user156224

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• Understanding Uint8Array Memory Blocks Usage: 3 Bytes Data Consuming 3 Blocks (14 bytes per block)

  in Bangle.js • 8 months, 2 weeks

  

  Thank you both...you really helped me a lot with your explanations.

• Understanding Uint8Array Memory Blocks Usage: 3 Bytes Data Consuming 3 Blocks (14 bytes per block)

  @user156224 started

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• Understanding Uint8Array Memory Blocks Usage: 3 Bytes Data Consuming 3 Blocks (14 bytes per block)

  in Bangle.js • 8 months, 2 weeks

  

  Thank you for the detailed explanation; it all makes sense now! I've included my code below where I store data in the "compressedData = []" array. Is there a way to save this data with fewer storage blocks or space?

  var lastTimestamp = 1692048524472;
  var lastElevation = 0;
  var compressedData = [];
  
  
  function compressData(sample) {
    // Split sample into timestamp and elevation
    var parts = sample.split("/");
    var timestamp = parts[0];
    var elevation = Math.round(parseFloat(parts[1]) * 100);
  
    // Calculate deltas
    var deltaTimestamp = (timestamp - lastTimestamp) / 10; // Time difference in tenths of milliseconds
    var deltaElevation = elevation - lastElevation;
  
    // Mask values
    deltaTimestamp &= 0xff;
    deltaElevation &= 0xffff;
  
    // Create buffer with 1 byte for timestamp delta and 2 bytes for elevation delta
    var buffer = new Uint8Array(3);
    buffer[0] = deltaTimestamp;
    buffer[1] = (deltaElevation >> 8) & 0xff;
    buffer[2] = deltaElevation & 0xff;
  
  	console.log("size = " + E.getSizeOf(buffer));
  	console.log("remaining blocks = " +process.memory().free);
    // Update last values
    lastTimestamp = timestamp;
    lastElevation = elevation;
    compressedData.push.apply(compressedData­, buffer);
  }
  
  setInterval(function(){
  compressData("1692048525472/294.35")
  },500);
  
  
  
  
  //the output is this:
  
  size = 3
  remaining blocks = 11820
  size = 3
  remaining blocks = 11817
  size = 3
  remaining blocks = 11814
  size = 3
  remaining blocks = 11811
  size = 3
  remaining blocks = 11808
  size = 3
  remaining blocks = 11805
  size = 3
  remaining blocks = 11802
  

• Understanding Uint8Array Memory Blocks Usage: 3 Bytes Data Consuming 3 Blocks (14 bytes per block)

  in Bangle.js • 8 months, 2 weeks

  

  Either by checking the free blocks before creating the array and after using "process.memory().free"
  or by using "E.getSizeOf(buffer)" and the answer is 3.

• Understanding Uint8Array Memory Blocks Usage: 3 Bytes Data Consuming 3 Blocks (14 bytes per block)

  in Bangle.js • 8 months, 2 weeks

  

  Thank you for your suggestions! I've tried both changing the variable name to 'b' and converting the three-byte array to a string using E.toString(). Unfortunately, neither approach seems to have reduced the number of blocks used.

• Understanding Uint8Array Memory Blocks Usage: 3 Bytes Data Consuming 3 Blocks (14 bytes per block)

  in Bangle.js • 8 months, 2 weeks

  

  I am working on a project where I generate data that initially occupies 17 bytes, and I compress it down to 3 bytes. These 3 bytes are then stored in a Uint8Array, as shown in the code snippet below:

  var buffer = new Uint8Array(3);
  buffer[0] = deltaTimestamp;
  buffer[1] = (deltaElevation >> 8) & 0xff;
  buffer[2] = deltaElevation & 0xff;
  

  I've noticed that this 3-byte array is taking up 3 blocks in memory, with each block being 14 bytes on my system. When I write this array to a binary file, the size of the file is just 3 bytes, as expected.

  I would like to understand why this 3-byte array is consuming 3 blocks instead of being represented within a single block, and if there's a way to optimize this. Any insights would be greatly appreciated. Thank you!