TL;DR:

A minimal webserver achieved less than 5k concurrent requests / second, much below expectations. The reason: the logging configuration was invisibly consuming cycles.

Context

Last night I stumbled upon this post which outlined a performance issue related to JVM webservers. The post you're reading contributes nothing, it just serves …

My sister: "You need a hyperfixation interest. I think everyone needs one, actually. You need a deep dive rabbit hole."

1. Bird Watching
2. Beekeeping
3. Grilling
4. Smoking (meats)
5. Ted Cruz
6. Gun collecting
7. High-end Audio
8. Home Brew Smart Home
9. Coffee Roasting
10. Chocolate Making
11. Learn to recognize different species of cockroaches, so when someone …

On my drive across PA I visited the mythic Centralia. You can read up on the modern ghost town in any number of places. So here I'll share my photos and feelings of the place.

Centralia is an unassuming grid of overgrown streets tucked between the Pennsylvania hills. When I …

UUIDs are generally uncompressable. This is because their values can be anything and multiple UUIDs generaly don't repeat in a payload. So you may be surprised to learn that a JSON list of UUIDs compresses to 56% of their original size. Here's an example:

[
  "572585559c5c4278b6947144d010dad3",
  "b97ec0750f67468d964519e18000ccf6",
  "c1c69970b9bc4c0a9266a3350a9b2ab1",
  "2eb10805db484db7a196f89882d32142",
  "4b3569aaac154195aaa5ea114eff6566",
  "e253f04c1f414b7291e682ea465e8e19 …

A life full of activity is a fulfilling one. So the saying doesn't go. I made it up. And now that I have a car in the City of Steel I can fill my days with activities beyond food festivals and coffee shops. Here is a list of adventures now …

This is a simple strategy for confirming that some values are shared between requests. There must be a more 'correct' way to inspect values in concurrent requests, but I was unable to find it. I normally use a debugger to set breakpoints, but there was no way to set a …

I'm writing this post several months from when I visited Chaco Canyon. I visited Chaco Canyon in the first week of February on my drive up from Albuquerque to Monitcello. This was a beautiful drive.

I was listening to Brave New World as I passed valley and mountain. It just …

Yesterday I implemented a predicate to compute the min and max of a list. Today I'm doing the same, but now with constraints.

The code looks pretty much the same thanks to the handy min and max constraints.

:- use_module(library(clpfd)).

min_and_max([V], A, B) :-
    V #= A, V #= B.
min_and_max …

As a fun exercise I implemented a predicate to calculate the minimum and maximum element of a list.

min_and_max([A], A, A).
min_and_max([H|R], N, X):-
    min_and_max(R, RN, RX),
    N is min(H, RN),
    X is max(H, RX).

Next I wrote a version with last-call optimization.

min_and_max_2 …

It's been a year since I've written any Mercury (the purely logic/functional programming language), but there's one feature I miss. It's nothing fancy, and certainly one of the less interesting features Mercury has to offer.

The Problem

To understand this particular feature let's look at where other languages fail …