79 lines
2.2 KiB
Markdown
79 lines
2.2 KiB
Markdown
# Test Case: LZ4 Compression Large File Handling
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**Test ID**: TC085-lz4-large-file
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**G5 fixture contract**: Use [G5-MANUAL-SETUP.md](G5-MANUAL-SETUP.md).
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Its generated paths, source comparisons, structured corruption offsets, and
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cleanup rules supersede placeholder examples in this file.
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**Category**: Compression
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**Priority**: High
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**Regression**: None
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## Objective
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Verify LZ4 decompression correctness for large files (>100MB).
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## Preconditions
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- Generated image: `images/lz4-large.erofs`
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- Test file: `/large.bin`, exactly 268435456 bytes
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- Reference: `sources/large/large.bin` and its generated SHA256
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- Mount point: `/mnt/test`
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## Test Steps
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1. Mount the image:
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```
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mount -t erofs /dev/md0 /mnt/test
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```
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2. Verify file size reported correctly:
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```
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stat -f %z /mnt/test/files/large-lz4.bin
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```
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3. Read entire file and compute checksum:
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```
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sha256 -q /mnt/test/large.bin
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sha256 -q sources/large/large.bin
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cmp sources/large/large.bin /mnt/test/large.bin
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```
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4. Test partial reads at various offsets:
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```
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read_probe pread /mnt/test/large.bin 52428800 10485760 guest.bin
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read_probe pread sources/large/large.bin 52428800 10485760 source.bin
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cmp source.bin guest.bin
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read_probe pread /mnt/test/large.bin 209715200 10485760 guest.bin
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read_probe pread sources/large/large.bin 209715200 10485760 source.bin
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cmp source.bin guest.bin
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```
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5. Test random access reads:
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```
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# Compare both guest ranges with the same source offsets.
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read_probe pread /mnt/test/large.bin 4096000 4096 chunk1
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read_probe pread /mnt/test/large.bin 204800000 4096 chunk2
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```
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## Expected Results
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- Step 2: Size is 268435456 bytes (256MB)
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- Step 3: Checksum matches reference value
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- Step 4: Partial reads succeed, no errors
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- Step 5: Random access works correctly
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## Verification Method
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- Verify data integrity via checksum
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- Confirm partial/random reads decompress correctly
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- Test memory usage during decompression reasonable
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- Verify no memory leaks or buffer overflows
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## Cleanup
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```
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umount /mnt/test
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mdconfig -d -u "${unit#md}"
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rm /tmp/chunk1 /tmp/chunk2
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```
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## Notes
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- Large file decompression tests pcluster handling
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- LZ4 decompression should be streaming (low memory)
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- Related tests: TC089 (pcluster mapping)
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