sum(irate

Instrumenting Requests

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Base issuance33.6B CKB in total will be issued. Annual base issuance halves every 4 years

We’ve even built a Python library to help us generate these dashboards: GrafanaLib.

The policeman can't find them either, and asks if he lost them under the streetlight. The drunk replies: "No, but this is where the light is best."

In America, the number of searches at the time of the lockdown in 2020 for boredom rose by 57 percent, loneliness by 16 percent and worry by 12 percent.

in Europe at the time of the lockdown in 2020 for boredom rose by 93 percent, loneliness 40 percent and worry 27 percent

Sidenote: There is tooling out there that attempts to automate the above form of mutation testing.

researchers have built an online tool, Exposing.AI, that lets people search many of these image collections for their old photos.

Today, we’re excited to release Diffy, an open-source tool that automatically catches bugs in Apache Thrift and HTTP-based services.

Iago is a load generator

The HHVM team recommends that you warm up your HHVM process before having it serve production traffic

It can do this thanks to curl_multi. Matt Graham’s talk “Concurrent PHP in the Etsy API” from phpDay 2014 goes into more detail on how we use curl_multi.

To address this, we built our top-level dashboards using Cubism

Each client keeps track of the number of outstanding outbound requests on a per-service basis. When new requests are sent, if the number of outstanding requests to that service exceeds a configurable number, the request is immediately marked as an error.

Facebook's open source Wangle library5 provides an implementation of this algorithm which is used by our Thrift4 framework.

We experimented with a variant of the CoDel1 (controlled delay) algorithm:

onNewRequest(req, queue):

  if (queue.lastEmptyTime() < (now - N seconds)) {
     timeout = M ms
  } else {
     timeout = N seconds;
  }
  queue.enqueue(req, timeout)

To run this you will need the FaaS CLI.

Function as a Service should be easy. Here comes faasd into play.

I was surprised to see that it has built-in message queue implementation. It’s only about 300 LOC and one file

I stumbled upon a Redis library for Clojure which is called carmine.

Goroutines: 11.157259715s total, 11.157259ms avg per iterationTokio Tasks: 19.853376396s total, 19.853376ms avg per iterationRust Threads: 25.489677864s total, 25.489677ms avg per iteration

Netflix’s NDBench is another open source tool for load testing data stores

mzbench really is the best in class for generating load, and supports a wide variety of protocols

There’s no dearth of open source load testing tools and frameworks, the most popular ones being Apache Bench, Gatling, wrk2, Erlang based Tsung, Siege, Scala based Twitter’s Iago

德勒兹曾说：「世上只有一种反对是有效的，那就是，说明对方提出的问题不是好问题，应该换个方式来提」。