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PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
PHP操作MongoDB时的整数问题及对策本文所说的整数问题，其实并不是MongoDB的问题，而是PHP驱动的问题：MongoDB本身有两种整数类型，分别是：32位整数和64位整数，但旧版的PHP...本文所说的整数问题，其实并不是MongoDB的问题，而是P...
What does Python's eval() do?
... I have 8 cores so I would want a list [1, 8].
>>>from os import cpu_count
>>>eval('[1, cpu_count()]')
[1, 8]
Likewise all of __builtins__ is available.
>>>eval('abs(-1)')
1
Ok. So there we see one function we want exposed and an example of one (of many that can be m...
linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成DROP的话)
允许loopback!(不然会导致DNS无法正常关闭等问题)
IPTABLES -A INPUT -i lo -p all -j ACCEPT (如果是INPUT DROP)
IPTABLES -A OUTPUT -o lo -p all -j ACCEPT(如果是OUTPUT DROP)
下面写OUTPUT链,OUTPUT链默认规则是ACCEPT,所以我们就写需要DROP(放弃)...
Difference between global and device functions
...
__global__ - Runs on the GPU, called from the CPU or the GPU*. Executed with <<<dim3>>> arguments.
__device__ - Runs on the GPU, called from the GPU. Can be used with variabiles too.
__host__ - Runs on the CPU, called from the CPU.
*) __global__ funct...
OS X10.9 环境下部署 QT5.3.1 常见的编译问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
OS X10.9 环境下部署 QT5.3.1 常见的编译问题出于本身对UNIX系统的好奇，以及身边一群对 Swift 语言各种推崇的苹果教徒的影响，这几天折腾起 MAC OS X来，体验下这个被无数开发者...
出于本身对UNIX系统的好奇，以及身边一群对 Swift ...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
...or
adb shell dumpsys | grep myapp | grep Error
or anything that helps...etc
if app is not running you will get nothing as result.
When app is stoped messsage is shown on screen by android, process is still active and if you check via "ps" command or anything else, you will see process state is n...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...nch prediction does work. Taken branches are problematic for instruction-fetch and decode even when they're predicted perfectly. Some CPUs statically predict branches that aren't in their history table, usually with assume not-taken for forward branches. Intel CPUs don't work that way: they don't...
How does one write code that best utilizes the CPU cache to improve performance?
...
The cache is there to reduce the number of times the CPU would stall waiting for a memory request to be fulfilled (avoiding the memory latency), and as a second effect, possibly to reduce the overall amount of data that needs to be transfered (preserving memory bandwidth).
Tec...
What is the purpose of XORing a register with itself? [duplicate]
...y, in the big picture it's faster. There are fewer bytes that have to be fetched from RAM.
– Loren Pechtel
Dec 7 '09 at 0:21
12
...
How to determine why visual studio might be skipping projects when building a solution
... configured for "Mixed Platforms" while the solution was set to build "Any CPU".
*When this problem happened to me, The main project only had 'Any CPU' and it set the child dll to 'any CPU' too, however, I'd deleted that profile and left only 'x86'. Picking x86 for just the dll make it start worki...