Technical Notes

This collect together various technical descriptions of how TotalDepth solves certain problems.

Contents:

• Performance of TotalDepth
  • Measuring Performance
    • User’s Perception of Performance
    • Performance Improvements
• LAS Performance
  • Reading LAS Files
• Indexing LIS Files
  • Introduction
  • Indexing Design
    • Indexing a LIS File
    • Indexing a Log Pass
    • Run Length Encoding of Logical Records
    • Indexing Frame Data
  • Indexing Performance
    • Index Time
    • Multi-Processing
    • Index Size
    • Indexing Performance Improvements
    • LIS Read Performance via an Index
    • Summary
• LIS Performance
  • File Read Cost
    • Raw File Read
    • Raw File seek()
    • Using the struct module
    • Reading Rep Code 68
    • Cython vs Python
  • Frame Read Cost
    • A: All Frames, all Channels
    • C: Adjacent Frames and Channels
    • D: Adjacent Frames, any Channels
    • E: Any Frames, any Channels
    • All Measurements
  • Performance Improvements
• Indexing RP66V1 Files
  • Low-Level Index
    • Execution Time
    • Index Size
    • Memory and CPU Usage
    • Multiprocessing
  • Mid-Level Index
    • Execution Time
    • Index Size
    • Memory and CPU Usage
    • Multiprocessing
• RP66V1 Performance
  • Scanning RP66V1 to produce an HTML Summary
    • Performance Improvements
  • Converting RP66V1 to LAS
    • An Example File
    • Processing the Test Archive to LAS
    • Sub-sampling
    • Multi-Processing
• Plotting Wireline Data
  • Wireline Files With Integral Plot Data
    • LIS Plot Specification
  • Wireline Files With External Plot Data
    • LgFormat XML Files
  • Internal Plot Algorithms
    • Plotting the Legends (Scales)
    • Interpolating Backups
• Data Quality
• TotalDepth and SaaS
  • Processing Server Side Files
  • Processing Files that Remain on the Client’s Device
    • Starting the session
    • Rest of Session
    • Data Persistence
  • SaaS Pros and Cons
    • Advantages
    • Disadvantages
• Process Monitoring with TotalDepth.common.process
  • Command Line Tools
  • Plotting the Data
    • Example
  • Adding Events as Graph Labels
    • A Real World Example
• Performance Graphs via Gnuplot with TotalDepth.util.gnuplot
• Total Depth and Units
  • LIS Units
  • General Units
    • Unit Code
    • Standard Form
    • Internal Representation of the Data
    • Units Conversion
• Schlumberger Mnemonics