This is going to be another one of those “I better write this down before I forget” stories. Plus I get to talk about an algorithm that was named after me so what’s not fun about that?

First a motivational picture :D

OK so what is the Mariani-Silver algorithm, why…

I think I’ve told this story a bunch of times but I don’t think I’ve ever written it down so here goes.

You might have heard this description:

The Pit of Success: in stark contrast to a summit, a peak, or a journey across a desert to find victory through…

Continuing the with some more issues and followup.

This document focuses on tuning the VFS and running some additional experiments with lower level libraries.

Issue #11 : What factors are affecting IndexedDB performance the most?

What about deferred writes?

Consider the essential method in wa-sqlite/src/examples/IndexedDbVFS.js

_putBlock(store, file, index…

This is an exploration of using WASM to help with web product engineering. This document focuses on some of the initial questions which tell us if we have any hope of getting this idea off the ground at all. …

Sometimes people talk about making the Lab more like Production. Actually this is usually an anti-goal. That may sound surprising but consider this:


  • lots of users
  • lots of data samples
  • variable available memory
  • variable available disk
  • variable other things running on system
  • variable network quality
  • variable [other stuff]
  • metric goal…

UPDATE! Visual Studio goes 64 bit in !

This was one of my most contentious postings ever. I dug up an archived version because the original was deleted from MSDN. Many of my posting are archived there (e.g. ). But it seems some of…

The / thing is a serious case of legacy compat gone nuts. And it happens when you have an ecosystem and you need to keep things working in that ecosystem even as it evolves.

So, we have to go ALL the way back to CP/M an operating system most of…

I wanted to talk a little bit about securing C code, this came up a few weeks ago in a friendly twitter discussion and I said I would write something; so here it is.

Securing C is not an easy thing to do generally but we had pretty good success…

I’m a big fan of unit tests. Really. Big fan. Super big. Massive. Like, “make unit tests great again” massive. That.

So when I was working on my FB project () of course I invested in a lot of tests. In fact there is about as much test code as…

I thought I would write some notes on some old “networking” tech that I worked on in the early 80s. I have “networking” in quotes because it isn’t really like what you would call a modern network, this was more about sharing particular devices but in some sense the things…

Rico Mariani

I’m a software engineer at Facebook; I specialize in software performance engineering and programming tools generally. I survived Microsoft from 1988 to 2017.

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