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CompressionStats

featherdb_storage::compression

Struct CompressionStats 

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pub struct CompressionStats {
    pub bytes_before_compression: AtomicU64,
    pub bytes_after_compression: AtomicU64,
    pub pages_compressed: AtomicU64,
    pub pages_skipped: AtomicU64,
    pub pages_decompressed: AtomicU64,
}
Expand description

Statistics for compression operations

Fields§

§bytes_before_compression: AtomicU64

Total bytes before compression

§bytes_after_compression: AtomicU64

Total bytes after compression

§pages_compressed: AtomicU64

Number of pages compressed

§pages_skipped: AtomicU64

Number of pages skipped (below threshold or incompressible)

§pages_decompressed: AtomicU64

Number of pages decompressed

Implementations§

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impl CompressionStats

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pub fn new() -> Self

Create new compression stats

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pub fn compression_ratio(&self) -> f64

Get the overall compression ratio (0.0-1.0, lower is better) Returns 1.0 if no compression has occurred

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pub fn space_savings_percent(&self) -> f64

Get the space savings percentage (0-100%, higher is better)

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pub fn snapshot(&self) -> CompressionStatsSnapshot

Get a snapshot of current statistics

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pub fn record_compression(&self, original_size: usize, compressed_size: usize)

Record a compression operation

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pub fn record_skipped(&self, size: usize)

Record a skipped page (not compressed)

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pub fn record_decompression(&self)

Record a decompression operation

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pub fn reset(&self)

Reset all statistics

Trait Implementations§

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impl Clone for CompressionStats

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CompressionStats

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for CompressionStats

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fn default() -> CompressionStats

Returns the “default value” for a type. Read more

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