Disk Performance Testing Tool

A simple Go-based utility for measuring disk I/O performance. The tool simulates various I/O workloads by reading from and writing to a test file.

Features

• Supports sequential and random I/O patterns.
• Configurable test parameters:
  • File size
  • Block size
  • Duration of the test
  • Parallelism (number of threads)
  • I/O mode: read, write, or mixed
  • Write-to-read ratio for mixed mode
• Outputs key performance metrics:
  • Total operations
  • Total data processed
  • Throughput in MB/s

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How It Works

1. File Setup:

   • A test file of a configurable size is created (default: 1GB).
   • The file is filled with test data to ensure realistic conditions for I/O operations.

2. Worker Threads:

   • Multiple worker threads operate in parallel, performing I/O operations based on the selected mode and parameters.
   • Each thread performs either:
     • Random I/O: Operations occur at random offsets within the file.
     • Sequential I/O: Operations proceed from the beginning of the file.

3. Modes of Operation:

   • Write: Threads write data blocks to the file.
   • Read: Threads read data blocks from the file.
   • Mixed: A configurable ratio determines the percentage of write versus read operations.

4. Metrics Calculation:

   • Total number of operations is counted.
   • Total amount of data processed is calculated.
   • Throughput is reported in MB/s based on the test duration.

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Usage

go run . [options]

Options

Flag	Default Value	Description
--filesize	testfile	Path to the test file.
--bs	4096	Block size in bytes.
--time	10	Test duration in seconds.
--threads	1	Number of parallel threads.
--mode	write	Mode of operation: read, write, or mixed.
--write-ratio	50	Write-to-read ratio for mixed mode (0-100).
--random	true	Use random I/O if true, sequential if false.
--size	1GB	Size of the file in bytes.

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Example

Run a test with the following parameters:

• File size: 2GB
• Block size: 4KB
• Duration: 15 seconds
• Parallelism: 4 threads
• Mixed mode with 70% writes and 30% reads
• Random I/O enabled

go run . --file testfile --bs 4096 --time 10 --threads 1 --mode write --write-ratio 60 --random --filesize 5G

Sample Output

Test completed:
Total Operations: 512345
Total Data: 2098764800 bytes
Throughput: 133.30 MB/s

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Notes

• The tool ensures the test file is large enough for realistic random access.
• Ensure adequate disk space is available before running tests.
• Performance may vary based on disk type, system load, and configuration.

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