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怎么解决MQTT连接掉线，自动连接问题，同时解决，反复断开连接，断开连接问...
解决MQTT退出后台后掉线自动连接问题，现在可以实现自动连接，但是在返回控制界面的时候，反复断开反复链接，还有切换页面的时候返回也是同样的问题，还有连接一个服务器，需要每个页面单独设置MQTT连接吗，是不是可以...
What is a “thread” (really)?
...
@Richard: The exact list of CPU registers depends on the architecture, but instruction pointer and stack pointer are pretty much universal. They define a thread insofar as when this thread (set of register values) is loaded in the processor core, the t...
What kind of Garbage Collection does Go use?
...-world/concurrent collector
stop-the-world part limited by a 10ms deadline
CPU cores dedicated to running the concurrent collector
tri-color mark-and-sweep algorithm
non-generational
non-compacting
fully precise
incurs a small cost if the program is moving pointers around
lower latency, but most lik...
TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...些事儿（上）TCP是一个巨复杂的协议，因为他要解决很多问题，而这些问题又带出了很多子问题和阴暗面。所以学习TCP本身是个比较痛苦的过程，但对于学习的...
TCP是一个巨复杂的协议，因为他要解决很多问题，而这些问题又...
Programmatically get the cache line size?
...nt kernel), you can get this information out of /sys:
/sys/devices/system/cpu/cpu0/cache/
This directory has a subdirectory for each level of cache. Each of those directories contains the following files:
coherency_line_size
level
number_of_sets
physical_line_partition
shared_cpu_list
shared_cp...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
Is calculating an MD5 hash less CPU intensive than SHA-1 or SHA-2 on "standard" laptop x86 hardware? I'm interested in general information, not specific to a certain chip.
...
C++ obtaining milliseconds time on Linux — clock() doesn't seem to work properly
...ld more (your program could run multiple threads and so could consume more CPU than real time) or less. It measures an approximation of CPU time used. To see the difference consider this code
#include <iostream>
#include <ctime>
#include <unistd.h>
int main() {
std::clock_t a...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示，今年或将迎来真正的家政O2O大战，那么问题来了，怎么战？融资后的钱是否仅有补贴一道？
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注，根据“云家政”去年年底发布的北上广深四地家...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示，今年或将迎来真正的家政O2O大战，那么问题来了，怎么战？融资后的钱是否仅有补贴一道？
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注，根据“云家政”去年年底发布的北上广深四地家...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示，今年或将迎来真正的家政O2O大战，那么问题来了，怎么战？融资后的钱是否仅有补贴一道？
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注，根据“云家政”去年年底发布的北上广深四地家...