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docs/environment.md

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# Environment Variables
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MDIO can be configured using environment variables to customize behavior for import, export,
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MDIO can be configured using environment variables to customize behavior for import, export,
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and validation operations. These variables provide runtime control without requiring code changes.
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## CPU and Performance
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**Type:** Integer
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**Default:** Number of logical CPUs available
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Controls the number of CPUs used during SEG-Y export operations. Adjust this to balance
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Controls the number of CPUs used during SEG-Y export operations. Adjust this to balance
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performance with system resource availability.
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```shell
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**Type:** Integer
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**Default:** Number of logical CPUs available
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Controls the number of CPUs used during SEG-Y import operations. Higher values can
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Controls the number of CPUs used during SEG-Y import operations. Higher values can
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significantly speed up ingestion of large datasets.
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```shell
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**Type:** Float
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**Default:** 2.0
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Sparsity ratio threshold that triggers warnings during grid validation. The sparsity ratio
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measures how sparse the trace grid is compared to a dense grid. Values above this threshold
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Sparsity ratio threshold that triggers warnings during grid validation. The sparsity ratio
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measures how sparse the trace grid is compared to a dense grid. Values above this threshold
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will log warnings but won't prevent operations.
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```shell
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**Type:** Float
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**Default:** 10.0
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Sparsity ratio threshold that triggers errors and prevents operations. Use this to enforce
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quality standards and prevent ingestion of excessively sparse datasets that may indicate
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Sparsity ratio threshold that triggers errors and prevents operations. Use this to enforce
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quality standards and prevent ingestion of excessively sparse datasets that may indicate
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data quality issues.
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```shell
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**Default:** false
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**Accepted values:** `true`, `false`, `1`, `0`, `yes`, `no`, `on`, `off`
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When enabled, preserves the original SEG-Y textual file header during import.
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When enabled, preserves the original SEG-Y textual file header during import.
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This is useful for maintaining full SEG-Y standard compliance and preserving survey metadata.
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```shell
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**Type:** String (file path)
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**Default:** None
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Path to a custom SEG-Y specification file that defines byte locations and data types for
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Path to a custom SEG-Y specification file that defines byte locations and data types for
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trace headers. Use this to handle non-standard SEG-Y variants or custom header layouts.
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```shell
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**Default:** false
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**Accepted values:** `true`, `false`, `1`, `0`, `yes`, `no`, `on`, `off`
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Enables buffered reads during SEG-Y header scans to optimize performance when reading from or
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writing to cloud object storage (S3, GCS, Azure). This mode balances bandwidth usage with read
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latency by processing the file twice: first to determine optimal buffering, then to perform the
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Enables buffered reads during SEG-Y header scans to optimize performance when reading from or
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writing to cloud object storage (S3, GCS, Azure). This mode balances bandwidth usage with read
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latency by processing the file twice: first to determine optimal buffering, then to perform the
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actual ingestion.
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```{note}
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This variable is designed for cloud storage I/O, regardless of where the compute is running.
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```
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**When to use:**
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- Reading from cloud storage (e.g., `s3://bucket/input.segy`)
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- Writing to cloud storage (e.g., `gs://bucket/output.mdio`)
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**When to skip:**
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- Local file paths on fast storage
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- Very slow network connections where bandwidth is the primary bottleneck
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**Default:** false
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**Accepted values:** `true`, `false`, `1`, `0`, `yes`, `no`, `on`, `off`
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Bypasses validation checks during MDIO operations. This is primarily intended for development,
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Bypasses validation checks during MDIO operations. This is primarily intended for development,
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testing, or debugging scenarios where you need to work with non-standard data.
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```{warning}
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Disabling checks can lead to corrupted output or unexpected behavior. Only use this
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Disabling checks can lead to corrupted output or unexpected behavior. Only use this
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when you understand the implications and are working in a controlled environment.
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```
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To make environment variables permanent, add them to your shell profile:
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**Bash/Zsh:**
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```shell
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# Add to ~/.bashrc or ~/.zshrc
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export MDIO__IMPORT__CPU_COUNT=16
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export MDIO__IMPORT__CLOUD_NATIVE=true
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```
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**Windows:**
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```console
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# Set permanently in PowerShell (run as Administrator)
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[System.Environment]::SetEnvironmentVariable('MDIO__IMPORT__CPU_COUNT', '16', 'User')
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MDIO__GRID__SPARSITY_RATIO_LIMIT=15.0
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MDIO__IMPORT__CLOUD_NATIVE=true
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```
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