Kyle Downey

JavaFX Composition

Groovy, FXML and dynamic layouts

This will be the first of a series of short articles on JavaFX, a worthy, underestimated successor to AWT and Swing JFC that probably came years too late to save Java desktop development from .NET and HTML5 but offers a clean rapid-development environment for the JVM:

  • the Java API is a step up from Swing -- less verbose; better . . .

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January 01, 2017


High performance networking for the JVM

The Z800 Needs a Friend (And a Power Supply)

In the springtime the dual GPU setup did in more than one power supply, including both an 850W and 1100W. I finally reached the conclusion back in May that the combination of NYC local electricity costs and the recurring cost of buying refurbished power supplies made ETH mining . . .

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December 24, 2016

Mining ether with cudaminer-frontier

Magical Internet money 2.0

Final build: Z800 workstation

The last couple of articles covered setting up a refurbished HP Z800 workstation for work on cryptocurrencies: adding RAID storage and putting in a pair of overclocked EVGA GTX 980 video boards to support GPU mining. The resulting machine is probably more power hungry than the ideal rig, but another way . . .

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October 11, 2015

Z800 mining rig ROI calculation

A computational home heating system

The replacement power supply -- the Z800's third one now -- arrived while we were on holiday, and so far seems to be running better. I decided to put it to the test by mining Dash and Ethereum in order to learn more about the mining process.

Running some numbers, one thing is clear: mining Dash at home with a GPU is a good way to . . .

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September 19, 2015

Dead PSU on the Z800

Reboot aborted

I decided to start over with a plain Debian install after wrestling with Solaris x86 and taking a break from coding at home. I hit the power button, which flashed briefly and then ... nothing, shut down. Reseated the PSU, and again no joy. Checked for bent pins or something dumb like a loose plug and all seemed fine.

The Z800 power . . .

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July 11, 2015


Low-latency messaging library

Martin Thompson's Strangeloop talk is worth watching for anyone interested in high-performance Java. Like Peter Lawrey's Chronicle Queue, Aeron's foundation is a low-latency append-only log, but even more ambitious. It is media-agnostic and --like ZeroMQ -- meant to be portable across languages, and he envisions supporting . . .

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February 28, 2015

SATA cable headaches

HP really doesn't want you to use a RAID card

The HP Z800 has four drive sleds accessible through the side panel. You can drop in a 3.5" drive and slide it in and it plugs into a SATA port at the back. These ports in turn go to four cables that can plug into the SAS or SATA ports on the bottom of the motherboard. Unfortunately the LSI controller in the Z800 is old and does not . . .

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February 21, 2015