foreverbell foreverbell

A Quick and Dirty Lens primer

Why does Lens exist? Well, Haskell records suck, for a number of reasons. I will enumerate them using this sample record.

data User = User { login    :: Text
                 , password :: ByteString
                 , email    :: Text
                 , created  :: UTCTime
 }

What is NUMA (Non-Uniformed Memory Access)

Non-Uniform Memory Access (NUMA) is one of the computer memory design methods used in multiprocessor systems, and the time to access the memory varies depending on the relative position between the memory and the processor. In the NUMA architecture, when a processor accesses its local memory, it is faster than when it accesses the remote memory. Remote memory refers to memory that is connected to another processor, and local memory refers to memory that is connected to its own processor. In other words, it is a technology to increase memory access efficiency while using multiple processors on one motherboard. When a specific processor runs out of memory, it monopolizes the bus by itself, so other processors have to play. , and designate 'access only here', and call it a NUMA node.

1. Check Nodes

lspci | grep -i nvidia
  
01:00.0 VGA compatible controller: NVIDIA Corporation TU106 [GeForce RTX 2060 12GB] (rev a1)

-To remove a submodule you need to:
-Delete the relevant line from the .gitmodules file.
-Delete the relevant section from .git/config.
-Run git rm --cached path_to_submodule (no trailing slash).
-Commit and delete the now untracked submodule files.

	#!/usr/bin/env python
	"""
	Very simple HTTP server in python (Updated for Python 3.7)

	Usage:

	./dummy-web-server.py -h
	./dummy-web-server.py -l localhost -p 8000

	Send a GET request:

	" install vundle first:
	" git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim

	set hidden
	set nocompatible " do not compatible with vi
	set backspace=indent,eol,start " allow backspace to delete char
	set modeline
	set shiftwidth=4 " set tab width to 4 space
	set tabstop=4
	set expandtab

	#include <stdio.h> /* printf() */
	#include <stdlib.h> /* exit(), malloc(), free() */
	#include <unistd.h>
	#include <sys/types.h> /* key_t, sem_t, pid_t */
	#include <sys/wait.h>
	#include <sys/shm.h> /* shmat(), IPC_RMID */
	#include <errno.h> /* errno, ECHILD */
	#include <semaphore.h> /* sem_open(), sem_destroy(), sem_wait().. */
	#include <fcntl.h> /* O_CREAT, O_EXEC */

	FROM nvidia/cuda:9.0-cudnn7-devel-ubuntu16.04

	#-------------------------------------------------------------------------------
	### Enable UTF8 in docker instance
	#-------------------------------------------------------------------------------
	RUN apt-get update -y && \
	apt-get install -y locales && \
	rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*
	RUN locale-gen en_US.UTF-8
	ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'