It's great for beginners. Then it turns into a mess.
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
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# Detect operating system in Makefile. | |
# Author: He Tao | |
# Date: 2015-05-30 | |
OSFLAG := | |
ifeq ($(OS),Windows_NT) | |
OSFLAG += -D WIN32 | |
ifeq ($(PROCESSOR_ARCHITECTURE),AMD64) | |
OSFLAG += -D AMD64 | |
endif |
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SHELL=/bin/bash | |
# to see all colors, run | |
# bash -c 'for c in {0..255}; do tput setaf $c; tput setaf $c | cat -v; echo =$c; done' | |
# the first 15 entries are the 8-bit colors | |
# define standard colors | |
ifneq (,$(findstring xterm,${TERM})) | |
BLACK := $(shell tput -Txterm setaf 0) | |
RED := $(shell tput -Txterm setaf 1) |
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#!/usr/bin/perl | |
# | |
# Pre-commit hook for running checkstyle on changed Java sources | |
# | |
# To use this you need: | |
# 1. checkstyle's jar file somewhere | |
# 2. a checkstyle XML check file somewhere | |
# 3. To configure git: | |
# * git config --add checkstyle.jar <location of jar> | |
# * git config --add checkstyle.checkfile <location of checkfile> |
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postgres: | |
image: postgres:9.4 | |
volumes: | |
- ./init.sql:/docker-entrypoint-initdb.d/init.sql |
Yes, there are several ways to do this, but none of them are as direct and simple as git v2.1.2; htop v1.2.3
and come with a lot of caveats.
aside
Specifying versions for programming language packages are possible too, but that topic seems to be even messier. The most promising standardization effort to date is [dream2nix
][1].
That is, available at the time of this writing:
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package com.operative.pipelinetracker.controller; | |
import java.util.HashMap; | |
import java.util.Map; | |
import java.util.Properties; | |
import org.apache.kafka.clients.consumer.KafkaConsumer; | |
import org.apache.kafka.clients.consumer.OffsetAndMetadata; | |
import org.apache.kafka.common.TopicPartition; | |
import org.apache.kafka.common.serialization.StringDeserializer; |
Below are the Big O performance of common functions of different Java Collections.
List | Add | Remove | Get | Contains | Next | Data Structure |
---|---|---|---|---|---|---|
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array |
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List |
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array |