travisdowns

// Output created by jacc on Sun Apr 07 22:44:19 COT 2019

package travisdowns.github.io;

class RegexParser extends ParserBase implements RegexTokens {
    private int yyss = 100;
    private int yytok;
    private int yysp = 0;
    private int[] yyst;
    protected int yyerrno = (-1);

travisdowns

An example of an allowed outcome not explained solely by StoreLoad reordering (i.e., could not occur on
a system with a total store order and only StoreLoad reordering).

all memory initially zero

thread 1:
mov [x],   1
mov   a, [x]
mov   b, [y]

travisdowns

package com.example.scrap;

import java.util.ArrayList;
import java.util.stream.Collectors;

import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;
import com.google.common.collect.PeekingIterator;

public class DecodeSim {

travisdowns

Results of HSW vs SKL decode tests, for different patterns of multi-byte nops.

Tests run with:

./uarch-bench.sh --timer=libpfc --test-name=misc/decode* --extra-events=inst_retired,lsd.uops,idq.dsb_uops,idq.mite_uops --precision=3

Haswell (i7-4770) Results:

** Running group misc : Miscellaneous tests **
                               Benchmark     Cycles     INST_R     LSD:UO     IDQ:DS     IDQ:MI

travisdowns

==========================================================================
== Memory bandwidth tests                                               ==
==                                                                      ==
== Note 1: 1MB = 1000000 bytes                                          ==
== Note 2: Results for 'copy' tests show how many bytes can be          ==
==         copied per second (adding together read and writen           ==
==         bytes would have provided twice higher numbers)              ==
== Note 3: 2-pass copy means that we are using a small temporary buffer ==
==         to first fetch data into it, and only then write it to the   ==
==         destination (source -> L1 cache, L1 cache -> destination)    ==

travisdowns

#!/bin/bash

LINUX=linux-4.19.5

set -e
set -x

if [ -z "$THREADS" ]; then
  echo "set THREADS to the number of compilation threads"
  exit 1

travisdowns

#!/bin/bash

sudo apt update
sudo apt-get install -y build-essential unzip

git clone https://github.com/inikep/lzbench
cd lzbench


curl http://sun.aei.polsl.pl/~sdeor/corpus/silesia.zip > silesia.zip

travisdowns

git clone https://github.com/Keith-S-Thompson/dhrystone
cd dhrystone/v2.2
CFLAGS=-O3 sh dry.c
./dry2

travisdowns

// file Base.java
public class Base {
	final void print() { System.out.println("base"); };
}

// file Derived.java
public class Derived extends Base {
	@Override
	void print() {
		System.out.println("derived");

travisdowns

/* https://stackoverflow.com/questions/20697215/when-should-we-use-prefetch */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/timeb.h>
#include <emmintrin.h>

#define MIB  (1024 * 1024)
#define ELEM int