hujirong
asked on
Cache hit rate and performance
Hi
Take the following data for example, basically:
1. Is it good if cache hit rate is high? How high should be normally?
2. Miss rate is high means the cache size is not big enough, right?
Jirong
mvfsstat -c
----------------- Wed Nov 1 11:37:55 2006 ---------------------
dnlc: 7342936 7260055( 98.9%) hit 54331 dot 6364243 dir 746652 reg 94829 noent
82881 ( 1.1%) miss 15113 events
114575( 1.6%) add 18633 dir 64784 reg 31158 noent
attr: 8693955 8598294( 98.9%) hit 183 lvut
95661( 1.1%) miss (53565cto+0gen+102timo+415
329505 updates 51269unexp+32108exp mod, 3817 vmod
rddir: 64770 54001( 83.4%) hit 10769 miss
Take the following data for example, basically:
1. Is it good if cache hit rate is high? How high should be normally?
2. Miss rate is high means the cache size is not big enough, right?
Jirong
mvfsstat -c
----------------- Wed Nov 1 11:37:55 2006 ---------------------
dnlc: 7342936 7260055( 98.9%) hit 54331 dot 6364243 dir 746652 reg 94829 noent
82881 ( 1.1%) miss 15113 events
114575( 1.6%) add 18633 dir 64784 reg 31158 noent
attr: 8693955 8598294( 98.9%) hit 183 lvut
95661( 1.1%) miss (53565cto+0gen+102timo+415
329505 updates 51269unexp+32108exp mod, 3817 vmod
rddir: 64770 54001( 83.4%) hit 10769 miss
sjm_ee
You are starting from the wrong point. What is the problem that the user is experiencing? If none then stop.
ASKER
Thank you. I guess you mean nothing is wrong with that cache setting.
Jirong
Jirong
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ASKER
Thank you very much. It's very well explained.
Jirong
Jirong