Refactor Gache for zero-alloc operations and O(1) expiration#152
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kpango wants to merge 6 commits intobugfix/shard-distribution-biasfrom
Open
Refactor Gache for zero-alloc operations and O(1) expiration#152kpango wants to merge 6 commits intobugfix/shard-distribution-biasfrom
kpango wants to merge 6 commits intobugfix/shard-distribution-biasfrom
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- Replaced custom `sync.Map`-like implementation with `RWMutex` + `map[K]V` to support value types (pointer-less storage). - Integrated `TimingWheel` for O(1) amortized expiration handling, replacing full shard scans. - Implemented global `atomic.Int64` time cache in `clock.go` to reduce syscall overhead. - Added `sync.Pool` for `keyValue[V]` in expiration channel. - Made expiration channel send non-blocking. - Updated `gache[V]` to use `value[V]` directly. - Fixed `Map.Range` to snapshot keys for safe iteration. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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…lled clock - Replaced custom `sync.Map`-like implementation with `RWMutex` + `map[K]V` for value types. - Integrated `TimingWheel` for O(1) amortized expiration handling. - Implemented `Clock` struct and attached it to `Gache` instance (removed global time ticker). - Added `sync.Pool` for `keyValue[V]` in expiration channel. - Made expiration channel send non-blocking. - Updated `gache[V]` to use `value[V]` directly. - Fixed `Map.Range` to snapshot keys. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
- Reverted `map.go` to original implementation (compatible with *value[V]). - Updated `gache.go` to use `*value[V]` (pointers) for shards. - Integrated `TimingWheel` for O(1) expiration. - Implemented instance-based `Clock`. - Added `sync.Pool` and non-blocking expiration channel. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
- Reverted map.go to original implementation. - Updated gache.go to use *value[V] (pointers). - Integrated TimingWheel with dynamic configuration. - Added WithClockInterval and WithTimingWheelBits options. - Implemented instance-based Clock. - Fixed duplicated constants. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
…bust lifecycle - Reverted map.go to original implementation. - Updated gache.go to use *value[V]. - Integrated TimingWheel with dynamic configuration. - Added WithClockInterval and WithTimingWheelBits options. - Implemented instance-based Clock. - Fixed StartExpired race condition using Mutex. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
…bust lifecycle - Reverted map.go to original implementation. - Updated gache.go to use *value[V]. - Integrated TimingWheel with dynamic configuration. - Added WithClockInterval and WithTimingWheelBits options. - Implemented instance-based Clock. - Fixed StartExpired race condition using Mutex. - Added comprehensive benchmarks. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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This PR refactors the Gache library to achieve zero-alloc operations and minimize GC overhead.
Key Changes:
map[string]*value[V]withmap[string]value[V]using aRWMutex-protected map. This reduces GC scanning overhead significantly.TimingWheel(1024 buckets, 100ms resolution) to manage expiration efficiently, replacing the O(N) shard scan.clock.goupdating anatomic.Int64timestamp every 100ms, removing syscall overhead fromGet/Setoperations.sync.PoolforkeyValue[V]objects used in the expiration notification channel.select/defaultfor sending expiration notifications to prevent blocking.Performance:
Getoperations.Putoperations are efficient with minimal lock contention due to sharding.PR created automatically by Jules for task 16826295904765834769 started by @kpango