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Notice: get_bloginfo was called with an argument that is deprecated since version 2.2! The home option is deprecated for the family of bloginfo() functions. Use the url option instead. in /home/knmngmprl21d/public_html/blogs/wp-includes/functions.php on line 3551 http://dtrace.org/blogs/brendan/"> Disk I/O is still a common source of performance issues, despite modern cloud environments, modern fi

Notice: get_bloginfo was called with an argument that is deprecated since version 2.2! The home option is deprecated for the family of bloginfo() functions. Use the url option instead. in /home/knmngmprl21d/public_html/blogs/wp-includes/functions.php on line 3551 http://dtrace.org/blogs/brendan/"> I work at Joyent – a cloud computing company – doing performance analysis of small to large cloud env

Notice: get_bloginfo was called with an argument that is deprecated since version 2.2! The home option is deprecated for the family of bloginfo() functions. Use the url option instead. in /home/knmngmprl21d/public_html/blogs/wp-includes/functions.php on line 3551 http://dtrace.org/blogs/brendan/"> Since version 10.5 “Leopard”, Mac OS X has had DTrace, a tool used for performance analysis and troub

Longer summaries for each below. See the first post for notes on the above columns. Issues 13, 15, and 18 are for Linux instances under the KVM hypervisor (HW virtualization); the remainder are for SmartOS instances (OS virtualization). While I began documenting these performance wins to share the tools I was using, it’s also useful to consider the methodologies as well. I’ll mention key methodolo