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# 4x 1 chip (2 cores) per process:
os.environ["TPU_CHIPS_PER_HOST_BOUNDS"] = "1,1,1"
os.environ["TPU_HOST_BOUNDS"] = "1,1,1"
# Different per process:
os.environ["TPU_VISIBLE_DEVICES"] = "0" # "1", "2", "3"
# Pick a unique port per process
os.environ["TPU_MESH_CONTROLLER_ADDRESS"] = "localhost:8476"
os.environ["TPU_MESH_CONTROLLER_PORT"] = "8476"

# 1-liner for bash: TPU_CHIPS_PER_HOST_BOUNDS=1,1,1 TPU_HOST_BOUNDS=1,1,1 TPU_VISIBLE_DEVICES=0 TPU_MESH_CONTROLLER_ADDRESS=localhost:8476 TPU_MESH_CONTROLLER_PORT=8476

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AGX coherency, caching, and TLBs

These are just some notes on my current understanding of the subtleties of the AGX memory model and the TLB/caching issues I'm seeing.

GPU side

MMU (UAT)

The AGX MMU has 64 context slots (63 usable for user contexts). The page table base addresses are stored in a page (Apple calls it "TTBAT") in main memory. There are user and kernel halves (low and high), but we can ignore the high half from the GPU perspective since it is only used in very specific cases. The permission bits are funny and the same page tables are shared (and interpreted differently) by the ASC, but they are basically ARM page tables. Each context slot has an ASID (how many bits?), like a TTBR in ARM.

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

library Iterators {

    // Function types:
    // https://docs.soliditylang.org/en/latest/types.html#function-types
    function map(uint256[] memory input, function (uint256) internal pure returns (uint256) f)
        internal
        pure

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/**
 * General-purpose NodeJS CLI/API wrapping the Stable-Diffusion python scripts.
 *
 * Note that this uses an older fork of stable-diffusion
 * with the 'txt2img.py' script, and that script was modified to
 * support the --outfile command.
 */

var { spawn, exec } = require("child_process");
var path = require("path");

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import SwiftUI
import Charts
import Combine
import Foundation

final class GameState: ObservableObject {
    struct Player {
        var position: Int
        var halfSize: Int = 150

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How to update the Go version

System: Debian/Ubuntu/Fedora. Might work for others as well.

1. Uninstall the exisiting version

As mentioned here, to update a go version you will first need to uninstall the original version.

To uninstall, delete the /usr/local/go directory by:

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<div>
    <button class="pay-button">Pay</button>
    <div id="status"></div>
  </div>
  <script type="text/javascript">
    window.addEventListener('load', async () => {
      if (window.ethereum) {
        window.web3 = new Web3(ethereum);
        try {
          await ethereum.enable();

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details summary {
  cursor: pointer;
  outline: none !important;
  display: inline-block;
  padding: 8px 12px;
  padding-top: 10px;
  border-radius: 4px;
  overflow: hidden;
  background: #F09825;
  color: white;

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// Tracking cursor position in real-time without JavaScript
// Demo: https://twitter.com/davywtf/status/1124146339259002881

package main

import (
	"fmt"
	"net/http"
	"strings"
)

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• Working Memory 2.0: Earl K. Miller et al: Neuron
• Perceptual Cycles: Ruin VanRullen: CellPress
• Dynamics of Active Sensing and perceptual selection: Charles E Schroeder, et al: Current Opinion in Neurobiology
• Shifting the spotlight of attention: evidence for discrete computations in cognition: Buschman and Miller: Frontiers in Human Neuroscience
• A Dynamic Interplay within the Frontoparietal Network Underlies Rhythmic Spatial Attention: Fiebelkorn et al: Neuron