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RSS订阅原创 malloc in signal handler causes deadloc
【代码】malloc in signal handler causes deadloc。
2024-02-12 11:41:27
374
转载 Google On Latency Tolerant Systems: Making A Predictable Whole Out Of Unpredictable Parts
In Taming The Long Latency Tail we covered Luiz Barroso’s exploration of the long tail latency (some operations are really slow) problems generated by large fanout architectures (a request is composed of potentially thousands of other requests). You may ha
2022-06-12 20:46:28
333
原创 框架与引擎
A: What’s the difference between an “engine” and a “framework”Q: These terms, and others, do seem very similar. They’re named from a conceptual standpoint, and so could be defined as follows:A “framework” is a “foundation” or “support structure” aroun
2022-04-18 11:44:21
676
原创 测试速度与可靠性
摘 Azure DevOps Shift left to make testing fast and reliable用例分类Defining a test taxonomy is an important aspect to DevOps. Developers should understand the right types of tests to use in different scenarios, as well as what tests are required at differ.
2022-03-09 13:38:47
441
原创 linux bash 常用操作
找到失效的符号链接并删除find . -xtype l -exec rm {} \;find -xtype l：We’ll use the l flag with xtype, to tell it to search for links, return broken links:参考文章
2022-01-14 15:42:58
280
转载 marshmallow vs. pydantic – Python’s 2 best libraries for data serialization and validation
from : https://www.augmentedmind.de/2020/10/25/marshmallow-vs-pydantic-python/Data (de-) serialization is about converting between raw data items and instances of your Python classes, in order to transmit or store data. A typical example is the conversion
2021-11-16 16:00:55
1025
原创 Pydantic&FastAPI
Pydanticwhat is:Define how data should be in pure, canonical python; validate it with pydantic官网: https://pydantic-docs.helpmanual.io/Sample:from datetime import datetimefrom typing import List, Optionalfrom pydantic import BaseModelclass User
2021-10-07 20:10:00
276
原创 覆盖率coverage
cpp 覆盖率optionscompile: -fprofile-arcs, -ftest-coveragelink: -lgcov或者：compile: --coveragelink: --coverage详情参见:https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Instrumentation-Options.html编译完后会产生*.gcno, *.gcda 文件lcov用lcov 收集数据## *.gc?? 数据在gcda_
2021-10-07 11:19:40
248
原创 linux 证书有效期查看
查看本地证书有效日期openssl x509 -in ${cer-path} -noout -datesopenssl 参数x509 : Run certificate display and signing utility.-noout : Prevents output of the encoded version of the certificate.-dates : Prints out the start and expiry dates of a TLS or SSL cert
2021-10-05 17:05:01
6270
原创 第三方库管理
问题项目的3rd 问题源码直接放git 仓库， 越来越大，开发效率低下，CICD耗时长占用空间，其实很多时候，一个人一台开发机上只需要一个3rd 库， 而不是每个project path一个3rd库编译后的产出物放git仓库，缺乏对3rd的版本和构建管理工具c++ 里的第三方库管理工具： https://docs.conan.io/en/latest/introduction.html...
2021-09-13 16:16:44
169
原创 dict 和 object的转换
dict objectSEQS = tuple, list, set, frozenset class Jsonize(object): def __init__(self): super(Jsonize, self).__init__() def FromDict(d): this = Jsonize() # this = type(Jsonize.__name__, (Jsonize,), d) for k, v in d.items(
2021-05-29 21:17:45
301
原创 conda
安装获取安装包wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh 或者使用清华的源wget https://mirrors.tuna.tsinghua.edu.cn/anaconda/miniconda/Miniconda3-latest-Linux-x86_64.sh 运行bash Miniconda3-latest-Linux-x86_64.sh 配置增加国内镜像源： conda
2021-05-17 15:42:51
113
转载 Dapr, the hard way
Dapr, the hard way#dapr#kubernetes#distributedsystemsJosé Miguel Parrella2020年2月13日・7 min readThis weekend I wanted to catch up withDapr, the Distributed Application Runtime. As a sysadmin by trade, I have little knowledge of application model th...
2021-05-15 17:33:42
231
原创 rpm 安装解压
下载rpm工具 yumdownloader安装：yum install yum-utils示例：yumdownloader --resolve --destdir /root/mypackages/ httpd查看、解压rpm里的文件查看rpm -qpl httpd.rpm 解压rpm2cpio httpd.rpm | cpio -div 指定安装目录使用prefixrpm -i –prefix=/home/admin httpd.rpm 注：不是所有的r
2021-05-06 09:57:39
880
转载 Multi-Runtime Microservices Architecture
Key TakeawaysCreating distributed systems is not an easy task. Best practices have emerged around “microservice” architecture and “12-factor app” design. These provide guidelines related to the delivery lifecycle, networking, state management, and bindin
2021-04-22 21:21:17
853
原创 时序数据库
时间序例：一个指标 + N 个标签KV组合（N >= 1），可以定义为一个时间序列。一个时间序列上产生的数据值的增加，不会导致时间序列的增加。指标 和 标签可以唯一确定一个时间序例。聚合： 对多个时间序例上的同一时间(窗口)的数值进行处理。downsample : 一个时间序例上的给定时间窗口内的数值进行处理。refTSDB写入与查询讲解,聚合(aggregator)与采样(downsample)讲解—以opentsdb为例...
