Division 1: A Baseline NAS

Division 2: A “Rig” for Computing & Rendering

Stage 1

Notes:

• Some may suggest MSI B450M MORTAR TITANIUM / MAX, which turn out to be almost the same except in another color / capable of higher RAM frequency.
• The stylish inverted BitFenix Prodigy M case has some unique air flow issues.

Stage 2

Notes:

• Entry-level AIO water coolers are not recommended, which can’t even beat tower fan coolers.

Video Editing PC Building

Deep Learning Rig Building

• Prerequisite of chacha20: libsodium

The service moved to V2ray.

Basics: Purgeable space is not unused space.

Purgeable space is logically unoccupied at the scope of macOS System, but physically not.

Idiot apps like Xcode would refuse to install, though the “available” space is fairly enough, given that purgeable space included.

Use df -h to query for unused disk space physically.

Purgeable space can be released manually by making local snapshots thinner.

tmutil thinlocalsnapshots / 10000000000 4

Shrink TimeMachine backups.

Remove local Photo Library

Stop icloud photo syncing.

Remove unused Simulators

They can be downloaded again from Xcode when in need.

xcrun simctl delete unavailable/all

Remove unused Docker local image

• What are the method(s) that iterator object must implement?

  __iter__() and __next__()

• If a function contains at least one yield statement, it becomes a generator function.

• In Python, there is a built-in function property() that returns a property object. The property object has which of the following methods?

  getter(), setter() and delete()

• zip produces an iterator which can only be iterated once. Once you have iterated it, it’s exhausted.

• Where to use closure

  • We must have a nested function (function inside a function).
  • The nested function must refer to a value defined in the enclosing function.
  • The enclosing function must return the nested function.

Source and Header

The reasons to separate are:

• To improve build times. Faster recompiles: If your implementation is split up into separate compilation units, you only need to recompile the ones that change when making edits.
• To link against code without having the source for the definitions.
• To avoid marking everything “inline”.

Polymorphism in C++

Compile time polymorphism

Function/Operator Overloading

Runtime polymorphism

Function overriding on the other hand occurs when a derived class has a definition for one of the member functions of the base class.

• To avoid ambiguity error when multiple inheritence.

• Virtual functions are functions that can be overridden in derived class with the same signature.

• Virtual functions enable run-time polymorphism in a inheritance hierarchy.

• If a function is ‘virtual’ in the base class, the most-derived class’s implementation of the function is called according to the actual type of the object referred to, regardless of the declared type of the pointer or reference. In non-virtual functions, the functions are called according to the type of reference or pointer.

• Static functions are class specific and may not be called on objects. Virtual functions are called according to the pointed or referred object.

• Virtual function has a VPTR that poccesses some memory.

• A member function can be virtual even if we have not uses virtual keyword with it. When a class has a virtual function, functions with same signature in all descendant classes automatically become virtual. We don’t need to use virtual keyword in declaration of fun() in B and C. They are anyways virtual.

• A base class function can be accessed with scope resolution operator even if the function is virtual.

Some legacy codes are not compatible with latest nodejs. nvm helps with this situation to provide older stable version.

Uninstall system-wide nodejs and install nvm via package management.

Config fish-shell:

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function nvm
   bass source (brew --prefix nvm)/nvm.sh --no-use ';' nvm $argv
end

set -x NVM_DIR ~/.nvm
nvm use default --silent

Take effect immediately:

source ~/.config/fish/config.fish

An extension to fish-shell is bass.

Bass makes it easy to use utilities written for Bash in fish shell.

An extension to homebrew is cask.

https://databricks.com/blog/2015/06/22/understanding-your-spark-application-through-visualization.html

https://spark.apache.org/docs/latest/cluster-overview.html

https://mapr.com/blog/getting-started-spark-web-ui/

https://michalsenkyr.github.io/2018/01/spark-performance

https://dzone.com/articles/my-tryst-with-elasticsearch

https://juejin.im/entry/5893e8f2128fe10065477d08

https://www.cnblogs.com/wenbochang/p/8808072.html

https://blog.csdn.net/mxsgoden/article/details/8821936

https://www.nowcoder.com/discuss/77835?type=2&order=1&pos=913&page=1

https://blog.csdn.net/weixin_33759269/article/details/93054344

https://blog.csdn.net/qq_35264464/article/details/80050005

https://www.nowcoder.com/discuss/169881

http://blog.sina.com.cn/s/blog_6d932f2a0101jjkl.html

https://www.nowcoder.com/discuss/273271

https://www.nowcoder.com/discuss/161537

https://www.nowcoder.com/discuss/172152?type=0&order=0&pos=5&page=4

• Why IA Matters for UX — A Brief History of Information Architecture

  Information architecture (IA) is essentially a mental wayfinding system.