Gil Tene’s “usual suspects” to reduce system-level hiccups/latency jitters in a Linux system
Based on empirical evidence (across many tens of sites thus far) and note-comparing with others, I use a list of “usual suspects” that I blame whenever they are not set to my liking and system-level hiccups are detected. Getting these settings right from the start often saves a bunch of playing around (and no, there is no “priority” to this – you should set them all right before looking for more advice…).
(tags: performance latency hiccups gil-tene tuning mechanical-sympathy hyperthreading linux ops)
I think that materiality means what it says, and if people or algorithms do dumb things with trivial information that’s their problem. But markets are a lot faster and more literal than they were when the materiality standard was created, and I wonder whether regulators or courts will one day decide that materiality is too reasonable a standard for modern markets. The materiality standard depends on the reasonable investor, and in many important contexts the reasonable investor has been replaced by a computer.
(tags: algorithms trading stock stock-market sec materiality april-fools-day tesla investing jokes)
Time Series Metrics with Cassandra
slides from Chris Maxwell of Ubiquiti Networks describing what he had to do to get cyanite on Cassandra handling 30k metrics per second; an experimental “Date-tiered compaction” mode from Spotify was essential from the sounds of it. Very complex :(
(tags: cassandra spotify date-tiered-compaction metrics graphite cyanite chris-maxwell time-series-data)
you can use 2-liter carbonated drink bottles to build an inexpensive, reusable water rocket. The thrill factor is surprisingly high, and you can fly them all day long for the cost of a little air and water. It’s the perfect thing for those times when you just want to head down to the local soccer field and shoot off some rockets!