block

How do I remove the visibility of spaces between inline elements?

无人久伴 提交于 2020-01-10 05:05:08
问题 Say I have several inline-block div tags, like this <div class="image"> </div> <div class="image"> </div> class image just sets their size to 100x100 and a gray background color. Their margin and borders are set to 0, and yet there is spacing between the two rectangles. If I write the HTML such as this, however: <div class="image"> </div><div class="image"> </div> Removing all whitespace between the divs, the spacing disappears. Since I don't want to write my HTML like that, I'm thinking that

关键数据结构

☆樱花仙子☆ 提交于 2020-01-10 02:57:42
FSDirectory NIOFSDirectory 性能对比 lucene/solr FSDirectory NIOFSDirectory 性能测试对比与Http11NioProtocol 文章分类:互联网 lucene 2.4 开始有一个 NIOFSDirectory 实现,使用 java.nio's FileChannel 读取文件。官方说:在大多数非 windows 平台下,多个线程共用单个 searcher 比 FSDirectory(在同一时刻只能一个线程使用 searcher)可以提高查询的吞吐量。 lucene 2.4 的 CHANGE.TXT 说明: 21. LUCENE-753: Added new Directory implementation org.apache.lucene.store.NIOFSDirectory, which uses java.nio's FileChannel to do file reads. On most non-Windows platforms, with many threads sharing a single searcher, this may yield sizable improvement to query throughput when compared to FSDirectory, which

What is the purpose of using blocks

倾然丶 夕夏残阳落幕 提交于 2020-01-09 12:38:07
问题 I want to use blocks in my application, but I don't really know anything about blocks. Can anyone explain how and why I should use blocks in my code? 回答1: Blocks are closures (or lambda functions, however you like to call them). Their purpose is that using blocks, the programmer doesn't have to create named functions in the global scope or provide a target-action callback, instead he/she can create an unnamed, local "function" which can access the variables in its enclosing scope and easily

gridDim blockDim 的关系

落爺英雄遲暮 提交于 2020-01-08 18:25:20
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 核函数被调用时通过<<<grid, block>>>进行设置和函数并行执行的线程个数,grid和block可以时三维的xyz,通过dim3进行定义。 如: dim3 grid=dim3(5,3); 下图所示: 上图中grid为dim3(2, 3), block为dim3(3,5),注意排列时从上到下再从左到右。 grid对应的 gridDim.x = 2 gridDim.y = 3 gridDim.z = 1 block对应的 blockDim.x = 3 blockDim.y = 5 blockDim.z = 1 假设我们要计算Block(1,1)所在的Thread(3,2)随对于的id号,可以通过下面的公式: #define get_tid() ((gridDim.x*blockIdx.y + blockIdx.x)*blockDim.x + threadIdx.x) 对于Block(1,1)-Thread(3,2)而言,blockIdx.x=1 blockIdx.y=1 threadIdx.x=3, threadIdx.y=2 因此get_tid()的值为: (2*1 + 1)*3 + 3 = 12 来源: oschina 链接: https://my.oschina.net/u/4228078/blog

压缩表

☆樱花仙子☆ 提交于 2020-01-07 21:48:12
1、mysql的版本需要大于5.5; 2、set global innodb_file_per_table=1; 3、create table或者alter talble 增加 ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8; 根据经验,一般压缩比例可以达到30%-40%。 如果指定ROW_FORMAT = COMPRESSED,则可以省略KEY_BLOCK_SIZE; KEY_BLOCK_SIZE设置默认为innodb_page_size值的一半。 如果指定有效的KEY_BLOCK_SIZE值,则可以省略ROW_FORMAT = COMPRESSED; 压缩会自动启用。 (innodb_file_format=Barracuda) CREATE TABLE t1 (c1 INT PRIMARY KEY) ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8;对于压缩表,可以在建表时指定block size,但在内存中表现的解压页依旧为统一的页大小 ################### 来源: https://www.cnblogs.com/igoodful/p/12163595.html

AutoSAR系列讲解(实践篇)11.2-存储处理与Block

倖福魔咒の 提交于 2020-01-07 19:08:08
AutoSAR系列讲解(实践篇)11.2-存储处理与Block 存储处理与Block 一、NVRAM Block NVRAM Block的类型 二、Fee Block 三、Ea Block 四、总结 存储处理与Block ->返回总目录<- 同通信的PDU一样,存储功能也需要一些特殊的数据结构来存放和管理我们的NV数据(NV data) 一、NVRAM Block NVRAM Block的作用类似于IPDU,但它们两仅仅只是作用上相似,其功能实现是完全不同的。首先用户是不可能直接操作NV Memory的,所以肯定需要开辟一块RAM区域用于暂存我们的NV data;然后我们的数据需要校验,那么肯定需要有一个空间来存放我们的校验是否正确等必须信息;假如校验出错,我们还需要从某个地方获取该值的默认数据以作为错误处理。所以我们的NVRAM Block就被AutoSAR设计成下面这样了: 来源: CSDN 作者: 雪云飞星 链接: https://blog.csdn.net/xyfx_fhw/article/details/103875270

iOS 消息的传递机制

烂漫一生 提交于 2020-01-07 13:14:57
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 转载原地址:http://beyondvincent.com/blog/2013/12/14/124-communication-patterns/ 注1:本文由破船译自 Communication Patterns 。 本文目录如下所示: 可用的机制 做出正确的选择 Framework示例 小结 每个应用程序或多或少,都由一些松耦合的对象构成,这些对象彼此之间要想很好的完成任务,就需要进行消息传递。本文将介绍所有可用的消息传递机制,并通过示例来介绍这些机制在苹果的Framework中如何使用,同时,还介绍了一些最佳实践建议,告诉你什么时机该选择使用什么机制。 虽然这一期的主题是关于Foundation Framework的,不过本文中还介绍了一些超出Foundation Framework(KVO和Notification)范围的一些消息传递机制,另外还介绍了delegation,block和target-action。 大多数情况下,消息传递该使用什么机制,是很明确的了,当然了,在某些情况下该使用什么机制并没有明确的答案,需要你亲自去尝试一下。 本文中,会经常提及接收者[recipient]和发送者[sender]。在消息传递机制中具体是什么意思,我们可以通过一个示例来解释:一个table view是发送者

How to select policy of block placement in the DataNode?

房东的猫 提交于 2020-01-07 05:54:10
问题 If the block replication is 3 in my hadoop cluster,and every DataNode has 3 ${dfs.data.dir} directories. When the DataNode is choosed to storage block, the block is storage in all 3 direcoties or one of them? If the answer is latter, how to choose a ${dfs.data.dir} directory? 回答1: The right directory is chosen on round robin manner when the block arrives to the datanode. You can alter this behavior by changing dfs.datanode.fsdataset.volume.choosing.policy to org.apache.hadoop.hdfs.server

How to select policy of block placement in the DataNode?

拥有回忆 提交于 2020-01-07 05:54:09
问题 If the block replication is 3 in my hadoop cluster,and every DataNode has 3 ${dfs.data.dir} directories. When the DataNode is choosed to storage block, the block is storage in all 3 direcoties or one of them? If the answer is latter, how to choose a ${dfs.data.dir} directory? 回答1: The right directory is chosen on round robin manner when the block arrives to the datanode. You can alter this behavior by changing dfs.datanode.fsdataset.volume.choosing.policy to org.apache.hadoop.hdfs.server