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Service vs IntentService in the Android platform
...ou specify otherwise). This means that, if your service is going to do any CPU intensive work or blocking operations (such as MP3 playback or networking), you should create a new thread within the service to do that work.
– José Juan Sánchez
Nov 15 '14 at 15:...
How does LMAX's disruptor pattern work?
...nd because readers read entries sequentially, this is important to utilize CPU caches.
And lots of efforts to avoid lock, CAS, even memory barrier (e.g. use a non-volatile sequence variable if there's only one writer)
For developers of readers: Different annotating readers should write to differen...
How do you convert a byte array to a hexadecimal string, and vice versa?
...tation. Its safe variant is about 30% faster than the current leader on my CPU. The unsafe variants are even faster. stackoverflow.com/a/24343727/445517
– CodesInChaos
Jun 21 '14 at 17:12
...
现实版《道士下山》：道长老梁的四面人生 - 轻松一刻 - 清泛网 - 专注C/C++...
...前已经4皇冠；在“知乎”上，他解答了120个道教的相关问题，获得了7000个赞同；他还是道教题材的玄幻小说《返真》的作者，起点中文网A级签约作家……
在现实生活中，在金仙观里，却丝毫看不出他的“另类”，只是普通的...
How to create GUID / UUID?
...: 292ms 2961ms
- Note: 500k iterations, results will vary by browser/cpu.
So by my 6th iteration of optimizations, I beat the most popular answer by over 12X, the accepted answer by over 9X, and the fast-non-compliant answer by 2-3X. And I'm still rfc4122 compliant.
Interested in how? I'v...
how to listen to N channels? (dynamic select statement)
.... While waiting for an input channel to have a value this consumes all the CPU available. The whole point of select on multiple channels (without a default clause) is that it efficiently waits until at least one is ready without spinning.
– Dave C
Jun 29 '18 at...
What are the main performance differences between varchar and nvarchar SQL Server data types?
... highlighting how bad nvarchar performance can be...
SQL Server uses high CPU when searching inside nvarchar strings
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What does the git index contain EXACTLY?
...ex Entry Offset Table (IEOT) extension
This patch enables addressing the CPU cost of loading the index by adding
additional data to the index that will allow us to efficiently multi-
thread the loading and conversion of cache entries.
It accomplishes this by adding an (optional) index extension th...
What's the difference between the atomic and nonatomic attributes?
...s the default behavior
will ensure the present process is completed by the CPU, before another process accesses the variable
is not fast, as it ensures the process is completed entirely
Non-Atomic
is NOT the default behavior
faster (for synthesized code, that is, for variables created using @prope...
Caveats of select/poll vs. epoll reactors in Twisted
...are active at any given time.
All this means that epoll will lead to less CPU usage for most workloads. As far as memory usage goes, it's a bit of a toss up. select does manage to represent all the necessary information in a highly compact way (one bit per file descriptor). And the FD_SETSIZE (t...