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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...
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...
deciding among subprocess, multiprocessing, and thread in Python?
...o threading while allowing CPython to scale your processing among multiple CPUs/cores despite the GIL (Global Interpreter Lock). It leverages all the fine-grained SMP locking and coherency effort that was done by developers of your OS kernel.
The threading option:
threading is for a fairly narrow r...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
...
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...
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...
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...
What is the meaning and difference between subject, user and principal?
...r's intent to a reader. When programming we have the luxury/curse that the CPU will interpret our instructions in only one way and we are forced to use it's level of precision. But in human language we need nuance and precision to convey meaning efficiently.
– T.Rob
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Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot? [close
...Pivot demo "Kitchen sink", after opening some groups it keeps eating whole CPU. If it's because of Pivot design, then I definitely don't want it in my projects.
– Display Name
Jun 20 '13 at 21:11
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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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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...