Memory so high, and when clean not reduce size about bigcache

[janisz]

Could you share your configuration. Bigcache does not free once allocated memory to system.

[teng231]

func getConfig(config *BigCacheConfig) bigcache.Config {
	return bigcache.Config{
		// number of shards (must be a power of 2)
		Shards: 16,

		// time after which entry can be evicted
		LifeWindow: 10 * time.Hour, // 5 * time.Minute,

		// Interval between removing expired entries (clean up).
		// If set to <= 0 then no action is performed.
		// Setting to < 1 second is counterproductive — bigcache has a one second resolution.
		CleanWindow: 5 * time.Minute,

		// rps * lifeWindow, used only in initial memory allocation
		MaxEntriesInWindow: 1000 * 10 * 60,

		// max entry size in bytes, used only in initial memory allocation
		MaxEntrySize: 100,

		// prints information about additional memory allocation
		Verbose: false,

		// cache will not allocate more memory than this limit, value in MB
		// if value is reached then the oldest entries can be overridden for the new ones
		// 0 value means no size limit
		HardMaxCacheSize: 500,

		// callback fired when the oldest entry is removed because of its expiration time or no space left
		// for the new entry, or because delete was called. A bitmask representing the reason will be returned.
		// Default value is nil which means no callback and it prevents from unwrapping the oldest entry.
		OnRemove: nil,

		// OnRemoveWithReason is a callback fired when the oldest entry is removed because of its expiration time or no space left
		// for the new entry, or because delete was called. A constant representing the reason will be passed through.
		// Default value is nil which means no callback and it prevents from unwrapping the oldest entry.
		// Ignored if OnRemove is specified.
		OnRemoveWithReason: nil,
	}
}

[janisz]

so in your example cache uses 400MB while max size it's 500MB. I think it's correct behavior.

[teng231]

so in your example cache uses 400MB while max size it's 500MB. I think it's correct behavior.

mem start with 90mb my data limit 2000 items
but after 10 days increase 1gb

i setup limit resource on k8s pod will be restarted when memory equal 1GB. if not limit maybe can increase more

[janisz]

Go 1.19 introduced GOMEMLIMIT maybe it's worth to use it. Although bigcache should not consume more memory then HardMaxCacheSize there is still some room for underlying map and a chance that Go does not release once allocated memory.