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37 days ago by smp

There will be GrabPERF downtime on May 29-30 2009 as Technorati completes its colocation relocation process. [ here] There is no set time for the outage or its length, as the machines have to be physically relocated to the new datacenter, and then integrated into the new network configuration. I wil ...

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101 days ago by smp

Tonight, I figured out how to add the Resolved IP Addresses for a host to measurement data and store that information for further debugging. It was very simple - I was trying to find complex solutions to this issue. Turns out the solution is built right into PERL: The Socket module. My thought is th ...

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103 days ago by smp

This afternoon, the two GrabPERF Agents at Technorati were switched back to using their local copies of caching BIND for resolving DNS entries. Some folks at Microsoft who stopped by to look at their results on the Search Performance Index noticed that there were one or two outliers in the results f ...

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103 days ago by smp

Using the visitor trending data collected and shared by StatCounter, I have undertaken a general analysis of browser distribution by global region. These metrics are collected using the embedded tags that StatCounter customers embed on their site to collect visitor metrics for their own use. US data ...

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111 days ago by smp

Today I would like to announce the availability of the GrabPERF Search Performance Index. The goal of the index is to provide performance metrics for a group of search providers around the world. The results are based on a direct HTTP GET request being made for the search results page by the GrabPER ...

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114 days ago by smp

Over the last seven days, GrabPERF has been running in a very unstable state. This appears to be directly related to the use of InnoDB as the DB engine on a few of the larger tables in the database. Today, the system was offline for several hours before I noticed that the DB had failed to restart pr ...

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122 days ago by smp

One additional changes was made to GrabPERF today. The homepage with the Top and Bottom Performers, has been changed from a dynamic page to one that is autogenerated every two minutes. This graph should explain why. The dynamic page was starting to push 20-25 seconds just for the Top 20 List. When I ...

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122 days ago by smp

Today we undertook two maintenance and upgrade tasks at GrabPERF that have been neglected for too long. The Agent code was streamlined and removed the connection error sub-routine. It seems that the latest versions of cURL no longer support the connection error determination (I can only imagine the ...

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124 days ago by smp

The GrabPERF Retail Web Performance Index is an extension of the Holiday Performance Index created for the Black Friday/Cyber Monday craze in 2008. There is a methodology statement explaining more about the index below the data table. Please add any comments or questions to this post.

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124 days ago by smp

On the weekend, I upgraded the database engine for GrabPERF to Mysql 5.1 and switched the main data table from MyISAM to InnoDB. The switch to InnoDB was done because of the locking issues that were occurring during long queries, especially when doing ad-hoc analysis. The row-level (versus table-lev ...

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