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What the Mean Really Means
When analyzing response time, or latency, you need much more information than an average provides. The average, commonly the arithmetic mean, shows the index of central tendency. But, as I found in...
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Memory Leak (and Growth) Flame Graphs
Memory Leak Memory Flame Graph Your application memory usage is steadily growing, and you are racing against time to fix it. This could either be memory growth due to a misconfig, or a memory leak...
View ArticleThe USE Method: Mac OS X Performance Checklist
In this post, I’ll provide an example USE Method-based performance checklist for the Apple Mac OS X operating system, for identifying common bottlenecks and errors. This draws upon both command line...
View ArticleThe USE Method: FreeBSD Performance Checklist
In this post, I’ll provide an example USE Method-based performance checklist for FreeBSD, for identifying common bottlenecks and errors. This is intended to be used early in a performance...
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The USE Method: Unix 7th Edition Performance Checklist
PDP 11/70 front panel (similar to the 11/45) Out of curiosity, I’ve developed a USE Method-based performance checklist for Unix 7th Edition on a PDP-11/45, which I’ve been running via a PDP simulator....
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The TSA Method
TSA Method in class (SmartOS) There are two basic performance analysis methodologies you can use for most performance issues. The first is the resource-oriented USE Method, which provides a checklist...
View ArticleOpen Source Systems Performance
There is an important and untold story about open source and systems performance, which I’m uniquely positioned to tell. I presented it at OSCON earlier this year, which was the perfect venue. My talk,...
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Systems Performance: available now
My new book Systems Performance: Enterprise and the Cloud is shipping now from your favorite online book supplier (informIT, amazon). Thanks to those who have ordered a copy! I’ve already received...
View ArticleBenchmarking the Cloud
Benchmarking, and benchmarking the cloud, is incredibly error prone. I provided guidance though this minefield in the benchmarking chapter of my book (Systems Performance: Enterprise and the Cloud);...
View ArticleAnother 10 Performance Wins
Following on from my earlier 10 performance wins post, here is another group of 10 I have worked on. # Target Analyzed Key Tool Fixed Specific Improvement 11 redis System DTrace System scheduler 41% 12...
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