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Best practices for circular shift (rotate) operations in C++
...shld edi,edi,7 which is slower and takes more bytes than rol edi,7 on some CPUs (especially AMD, but also some Intel), when BMI2 isn't available for rorx eax,edi,25 to save a MOV.
MSVC: x86-64 CL19: Only recognized for constant-count rotates. (The wikipedia idiom is recognized, but the branch and A...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
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While running under node.js 0.10 (built on v8) I was seeing CPU usage that seemed excessive for the workload. I traced one performance problem to a function that was checking for the existence of a string in an array. So I ran some tests.
loaded 90,822 hosts
loading config took 0.08...
What's the use of Jade or Handlebars when writing AngularJs apps
...l. Mentally parsing a JADE template vs. raw HTML requires equal 'wetware' cpu time for me. I won't go so far as to say you're unprofessional if you disagree, but to me it's the same thing. @ Philipp, your analogy of parsing C/C++ to assembly being equal to parsing JADE to HTML is poor, there are ...
Quickly find whether a value is present in a C array?
... this doesn't take into account memory delays.
Theory of operation: ARM's CPU design executes most instructions in one clock cycle, but the instructions are executed in a pipeline. C compilers will try to eliminate the pipeline delays by interleaving other instructions in between. When presented wi...
Dokan虚拟磁盘开发实战 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...在DeleteDirectory里实现删除目录的同步），而删除文件则没问题。
这里有一点需要注意：因为执行Cleanup之前，可能会多次调用CreateFile，比如记事本保存文档时就会执行两次CreateFile之后再调用Cleanup，所以我在Cleanup的最后执行MySet...
Comparison of Android networking libraries: OkHTTP, Retrofit, and Volley [closed]
...ess your data using ByteString and Buffer to do some clever things to save CPU and memory. (FYI: This reminds me of the Koush's OIN library with NIO support!)
We can use Retrofit together with RxJava to combine and chain REST calls using rxObservables to avoid ugly callback chains (to avoid callback...
Why is lazy evaluation useful?
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Lazy evaluation related to CPU the same way as garbage collection related to RAM. GC allows you to pretend that you have unlimited amount of memory and thus request as many objects in memory as you need. Runtime will automatically reclaim unusable obje...
How to measure time in milliseconds using ANSI C?
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Doesn't this measure cpu time and not wall time?
– krs013
Feb 1 '15 at 4:53
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How to pass objects to functions in C++?
...fying its value while the function is being executed.
The downside is the CPU cycles and extra memory spent to copy the object.
Pass by const reference:
void func (const vector& v);
This form emulates pass-by-value behavior while removing the copying overhead. The function gets read access ...
How the single threaded non blocking IO model works in Node.js
...iting for network or disk (database / sockets) and the logic is not really CPU intensive - that is to say: this works well for IO-bound workloads.
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