Firebird Database Cache Buffer Norman Dunbar, Martin Köditz Version 1.2, 28 May 2020 Table of Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. The Firebird Cache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table of Contents 1 Chapter 1. Introduction Firebird uses a page cache to hold pages in memory. It is much quicker to retrieve pages from RAM than to go out onto the disc

Der Firebird Cache-Buffer Norman Dunbar, Martin Köditz Version 1.2-de, 28. Mai 2020 Inhaltsverzeichnis 1. Einleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Der Firebird-Cache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Inhaltsverzeichnis 1 Kapitel 1. Einleitung Firebird nutzt einen Seiten-Cache (engl. page cache), um die Seiten im Speicher vorzuhalten. Diese sind deutlich schneller aus dem Arbeitsspeicher

agent figures out how to get from one location to another before actually moving. 8Cache-friendly design 9Cache-friendly design Program design focused on optimizing code by avoiding pathological affects computer system. 10Cache-friendly design - Random person on StackOverflow Modern memory pipelines are so complex you are basically optimizing for the cache 11Cache-friendly design 12Cache-friendly design design 13Cache-friendly design 14Cache-friendly design Accessing data means accessing memory through the cache 15Cache-friendly design Accessing data means accessing memory through the cache Running

HBASE-21879 Read HFile ’s Block into ByteBuffer directly. 1. Background For reducing the Java GC impact to p99/p999 RPC latency, HBase 2.x has made an offheap read and write path. The KV are allocated we’ll try to read the BucketCache firstly, if the Cache misses, go to the HFile and read the corresponding block. The workflow: reading block from cache OR sending cells to client, is basically not involved that the process of reading the Block from HFile is still copied to the heap firstly, the heap block won’t free unless the WriterThread of BucketCache flushes the Block to offheap IOEngine successfully

possible initialization parameters: block_start_string The string marking the beginning of a block. De- faults to '{%'. block_end_string The string marking the end of a block. Defaults to '%}'. variable_start_string newline after a block is re- moved (block, not variable tag!). Defaults to False. lstrip_blocks If this is set to True leading spaces and tabs are stripped from the start of a line to a block. Defaults to environment. cache_size The size of the cache. Per default this is 400 which means that if more than 400 templates are loaded the loader will clean out the least recently used template. If the cache size is

page_attribute "page_title" %} extracts the page’s page_title attribute. {% render_block "css" %} and {% render_block "js" %} are Sekizai template tags that load blocks of HTML defined by Django applications JavaScript, and requires these two tags. We recommended placing {% render_block "css" %} just before the tag, and and {% render_block "js" %} tag just before the . {% cms_toolbar %} renders the "page_title" %} {% render_block "css" %} {% cms_toolbar %} {% placeholder "content" %} {% render_block "js" %} TEMPLATES

page_attribute "page_title" %} extracts the page’s page_title attribute. {% render_block "css" %} and {% render_block "js" %} are Sekizai template tags that load blocks of HTML defined by Django applications render_block "css" %} {% cms_toolbar %} {% placeholder "content" %} {% render_block "js" %} recommended placing {% render_block "css" "css" %} just before the tag, and and {% render_block "js" %} tag just before the . {% cms_toolbar %} renders the django CMS toolbar. {% placeholder "content" %} defines a placeholder, where

{% render_block "css" %} {% cms_toolbar %} {% placeholder "content" %} {% render_block "js" %} This is worth explaining in page_attribute "page_title" %} extracts the page’s page_title attribute. • {% render_block "css" %} and {% render_block "js" %} are Sekizai template tags that load blocks of HTML defined by Django applications JavaScript, and requires these two tags. We recommended placing {% render_block "css" %} just before the tag, and and {% render_block "js" %} tag just before the . • {% cms_toolbar %} renders the

placeholder "splashbox" %} to the template’s HTML structure. You can add it anywhere, for example: {% block content %}

{% render_block "css" %} {% cms_toolbar %} {% placeholder "content" %} {% render_block "js" %} This is worth explaining in page_attribute "page_title" %} extracts the page’s page_title attribute. • {% render_block "css" %} and {% render_block "js" %} are Sekizai template tags that load blocks of HTML defined by Django applications JavaScript, and requires these two tags. We recommended placing {% render_block "css" %} just before the tag, and and {% render_block "js" %} tag just before the . • {% cms_toolbar %} renders the