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When you start optimizing a Rails application, the biggest problems you uncover are always query (or generally IO) related.

That is true, and that's probably also why the popular belief that Ruby performance doesn't matter much because it's all IO anyway is so commonplace. The other thing to bear in mind is that the average rails app doesn't have as heavily tuned database queries. Yeah, I think we're pretty much in agreement for either 2 or 3. If you work back through Amdahl's Law, you can produce the following table, to give you an idea of the tradeoffs here even in a low-I/O app: Thread Count If I round the numbers a bit, Noah's benchmark result could be said to show something like the expected speedup given by Amdahl's Law for a 25%-wait-in-I/O application (in the formula though, 25% wait-on-io translates to 25% improvement in throughput w/5 threads). These apps receive a 30 to 65% improvement (respectively) in throughput with 5 threads, w/roughly a 25% increase in memory usage. But perhaps it is better to keep Rails multi-threaded by default, so that those bugs can occur and be seen and fixed often and early? What bugs would slip through is Rails became single-thread by default I chose the default of 5 in Puma based on the benefit for a Rails app with 25-50% time spent in I/O wait (based on my experience looking at 100+ Rails apps perf dashboards, this covers 80% or more of prod apps). Of course, the second thread is the most costly thread of all: now you're multi-threaded, with all the bugs that can cause. Amdahl's Law shows that modest throughput gains can be obtained even when small parts of the program can be done in parallel - for example, a Rails application that spends 30% of it's time waiting on I/O will have 18% higher throughput with 2 threads than with 1. Noah's result accords pretty well with Amdahl's Law. It still spends 25% of its time waiting on I/O. I would certainly consider Discourse a highly-optimized Rails app, maybe one of the most highly optimized in the world. One benchmark I recall of his showed that throughput on Discourse improved 25% when going from 1 to 5 threads. Because they could reach out and touch us.Worked on this for many years (although his work stopped ~3 years ago after losing sponsorship). Looking back, I’m reminded that my parents would do anything to help my brother and me - despite our geeky habit of showing off our double-jointedness.īecause they knew us so intimately.

THUMBS UP LINE DRAWING TV

We see suffering children on TV - on our computers - and whenever we turn on YouTube.īut we cannot reach out and touch them, so reality doesn’t always sink in.Ĭan we take the leap to help those that we do not know? Sometimes, it’s hard to relate to those whose culture and traditions - differ from ours - such as in Haiti. It is easy to forget that so many linger in a nightmare of disease, malnutrition, and violence in faraway places. Easy to want good care for myself and my loved ones. It’s easy for me to take good health care for granted. Farmer - a physician and medical anthropologist - argues that everyone should have decent health care. Paul Farmer’s quest brought health care to Haiti’s poor and other parts of the world.ĭr. Paul Farmer, A Man Who Would Cure the World” (2003) by Pulitzer Prize-winning journalist Tracy Kidder.

This question came to mind as I read “Mountains Beyond Mountains: The Quest of Dr. What would having a sick or injured family member be like without medical care? I think of this now as I reflect on how fortunate I have been to have good, affordable medical care for my family and myself. The doctor remedied the elbow with a simple twist.Įven though I generally remember details of my kids’ accidents and traumas, I draw a blank when it comes to the rest of that medical saga. (Did I drink the vodka instead of giving it to Claire?) (This sounds like Frontier Medicine, but it happened in 1959 in Palo Alto, now the hub of Silicon Valley.)Ĭlaire’s elbow was dislocated. I called our pediatrician, who told us to give Claire a small shot of vodka in orange juice and to meet at his office.

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