2021-04-19 19:27:25
168
原创 rscocket
官网https://rsocket.io/exampleC++server: // RSocket server accepting on TCP auto rs = RSocket::createServer(TcpConnectionAcceptor::create(FLAGS_port)); // global request handler auto handler = std::make_shared<HelloStreamRequestHandler>
2021-03-19 14:38:18
137
原创 dapr
版本发布与简介：https://www.infoq.cn/article/m1hMST70ck2VB3GKNM39官网：https://docs.dapr.io/ github:https://github.com/dapr/dapr/releases/tag/v1.0.0
2021-02-22 15:19:49
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原创 一些机器学习相关的框架
元天introduce: https://tech.ifeng.com/c/7v70nteB48lcode: https://github.com/MegEngine/MegEngine一些值得注意的地方：一键切换训练推理在机器学习中，训练与推理一直不是一体的，当我们设计算法时，首先需要训练框架的支持，然后再把训练好的模型转移到推理框架上，从而将后续的推理计算放到各种硬件上。这中间会存在训练与推理的转换，这个过程需要手动完成，甚至转换后也不能保证模型性能与进度。「训练推理一体化能把繁
2021-02-01 11:42:51
240
原创 c++重载 operator -＞
重载 -> 运算符示例如下不能是静态函数返回 T的指针，再调用T-><type T>class Pointer{ Pointer(const T* t) : _target(t) T * operator ->() { return _target } T* _target;};This is the only really tricky one. It must be a nonstatic member function, an
2021-01-03 15:33:45
206
原创 c++ 调用java
[TODO]通过JNI 调用 java 的jar， 主要步骤获取 classjclass c = (*env)->FindClass(env,“com/camera/webcam/Test”);获取 methodjfieldID width_id = (*env)->GetFieldID(env, c, “width”, “I”);遍历hashmaprefhttps://blog.csdn.net/plx0303sunny/article/details/103457
2021-01-02 16:06:29
159
原创 TVM
TVM简介： https://blog.csdn.net/tlzhatao/article/details/93630910TVM: An Automated End-to-End Optimizing Compiler for Deep Learning
2020-12-14 13:40:51
146
原创 java 实现tips
读取resources放在与java 目录平级的resources 下的资源，可以通过以下方法获取String path = this.getClass().getClassLoader().getResource(name).getPath();BufferedReader in = new BufferedReader(new FileReader(path));String str;String content = "";while ((str = in.readLine()) != nu
2020-12-08 11:50:10
111
转载 jieba分词词性对照表
from:https://blog.csdn.net/princemrgao/article/details/107532469------jieba分词词性对照表标注 解释 标注 解释 标注 解释 a 形容词 mq 数量词 tg 时语素 ad 副形词 n 名词 u 助词 ag 形语素 ng 例：义 乳 亭 ud 例：得 an 名形词 nr ..
2020-11-23 14:19:27
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原创 spacy NLP
spacy官方文档：https://spacy.io中文模型：https://spacy.io/models/zhgit: https://github.com/explosion/spaCyrefhttps://blog.csdn.net/shebao3333/article/details/97407644
2020-11-20 10:13:27
109
原创 python 处理pdf
pdfminercode: https://github.com/pdfminer/pdfminer.sixdoc: https://pdfminersix.readthedocs.io
2020-11-17 15:30:55
101
原创 How To Package And Distribute Python Applications
IntroductionAll Python libraries (i.e. application packages) that you download using a package manager (e.g. pip) are distributed using a utility dedicated to do the job. These utilities create “Python distributions” which are basically versioned (and com
2020-10-03 16:54:10
267
原创 linux源码安装git
linux 源码安装git， 各种坑，记录一下获取源码wget https://github.com/git/git/archive/v2.3.0.zipunzip v2.3.0.zipcd git-2.3.0编译安装设置注意看 Makefile ，下边几个宏需要注意CURLDIR找不到libcurl的*.h和lib，重新安装了libcurl, 需要指定libcurl的*.h, lib的位置NO_R_TO_GCC_LINKER编译过程中出现 error: unrecogni
2020-09-01 14:05:56
150
原创 python 多线程多进程
Event多线程多进程 间同步可以使用 Event代码中是多线程， 使用 multiprocessing 的 Event，在处理系统信号的函数中 event.set() 卡死，换成 threading 的 Event 才对# from multiprocessing import Event from threading import Event glogger = logging.getLogger('')class ZService(object): stop_event =
2020-08-19 17:58:34
161
原创 portable binary
原文地址要翻墙，就复制到下面Creating portable Linux binariesPosted by insane coder at Thursday, July 19, 2012For some, the idea of creating a portable Linux binary is somewhat elusive.In this article, we will be discussing how to create a Linux binary for a speci
2020-08-07 15:44:53
178
原创 Resource acquisition is initialization 初始时获取资源
RAII概念Resource acquisition is initialization： (通过对象) 初始化时就获取资源(，销毁时释放资源)是一种代码编写思想， 通用对象的生命周期来对资源进行管理。好处典型场景refhttps://en.wikipedia.org/wiki/Resource_acquisition_is_initialization...
2020-07-09 11:28:04
197
原创 分布式锁
分布式锁资源互斥可用墙上时间有效租期session的有效时间，client 一定比server小， 由client 主动发起续租，避免机器之间时间漂移 而无法严格对对齐的问题切换时间client 与server 的HB 间隔比较长，带来的问题是 client 因故障没有主动释放锁，那其它的锁竞争者(client) 只能等到 session 超时才会重新抢锁。在一些应用场景下对服务可用性有不小的不利影响。反之，虽然锁切换时间变短，但对于server 会产生较大的压力，也可能因网络短
2020-06-18 14:24:45
202
原创 c++与python的数据交互
c++和python 都可以用pickle对数据进行序列化、反序列化，进而通过tcp/dup，pipe, shared memory 等方法进行通信PicklingTools: Cross Language Tools for Communication
2020-06-15 15:09:20
923
saunders-jeffery.pdf
2020-06-15
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