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clang: how to list supported target architectures?
...the architectures listed, llc -march=ARCH -mattr=help will list "available CPUs" and "available features". The CPUs are generally just a convenient way of setting a default collection of features.
But now for the bad news. There is no convenient table of triples in Clang or LLVM that can be dumped...
Select random lines from a file
...0 --file lines_78000000000.txt > /dev/null 0.02s user 0.01s system 80% cpu 0.047 total
The reason it is so fast, well I don't read the whole file and just move the file pointer 10 times and print the line after the pointer.
Gitlab Repo
Old attempt
First I needed a file of 78.000.000.000 lines:...
When to use PNG or JPG in iPhone development?
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PNG's are pixel perfect (non-lossy), and require very little extra CPU energy to display. However, large PNGs may take longer to read from storage than more compressed image formats, and thus be slower to display.
JPG's are smaller to store, but lossy (amount depends on compression level),...
What is the purpose of a stack? Why do we need it?
...It has very good locality of reference, a very important feature on modern CPUs that chew through data a lot faster than RAM can supply it and supports recursion. Language design is heavily influenced by having a stack, visible in support for local variables and scope limited to the method body. A...
为什么你越努力，却越焦虑？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...谈谈。如果有所疏漏偏颇，期待大家指正！
看到这个问题，我顿时有一股扑面而来的辛酸，因为我曾经在人生最该拼搏的时候，沉溺在一段不努力也不焦虑的「舒适」中。回头看看这段经历，我想我能够立刻给这个问题一个...
携程遭超长宕机：内部数据管理恐存严重漏洞 - 资讯 - 清泛网 - 专注C/C++及内核技术
...目前官方透露的信息判断，携程网站数据层、网络层均没问题，那么问题就在应用层或存储逻辑层。很可能关键性的系统部署和配置数据已被删除或篡改了。
不过，前支付宝运维团队创始人智锦撰文指出，携程网宕机很可能并...
小端模式 和 大端模式的决定因素 - C/C++ - 清泛网 - 专注C/C++及内核技术
...和 大端模式的决定因素小端模式 和 大端模式：几乎是由CPU决定的，而非OS或编译器。大端模式和小端模式的区别这里暂不讨论，这里讨论他们是由操作系统、CPU还是编译器决定的呢？
通常来讲，可能大多数人认为是操作系统...
Why is address zero used for the null pointer?
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@GMan - You are correct. On early CPUs, memory address zero was special and had hardware protection against access from running software (in some cases it was the start of the reset vector, and modifying it could prevent the CPU from resetting or starting up)...
Using Java with Nvidia GPUs (CUDA)
...of the matrix. In this case, one can expect that the GPU will outperform a CPU at a certain matrix size. Another example could be when many complex trigonometric computations (sine/cosine etc) are performed on "few" data elements.
As a rule of thumb: You can assume that reading/writing one data el...
C# 能否获取一个对象所占内存的大小？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...所占内存的大小？今日，在项目重构的时候忽然想到一个问题，一个类哪些成员的增加，会影响一个类所占内存的大小？C#有没有办法知道一个对象占多少内存呢？ ...今日，在项目重构的时候忽然想到一个问题，一个类哪些成员...