Testing

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RandomFilesTester

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Purpose

• Verify file creation and writing operations
• Test filesystem behavior with many small files
• Validate file deletion operations
• Measure file I/O performance at scale

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Usage

RandomFilesTester.exe <FolderPath> <NumberOfFiles> [FileSize]

• FolderPath - Target directory where files will be created (e.g., R:\test)
• NumberOfFiles - How many files to generate
• FileSize - (Optional) Size of each file in bytes (default: 5120 bytes)

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Example

# Create 1000 random files of 5KB each in R:\test
RandomFilesTester.exe R:\test 1000

# Create 500 random files of 10KB each
RandomFilesTester.exe R:\test 500 10240

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How it works

1. The utility generates random binary data using a seeded random generator
2. Creates files named Random0.bin, Random1.bin, etc. in the target folder
3. Writes the random data to each file
4. Waits for user input (press any key)
5. Deletes all generated files when you press a key

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ConcurrencyStressTester

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Purpose

• Verify thread-safety of filesystem operations
• Test concurrent read/write operations
• Validate data integrity under concurrent access
• Stress test file creation, renaming, and modification operations

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Usage

ConcurrencyStressTester.exe <DurationSec> <Procedures>

• DurationSec - How long to run the stress test in seconds
• Procedures - Either all to run all tests, or a comma-separated list of procedure indices

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Available procedures

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0: FileCreator

• Creates files with random names and random content
• Verifies the written data can be read back correctly
• Deletes files and verifies deletion succeeded
• Tests basic file lifecycle operations

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1: FileRenamer

• Creates files and renames them
• Verifies file renaming operations
• Tests file metadata consistency

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2: ReadWrite

• Creates 5 files of approximately 500KB each
• Spawns 15 threads (3 threads per file)
• Each thread writes random 16-byte sections at different positions
• Immediately reads back written data to verify correctness
• Tests concurrent read/write operations and data integrity

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Examples

# Run all stress tests for 60 seconds
ConcurrencyStressTester.exe 60 all

# Run only FileCreator and ReadWrite tests for 30 seconds
ConcurrencyStressTester.exe 30 0,2

# Run only the ReadWrite procedure for 120 seconds
ConcurrencyStressTester.exe 120 2

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How it works

1. The tester displays available procedures and which are selected
2. Prompts you to press Enter to begin testing
3. Changes working directory to the target folder
4. Runs selected procedures concurrently for the specified duration
5. Each procedure runs in multiple threads, performing operations repeatedly
6. After each operation, verifies the results to ensure data integrity
7. Reports success or failure with detailed error information

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Running tests on your RAM disk

1. Mount the RAM disk:
   memefs-x64.exe -i -F NTFS -u "" -m R:
   
2. Navigate to the test directory:
   cd R:\
   mkdir test
   cd test
   
3. Run RandomFilesTester:
   RandomFilesTester.exe R:\test 1000
   
4. Run ConcurrencyStressTester:
   ConcurrencyStressTester.exe 60 all
   

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Interpreting results

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Success indicators

• RandomFilesTester: Successfully creates and deletes all files without errors
• ConcurrencyStressTester: Displays “Successfully done after [duration]” message
• No exceptions or error messages during execution

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Failure indicators

• Error messages about file creation or access failures
• VerifyException errors indicating data corruption
• Unexpected crashes or hangs
• Inconsistent file content when read back

• Memory corruption issues
• Thread-safety problems
• Filesystem operation bugs
• Resource exhaustion

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Additional testing

• Real-world usage scenarios (copying large files, running applications, etc.)
• Integration with Windows Explorer and other file managers
• Performance under sustained load
• Behavior when approaching memory limits
• Compatibility with various file types and applications