Грязный кеш Mongodb больше чем используемый кеш - PullRequest
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Грязный кеш Mongodb больше чем используемый кеш

0 голосов
/ 13 января 2020

Мы сталкиваемся с проблемой mongodb, когда процессор всегда равен 100%, а использование памяти также постепенно достигает 100%.

Анализируя статистику коллекции, мы обнаружили, что кэширование сильно загрязнено. кеш. 

 "cache" : {
            "bytes currently in the cache" : 2138193726.0,
            "bytes dirty in the cache cumulative" : 26878586216.0,
            "bytes read into cache" : 2684641105.0,
            "bytes written from cache" : 9250929218.0,
            "checkpoint blocked page eviction" : 0,
            "data source pages selected for eviction unable to be evicted" : 1,
            "eviction walk passes of a file" : 1373,
            "eviction walk target pages histogram - 0-9" : 24,
            "eviction walk target pages histogram - 10-31" : 117,
            "eviction walk target pages histogram - 128 and higher" : 0,
            "eviction walk target pages histogram - 32-63" : 1084,
            "eviction walk target pages histogram - 64-128" : 148,
            "eviction walks abandoned" : 636,
            "eviction walks gave up because they restarted their walk twice" : 0,
            "eviction walks gave up because they saw too many pages and found no candidates" : 3,
            "eviction walks gave up because they saw too many pages and found too few candidates" : 2,
            "eviction walks reached end of tree" : 236,
            "eviction walks started from root of tree" : 641,
            "eviction walks started from saved location in tree" : 732,
            "hazard pointer blocked page eviction" : 1,
            "in-memory page passed criteria to be split" : 0,
            "in-memory page splits" : 0,
            "internal pages evicted" : 1,
            "internal pages split during eviction" : 0,
            "leaf pages split during eviction" : 7,
            "modified pages evicted" : 9826,
            "overflow pages read into cache" : 0,
            "page split during eviction deepened the tree" : 0,
            "page written requiring cache overflow records" : 0,
            "pages read into cache" : 121604,
            "pages read into cache after truncate" : 0,
            "pages read into cache after truncate in prepare state" : 0,
            "pages read into cache requiring cache overflow entries" : 0,
            "pages requested from the cache" : 380045669,
            "pages seen by eviction walk" : 101851,
            "pages written from cache" : 559839,
            "pages written requiring in-memory restoration" : 0,
            "tracked dirty bytes in the cache" : 47012214,
            "unmodified pages evicted" : 36225
        },

Это вызывает проблемы с памятью в mongodb и каковы возможные пути улучшения управления памятью в db

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