21:57 Messaging is not just for investment banks » High Scalability - Building bigger, faster, more reliable websites.

It seems that HTTP calls have become a default way to think about distributed systems. HTTP and Web services definitely have a lot to offer, but they are not the only way to do things and there are definitely cases where web is not the right choice. Unfortunately, lots of people just stick with web services and hack on, trying to fit a square peg in a round hole. In cases such as these, a different distribution paradigm can save us quite a lot of time and effort both in development and later in maintenance. One of those different paradigms is messaging.

17:31 Flickr:相機搜尋器 » Delicious/chedong
按照拍摄照片使用相机的频度的相机流行趋势统计
16:27 通过网站管理员工具改变您的网站设置 » 谷歌中文网站管理员博客


原文:One place for changing your site's settings
发表于:2008年12月4日星期四,下午5:03

网站管理员工具的有用特性之一就是能为您的网站调整设置,比如设置抓取速度或地理定位。我们一直致力于为您提供更多的设置,这些设置目前已经积累到可以成为一个单独的设置页面了。网站管理员工具现在为您提供了一个专门页,在那里您可以了解和调整您网站的有关设置。

已转到新的设置页面的设置项包括:

1. 目标地理区域
2. 首选域
3. 加入图片搜索
4. 抓取速度控制



改变设置

当您改变一项设置时,系统会向您提供保存或取消该项设置的选项。



请注意:这里的保存/取消选项是基于单个设置的,如果您改变了多项设置,您需要逐一点击相应的保存按钮。

设置的有效期
某些设置是有时效性的,也就是说,您的一些设置会在一段特定时间后失效。比如,抓取速度设置的有效期是90天。有效期过后,将自动恢复为默认设置。当您访问设置页面的时候,您可以在
相应的设置项下面看到该项设置的有效期。



关于新的设置页面就向您大致介绍到这里!

我们一直注意采纳您的建议,为网站管理员工具添加更多的功能,并使用户界面更加友好易用,欢迎您在网站管理员支持论坛中提问或提出您的宝贵建议!

10:21 网络广告管理系统的发展历程和趋势 » Inside AdSense-中文


通过上一篇文章,大家应该大致了解了 Google 广告管理系统。今天,我邀请我的同事 David 和大家分享一下网络广告行业和广告管理系统的发展历程及趋势。David 在 Doubleclick 从事广告管理系统相关的推广和咨询已经有7年的时间,对这一行业有相当深刻的认识。以下是他的介绍。

网络广告行业发端于1994年AT&T在HotWired网站上投放的一条旗帜广告。随着互联网在全球范围内高速发展,网络广告行业在初期阶段的发展主要以网站资源的增长为驱动力,为广告主提供了一个崭新的产品营销渠道。在这一时期,互联网广告作为传统产品营销的补充,被称为"第四媒体"。自2005年起,网络广告行业经过了10年的发展,各类网站资源已经日趋成熟,形成了行业准入门槛。优质的网站资源成为广告主追捧的对象,变为相对稀缺的资源,从而引发网络广告市场从买方市场转向卖方市场。

在这样的市场变化影响下,网络广告已经不是廉价营销渠道的代名词,网络媒体策划和产品营销人员需要更加细致的管理、进行及时的广告优化,确保网络广告资源被高效的使用。另一方面,对网站的管理者来说,需要更加灵活地组织和调配网站资源,在确保精确的广告投递的前提下,依托广告管理系统的技术基础,与销售团队进行深层次的整合,形成多样性的销售方案。

在市场的驱动下,网络广告管理系统演化为针对广告主和网站两种不同侧重点的系统。从网站角度出发,网络广告管理系统的重点是广告定向功能。下面,我们来简要了解一下针对网站的网络广告系统的特点和发展趋势。
以上就是关于网络广告行业的简单背景和广告管理系统发展趋势的介绍,希望它可以帮助大家更好的了解以后将要介绍的内容。
--------------------------------------------------------------
在 David 的介绍下,我相信大家对于广告管理系统的发展已经有了大致的了解。我将在以后的文章中,用三个章节向大家介绍 Google 广告管理系统如何在以上几个方面为发布商服务,真正做到提高效率,优化收益。
08:49 Lessons Learned at 208K: Towards Debugging Millions of Cores » High Scalability - Building bigger, faster, more reliable websites.

How do we debug and profile a cloud full of processors and threads? It's a problem more will be seeing as we code big scary programs that run on even bigger scarier clouds. Logging gets you far, but sometimes finding the root cause of problem requires delving deep into a program's execution. I don't know about you, but setting up 200,000+ gdb instances doesn't sound all that appealing. Tools like STAT (Stack Trace Analysis Tool) are being developed to help with this huge task. STAT "gathers and merges stack traces from a parallel application’s processes." So STAT isn't a low level debugger, but it will help you find the needle in a million haystacks.

Abstract:


Petascale systems will present several new challenges to performance and correctness tools. Such machines may contain millions of cores, requiring that tools use scalable data structures and analysis algorithms to collect and to process application data. In addition, at such scales, each tool itself will become a large parallel application – already, debugging the full BlueGene/L (BG/L) installation at the Lawrence Livermore National Laboratory requires employing 1664 tool daemons. To reach such sizes and beyond, tools must use a scalable communication infrastructure and manage their own tool processes efficiently. Some system resources, such as the file system, may also become tool bottlenecks.

In this paper, we present challenges to petascale tool development, using the Stack Trace Analysis Tool (STAT) as a case study. STAT is a lightweight tool that gathers and merges stack traces from a parallel application to identify process equivalence classes. We use results gathered at thousands of tasks on an Infiniband cluster and results up to 208K processes on BG/L to identify current scalability issues as well as challenges that will be faced at the petascale. We then present implemented solutions to these challenges and show the resulting performance improvements. We also discuss future plans to meet the debugging demands of petascale machines.

read more

01:47 Project Cartoon: How Projects Really Work (version 2.0) » Delicious/chedong
图简意赅

^==Back Home: www.chedong.com

^==Back Digest Home: www.chedong.com/digest/

<== 2009-01-05
  一月 2009  
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31  
==> 2009-01-07