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Displaying posts with tag: Brendan Gregg (reset)

More on measuring IO latency
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To follow on to my earlier links to Brendan Gregg’s blog posts on measuring I/O latency, there is a third one discussing DTrace, and then a very detailed response from Mark Leith showing how to do it with the PERFORMANCE_SCHEMA in MySQL 5.5.

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  1. Disk latency versus filesystem latency
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Disk latency versus filesystem latency
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Brendan Gregg has a very good ongoing series of blog posts about the importance of measuring latency at the layer that’s appropriate for the question you are trying to answer. If you’re wondering whether I/O latency is a problem for MySQL, you need to measure I/O latency at the filesystem layer, not the disk layer. There are a lot of factors to consider. To quote from his latest post:

This isn’t really a problem with iostat(1M) – it’s a great tool for system administrators to understand the usage of their resources. But the applications are far, far away from the disks – and have a complex file system in-between. For application …

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