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| author | dormando <dormando@rydia.net> | 2017-06-24 01:07:03 -0700 |
|---|---|---|
| committer | dormando <dormando@rydia.net> | 2017-06-24 01:07:03 -0700 |
| commit | 1174994a6cb977785fdf38aea915d23c1cfb5a56 (patch) | |
| tree | a487bdea1b9eb1c96bcb65ee0e049330efefed39 /doc/new_lru.txt | |
| parent | b52da9e98add7cf6d72bb905acf003fea4b6d701 (diff) | |
| download | memcached-1174994a6cb977785fdf38aea915d23c1cfb5a56.tar.gz | |
hot_max_age is now hot_max_factor
defaults at 20% of COLD age.
hot_max_age was added because many people's caches were sitting at 32% memory
utilized (exactly the size of hot). Capping the LRU's by percentage and age
would promote some fairness, but I made a mistake making WARM dynamic but HOT
static. This is now fixed.
Diffstat (limited to 'doc/new_lru.txt')
| -rw-r--r-- | doc/new_lru.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/new_lru.txt b/doc/new_lru.txt index a944671..bf19233 100644 --- a/doc/new_lru.txt +++ b/doc/new_lru.txt @@ -14,8 +14,10 @@ Now, enabling `-o lru_maintainer` changes all of the behavior below: HOT, move to WARM, if active in WARM, stay in WARM. If active in COLD, move to WARM. The exception is that items active in COLD are immediately moved to WARM. - * HOT/WARM each capped at 32% of memory available for that slab class. COLD + * HOT/WARM each capped at N% of memory available for that slab class. COLD is uncapped (by default, as of this writing). + * HOT/WARM are also age capped by ratios of COLD's age. IE: HOT is capped at + N% of memory, or 10% of the age of COLD, whichever comes first. * Items flow from HOT/WARM into COLD. * A background thread exists which shuffles items between/within the LRU's as limits are reached. This includes moves from COLD to WARM. |