields that can be altered. One or more of its methods will change the contents of the object, or it has a Property that, when written into, will change the value of the object.
If you have a mutable object- the most similar one to String is StringBuffer- then you have to make a copy of it if y...
What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?
...Error
Error code:
422 Unprocessable Entity
The server understands the content type of the request entity (hence a 415 Unsupported Media Type status code is inappropriate), and the syntax of the request entity is correct (thus a 400 Bad Request status code is inappropriate) but was unable to pro...
Differences between Octave and MATLAB? [closed]
I'm a programmer who knows Python, Ruby and some C who is trying to decide whether to learn GNU Octave or Matlab. I know that they have a lot in common , but it isn't clear to me how similar the syntax is or even the data structures are. The above link shows several m>ex m>amples where they are syntacti...
Building and running app via Gradle and Android Studio is slower than via Eclipse
I have a multi-project (~10 modules) of which building takes about 20-30 seconds each time. When I press Run in Android Studio, I have to wait every time to rebuild the app, which is m>ex m>tremely slow.
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How does the new automatic reference counting mechanism work?
Can someone briefly m>ex m>plain to me how ARC works? I know it's different from Garbage Collection, but I was just wondering m>ex m>actly how it worked.
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Is inline assembly language slower than native C++ code?
I tried to compare the performance of inline assembly language and C++ code, so I wrote a function that add two arrays of size 2000 for 100000 times. Here's the code:
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Program only crashes as release build — how to debug?
...ld check your code for uninitialized variables. This can also apply to the contents of arrays.
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How to grep (search) committed code in the Git history
...eted a file or some code in a file sometime in the past. Can I grep in the content (not in the commit messages)?
15 Answers...
Add table row in jQuery
... one yourself.
DaRKoN_ suggests appending to the tbody rather than adding content after the last tr. This gets around the issue of having no rows, but still isn't bulletproof as you could theoretically have multiple tbody elements and the row would get added to each of them.
Weighing everything up...