Weizhen Wang hawkingrei

TiDB out-of-range repro assets

1) Prepare

mysql --comments --host 127.0.0.1 --port 4000 -u root -e "select tidb_version()\G"

2) Reproduce

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
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😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
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High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).

Intro

Matrix multiplication is a mathematical operation that defines the product of

	import gzip

	def gzip_search(query: str, candidate_chunks: list[str], top_k: int=1):
	"""
	文字列ベースで類似したテキストチャンクを推定するアルゴリズム.
	`query`, `chunk`, および`query + " " + chunk`をそれぞれgzipで圧縮し、編集距離のようなものをベースに評価する.

	Parameters:
	query (str): 検索クエリとして使用する文字列.
	top_k (int, optional): 返される類似チャンクの上位k個を指定する (default: 1).

	-Xms128m
	-Xmx8182m
	-XX:ReservedCodeCacheSize=512m
	-XX:CICompilerCount=2
	-XX:+HeapDumpOnOutOfMemoryError
	-XX:-OmitStackTraceInFastThrow
	-XX:+UnlockExperimentalVMOptions -XX:+UseZGC
	-XX:ZCollectionInterval=120 -XX:ZAllocationSpikeTolerance=5
	-XX:+UnlockDiagnosticVMOptions -XX:-ZProactive
	-ea

	//! AST vs RPN evaluation performance in Rust language.

	#![feature(test)]

	extern crate test;

	#[derive(Clone, Copy, Debug)]
	pub enum Function {
	Plus,
	Minus,

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	#include "webp/encode.h"
	#include "./metadata.h"

	int WebPMemoryWrite(const uint8_t *data, size_t data_size,
	WebPMemoryWriter *const w)
	{

	# Installing ScyllaDB in AWS with DPDK enabled
	# Prerequisites:
	# - Red Hat Enterprise Linux 7.2 (HVM)
	# - Instance type that supports enhanced networking (see http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html#enhanced_networking_instance_types)
	# - Secondary NIC installed via Network Interfaces in AWS
	# - Instance type with 2 hard drives for RAID0 array

	########## DO THIS FIRST ################
	# Fetch the latest linux kernel
	yum update -y

	#include <stdio.h>
	#include <unistd.h>

	int main(int argc, char **argv)
	{
	printf("--beginning of program\n");

	int counter = 0;
	pid_t pid = fork();

	package main

	import (
	"reflect"
	"strings"
	)

	func makeChannel(t reflect.Type, chanDir reflect.ChanDir, buffer int) reflect.Value {
	ctype := reflect.ChanOf(chanDir, t)
	return reflect.MakeChan(ctype, buffer)