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How do I debug Node.js applications?
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I don't find the cpu reports from nodetime very helpful: 1. I just get a tree of methods, with no 'self' time. 2. Seems like the tree branches are trimmed below a certain number of precentage. Those 2 makes it very difficult to undestan...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
微博为什么限制140字(附短信70字限制考)问题的提出申请过那么多的微博，数申请网易微博的动机最不纯，因为它的字数限制不是传说中的140字，而是163个字。当年觉得很可爱，于是就注...问题的提出
申请过那么多的微博，数申...
Why is x86 ugly? Why is it considered inferior when compared to others? [closed]
...instructions. In the modern era this cost is becoming vanishingly small as CPUs become more and more limited by memory bandwidth than by raw computation, but many "x86 bashing" articles and attitudes come from an era when this cost was comparatively much larger.
Update 2016: Anandtech has posted a d...
Floating point vs integer calculations on modern hardware
...all of the data can reside in cache, where they can be quickly sent to the CPU. A very, very slow floating point operation that already has the data in cache will be many times faster than an integer operation where an integer needs to be copied from system memory.
I assume that you are asking thi...
Running multiple AsyncTasks at the same time — not possible?
...4 (API 19) the above fields are changed to this:
private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
private static final int CORE_POOL_SIZE = CPU_COUNT + 1;
private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;
private static final BlockingQueue<Runnable&g...
Why do stacks typically grow downwards?
...n (because I didn't design them). My thoughts on the matter are that early CPUs got their original program counter set to 0 and it was a natural desire to start the stack at the other end and grow downwards, since their code naturally grows upward.
As an aside, note that this setting of the prog...
How do I read CSV data into a record array in NumPy?
...sing NumPy and Pandas, using pandas has a lot of advantages:
Faster
Less CPU usage
1/3 RAM usage compared to NumPy genfromtxt
This is my test code:
$ for f in test_pandas.py test_numpy_csv.py ; do /usr/bin/time python $f; done
2.94user 0.41system 0:03.05elapsed 109%CPU (0avgtext+0avgdata 50206...
Are Java static calls more or less expensive than non-static calls?
...n variable, and looping if not true.
I suppose the results will vary from CPU to CPU, and from JVM to JVM, so give it a try and see what you get:
import java.io.*;
class StaticVsInstanceBenchmark
{
public static void main( String[] args ) throws Exception
{
StaticVsInstanceBenchma...
How to debug a GLSL shader?
...
You can't easily communicate back to the CPU from within GLSL. Using glslDevil or other tools is your best bet.
A printf would require trying to get back to the CPU from the GPU running the GLSL code. Instead, you can try pushing ahead to the display. Instead ...
Nodejs Event Loop
...'s perspective:
Script engine starts execution of the script.
Any time a CPU bound operation is encountered, it is executed inline (real machine), in its completeness.
Any time an I/O bound operation is encountered, the request, and its completion handler are registered with an 'event machinery' (...