What is the relationship between popularityWeights, popularityBuckets and htBucketPower

[xiedeyantu]

I know that htbucketpower is the number of buckets to the nth power of 2. Popularityweights and popularitybuckets play a role in the cachebench. Could you tell me more detail please？

[xiedeyantu]

by the way, can not valSize be greater than 4MB? I use configuration: "valSizeRange": [ 5242880,5242882 ] and "enableChainedItem": true to test navy, set : 16,156/s, success : 0.00%

[leozzx]

by the way, can not valSize be greater than 4MB? I use configuration: "valSizeRange": [ 5242880,5242882 ] and "enableChainedItem": true to test navy, set : 16,156/s, success : 0.00%

valSize can't be greater than 4MB, Cachebench doesn't automatically split the item into chained items. You should use "chainedItemValSizeRange" to specify chained item size.

[sathyaphoenix]

@xiedeyantu chained items stress test was implemented in cachebench much later. Like @leozzx pointed out, the chainedItemValSizeRange and chainedItemLengthRange and chainedItemLengthRangeProbability control how long the values are including the chain. We are missing documentation on this in https://cachelib.org/docs/Cache_Library_User_Guides/Configuring_cachebench_parameters

@leozzx we should document the chained item length parameters here in our next documentation sprint.