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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...gisters to the variables.
In your case, the speeds are a direct result of what is stuck to the (false) dependency chain depending on what the register allocator decided to do.
13 GB/s has a chain: popcnt-add-popcnt-popcnt → next iteration
15 GB/s has a chain: popcnt-add-popcnt-add → next iter...
what is the most efficient way of counting occurrences in pandas?
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What about counting over the entire DataFrame? This works for one column.
– Vaidøtas I.
Jan 23 at 8:49
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node.js global variables?
...ow in Java you do import com.foo.bar;. This makes it easier to figure out what your code is doing because the linkages between files are 'explicit'. Mildly annoying, but a good thing. .... That's the preaching.
There is an exception to every rule. I have had precisely exactly ONE instance where...
kernel stack and user space stack
What's the difference between kernel stack and user stack? Why kernel stack is used? If a local variable is declared in an ISR, where it will be stored? Does each process has its own kernel stack? Then how the process coordinates between both these stacks?
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Fastest Way of Inserting in Entity Framework
...tate Unchanged. It is the growing size of attached entities in the context what slows down the insertion step by step. So, it is helpful to clear it after some time.
Here are a few measurements for my 560000 entities:
commitCount = 1, recreateContext = false: many hours (That's your current...
What is the maximum possible length of a .NET string?
What is the longest string that can be created in .NET? The docs for the String class are silent on this question as far as I can see, so an authoritative answer might require some knowledge of internals. Would the maximum change on a 64-bit system?
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Why must wait() always be in synchronized block
...ronized block, otherwise an IllegalMonitorStateException is thrown. But what's the reason for making this restriction? I know that wait() releases the monitor, but why do we need to explicitly acquire the monitor by making particular block synchronized and then release the monitor by calling ...
JPA: what is the proper pattern for iterating over large result sets?
Let's say I have a table with millions of rows. Using JPA, what's the proper way to iterate over a query against that table, such that I don't have all an in-memory List with millions of objects?
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What happens if you static_cast invalid value to enum class?
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What is color set to according to the standard?
Answering with a quote from the C++11 and C++14 Standards:
[expr.static.cast]/10
A value of integral or enumeration type can be explicitly converted to an enumeration typ...
What is the best way to unit test Objective-C code?
What frameworks exist to unit test Objective-C code? I would like a framework that integrates nicely with Apple Xcode.
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