JW3250F

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描述

JW3250F

 对于内存数据库来说,NVDIMM的作用与电池供电型RAM是类似的,但没有后者所需的电池及其缺点。McObject公司以前就做过这方面的努力,其eXtremeDB内存数据库系统可以与电池供电型RAM一起工作。公司很想将使用NVDIMM的内存数据库系统作为主要存储器。目前有多家供应商可以提供NVDIMM。我们使用AgigATech公司的产品对eXtremeDB进行了测试,因为我们非常熟悉AgigA公司的母公司——赛普拉斯半导体。同时我们把测试仅限于AgigA的NVDIMM(比如没有测试来自VikingTechnology和SmartModularTechnologies公司的NVDIMM),这主要是因为我们的时间和资源非常有限。因此本文中提到的测试只是从概念上证明,内存数据库系统可以与NVDIMM一起作为存储器,达到与使用传统DRAM相当的性能,并且能够利用NVDIMM的恢复功能恢复由于系统故障“丢失的”内存数据库。
测试还解决了在同时要求低延时和数据可恢复性的应用中使用内存数据库系统时经常出现的另外一个问题,即采用事务日志记录的内存数据库系统在多大程度上能保持其性能优于基于磁盘的数据库管理系统?对于后面这些涉及永久存储器(内存数据库系统的事务日志存储,以及在采用磁盘上的数据库管理系统情况下的整个数据库)的测试,存储“设备”包含了用AGIGARAMNVDIMM配置的RAM盘。下面给出了使用RAM盘而不是传统硬盘或固态硬盘的理由。测试中使用的AgigATech公司NVDIMM是设计用于Intel的Romley和Grantley平台(采用SandyBrdige、IvyBridge、Haswell和Broadwell处理器架构)的。McObject在IntelOakCreekCanyon参考主板中使用了4GBAGIGARAMDDR3-1600NVDIMM,以及Intel奔腾双核CPU1407@2.8GHz处理器和8GB的金士顿普通DDR3-1333DRAM,运行的是DebianLinux2.6.32.5操作系统。

产品承诺:
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保 证售后服务质量,
优势价格,大量现货。

主营DCS系统配件
机器人系统配件
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  专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。