思路/方法 设计了Migratory Compression. 调整chunk相对位置,将相似chunk排列在一起,通过压缩来减少data store占用的实际存储空间. https://en.wikipedia.org/wiki/Delta_encoding 工作量 mzip: 单文件上进行Migratory Compression - 三种途径调整chunk顺序(In-Memory.Chunk-level.Multi-pass) Intra-file Delta Compression: 单…
Data Compression is an approach to compress the origin dataset and save spaces. According to the Economist reports, the amount of digital dat in the world is growing explosively, which increase from 1.2 zettabytes to 1.8 zettabytes in 2010 and 2011.…
http://blog.packagecloud.io/eng/2016/06/22/monitoring-tuning-linux-networking-stack-receiving-data/ Jun 22, 2016 • packagecloud Tags: packagecloud linux kernel networking optimization tuning monitoring TL;DR This blog post explains how computers runn…
MongoDB3.0中的压缩选项 在MongoDB 3.0中,WiredTiger为集合提供三个压缩选项: 无压缩 Snappy(默认启用) – 很不错的压缩,有效利用资源 zlib(类似gzip) – 出色的压缩,但需要占用更多资源 有索引的两个压缩选项: 无压缩 前缀(默认启用) – 良好的压缩,资源的有效利用 请记住哪些适用于MongoDB的3.0所有压缩选项: 随机数据不能压缩 二进制数据不能压缩(它可能已经被压缩) 文本压缩效果特别好 对于文件中的字段名压缩效果特别好(尤其对短字段名来…
MyISAM storage engine has key compression which makes its indexes much smaller, allowing better fit in caches and so improving performance dramatically. Actually packed indexes not a bit longer rows is frequent reason of MyISAM performing better than…
14.7 InnoDB Table Compression 14.7.1 Overview of Table Compression 14.7.2 Enabling Compression for a Table 14.7.3 Tuning Compression for InnoDB Tables 14.7.4 Monitoring Compression at Runtime 14.7.5 How Compression Works for InnoDB Tables 14.7.6 Comp…
Symptom You have questions related to the SAP HANA memory. You experience a high memory utilization or out of memory dumps. Environment SAP HANA Cause 1. Which indications exist for SAP HANA memory problems?2. How can I collect information about the…
note: if you'll load data,the data shape should be similar with saved data's shape.    -- 中式英语,天下无敌 import tensorflow as tf import numpy as np # save variable data W = tf.Variable([[2, 3], [3, 4]], dtype=tf.float32) b = tf.Variable([[3, 4]], dtype=tf…
Data Bundles A data bundle is a collection of pricing data, adjustment data, and an asset database. Bundles allow us to preload all of the data we will need to run backtests and store the data for future runs. 数据包是定价数据,调整数据和资产数据库的集合. Bundles允许我们预先加载所…
Overview 从宏观的角度来看,一个packet从网卡到socket接收缓冲区的路径如下所示: 驱动加载并初始化 packet到达网卡 packet通过DMA被拷贝到内核中的一个ring buffer 产生一个硬件中断,让系统知道已经有个packet到达内存 驱动会调用NAPI启动一个poll loop,如果它还没启动的话 系统的每个CPU上都有一个ksoftirqd进程,它们都是在系统启动的时候就已经注册了的.ksoftirqd进程会调用NAPI的poll函数从ring buffer中将p…