Category: software programming

modules concept ( can put some limit/restrict on the template type ) template <template-parameter-list> concept concept-name = constraint-expression; https://ggulgulia.medium.com/c-20-concepts-part-1-the-basics-40f051c72776 #include <iostream> #include <vector>//first define a concept for print //lets call it…

  Fibonacci Print the Fibonacci series, useful for teaching basics of looping. Number Guessing Game The user thinks of a number between 1 and 100. The computer tries to guess…

increase audio volume ffmpeg -i ./containerd_runtime.mp4 -af volume=3 -vcodec copy new_containerd.mp4 Kazam screencast/recording   text to img: https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/stable_diffusion.ipynb#scrollTo=xSKWBKFPArKS

google SRE book notes: https://sre.google/sre-book/table-of-contents/ Risk measure aggregate availabilty = successful requests/total requests ( instead of uptime/downtime) release: Branching All code is checked into the main branch of the source…

How to Publish a kafka msg Kafka from programmer point of view is: just topic, key, value , headers https://kafka-python.readthedocs.io/en/master/apidoc/KafkaProducer.html send(topic, value=None, key=None, headers=None, partition=None, timestamp_ms=None)[source] Publish a message to a topic. Parameters: topic (str) –…

A poor man C/C++ linter and code coverage (gtests) C/C++ Linter: Cppcheck apt-get install cppcheck cppcheck –enable=all /your_cpp_source_dir   Test Code coverage : gcov/lcov g++ -o main –fprofile-arcs -ftest-coverage main_test.cpp…

Use cases both provide strong consistance for key/value store. zookeeper use ZAB, etcd use raft, usually one leader. normally use as configure store Zookeeper more like file system https://zookeeper.apache.org/doc/r3.3.6/zookeeperStarted.html bin/zkCli.sh…

Raft: paxos hard to understand, new consensus algorithm consensus algorithm:  Leader elections, log replicate https://github.com/etcd-io/etcd/blob/main/raft/README.md   This Raft library is stable and feature complete. As of 2016, it is the most…

GRPC   client side msg: header, msg, EOS server side msg:  header, msg, msg,  Trailer over http2 keep live? c++ async or sync? https://grpc.io/docs/languages/cpp/async/ , does it provider more performance than…

container name implementation/underlying struct notes/ sample unordered_set  The value of an element is at the same time its key, that identifies it uniquely. hash table unordered_multiset much like unordered_set containers, but allowing different…