Last week we were busy to align XtraDB performance with 5.4, now we have some results. Currently it is available as “hacks” to XtraDB (available on Lauchpad lp:~percona-dev/percona-xtradb/hacks-porting-tune if you are interested). Basically we took improvements from 5.4 and backported ones performance related to XtraDB.

Here are results for tpcc-like workload, 100W (~10GB) ( raw results and parameters are available here
http://spreadsheets.google.com/ccc?key=rxUEhM2dqbX0uAfq9j6WQ_w ). Box Dell PowerEdge R900 (Does Dell have referral program ? ), with RAID10 (8 disks) on ext3, 32GB of RAM.

As you see there almost no difference and you may say what’s the reason in XtraDB ? The most interesting reason is XtraDB based on InnoDB-plugin and contains its nice features like FAST INDEX CREATION and dynamic pages. And XtraDB has some parameters like “adaptive_checkpoint” and control of “read_ahead”. And if in the same benchmark you disable read-ahead (innodb_read_ahead=none), you can see improvement about 15%

Actually control of read_ahead is very simple patch and can easily be included in 5.4 or InnoDB-plugin.

For curiosity I run the same benchmarks on ext3 vs xfs on SSD card, the results are:

Interesting facts:
- xfs is 25% faster ext3
- the gaps on SSD is more visible than on RAID10
- in the same time gaps can be smoother with disabled read_ahead, however disabling it does not show such improvement like on RAID10

I should mention I have strange results on xtradb running it on xfs on RAID10, I have results about 2times slower than for ext3. I am not sure yet - is it xtradb or xfs problem, and why it appears only on RAID10, but not SSD.

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Entry posted by Vadim | One comment

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作者 AdSense 支持小组

Google AdWords在上个月发布了多媒体广告制作工具，此工具提供了丰富的多媒体广告模版，广告商只需要花1分钟，就可以制作出精美的多媒体广告。



这个工具的推出得到了广告商的热烈响应和欢迎。现在，已经有越来越多的广告商开始投放多媒体广告了！这对于发布商来说是一个新的机遇。

现在，您只需通过一些简单的调整，就可以抓住这个机遇，赢得更多的多媒体广告资源，提高网站收益：

第一步：调整投放广告单元的尺寸。

支持多媒体广告的格式有728X90，160X600，300X250，336X280，250X250，200X200，
120X600，468X60。如果您现在网站投放的广告单元不是这些格式，请立即重新生成并投放上面列出的广告尺寸。

第二步：确保选择支持图片格式广告。

• 如果您需要调整广告尺寸，则需要重新生成广告代码，您可以在生成的步骤中选择“文字与图片广告（默认）”选项；
• 如果您现在投放的广告尺寸就是支持图片广告的尺寸，就可以直接在“管理广告”中进行调整，如下图所示：如果广告单元的“内容”一栏显示的是“文字与图片广告”，则表示您已经选择了支持图片广告，不需要任何调整。如果显示的是“仅文字广告”或“仅图片广告”，您可以点击右侧的“修改广告设置”，将广告单元设置改成“文字与图片广告”。

完成上面的步骤以后，就可以把新的广告代码添加到网页了，通过这些调整，可以确保多媒体广告能够在您的网站上展示，这样就不会错过任何多媒体广告资源了。

Last week we announced some new features in Analytics including pivoting, secondary dimensions and the option to share customizations (like Advanced Segments). These features will be rolling out to everyone over the next few weeks. In anticipation of the release, we'd like to announce a contest for the coolest, most useful Advanced Segments. For example, one of the engineers from Google's mobile team created a segment for iPhone users that's now available to everyone.




The winning segment should be applicable to a wide audience and have a clear use case. If you can explain how you've used the segment to increase your website ROI, that's even better.

The winner will receive a Google Analytics teeshirt, stickers, a GAIQ voucher and a shower of praise on the blog. We'll even email your boss to tell him or her about your Google Analytics mastery. Once the new features launch for everyone, we'll follow up with a request for URLs, so get your segments ready today!

Check out this post for more information on how to configure Advanced Segments.

Posted by Sebastian Tonkin, Google Analytics Team

GemFire Enterprise is in-memory distributed data management platform that pools memory (and CPU, network and optionally local disk) across multiple processes to manage application objects and behavior. With the 6.0 release, GemFire has reached a stage of maturity in its evolution. GemStone touts this version as the true 'best of breed' distributed caching technology, solving scalability issues in all industries.