Hello list.
I have a server not performing well - openldap shows high cpu usage and
iowait of server is high
db_stat -h /var/lib/ldap -c
555 Last allocated locker ID
0x7fffffff Current maximum unused locker ID
9 Number of lock modes
1000 Maximum number of locks possible
1000 Maximum number of lockers possible
1000 Maximum number of lock objects possible
40 Number of lock object partitions
10 Number of current locks
645 Maximum number of locks at any one time
18 Maximum number of locks in any one bucket
0 Maximum number of locks stolen by for an empty partition
0 Maximum number of locks stolen for any one partition
141 Number of current lockers
152 Maximum number of lockers at any one time
10 Number of current lock objects
623 Maximum number of lock objects at any one time
6 Maximum number of lock objects in any one bucket
0 Maximum number of objects stolen by for an empty partition
0 Maximum number of objects stolen for any one partition
1237M Total number of locks requested (1237918767)
1237M Total number of locks released (1237917421)
0 Total number of locks upgraded
103 Total number of locks downgraded
492M Lock requests not available due to conflicts, for which we
waited (492996269)
1336 Lock requests not available due to conflicts, for which we did
not wait
0 Number of deadlocks
0 Lock timeout value
0 Number of locks that have timed out
0 Transaction timeout value
0 Number of transactions that have timed out
736KB The size of the lock region
3685M The number of partition locks that required waiting (135%)
3665M The maximum number of times any partition lock was waited for (108%)
19810 The number of object queue operations that required waiting (0%)
2443M The number of locker allocations that required waiting (58%)
0 The number of region locks that required waiting (0%)
6 Maximum hash bucket length
Are the lines in red really correct or just side effects ? How do I go
about it ? I can have anything else? Increase cache? How?
db_stat -h /var/lib/ldap -m
12MB 514KB 24B Total cache size
1 Number of caches
1 Maximum number of caches
12MB 520KB Pool individual cache size
0 Maximum memory-mapped file size
0 Maximum open file descriptors
0 Maximum sequential buffer writes
0 Sleep after writing maximum sequential buffers
0 Requested pages mapped into the process' address space
788M Requested pages found in the cache (21%)
2867M Requested pages not found in the cache (2867396236)
740 Pages created in the cache
2863M Pages read into the cache (2863007508)
228732 Pages written from the cache to the backing file
2865M Clean pages forced from the cache (2865409816)
206860 Dirty pages forced from the cache
0 Dirty pages written by trickle-sync thread
681 Current total page count
681 Current clean page count
0 Current dirty page count
2053 Number of hash buckets used for page location
1567M Total number of times hash chains searched for a page (1567726752)
6 The longest hash chain searched for a page
597M Total number of hash chain entries checked for page (597110368)
2479M The number of hash bucket locks that required waiting (61%)
2211M The maximum number of times any hash bucket lock was waited for
(771%)
73M The number of region locks that required waiting (4%)
0 The number of buffers frozen
0 The number of buffers thawed
0 The number of frozen buffers freed
2867M The number of page allocations (2867487657)
2436M The number of hash buckets examined during allocations (2436374360)
4110 The maximum number of hash buckets examined for an allocation
2867M The number of pages examined during allocations (2867478740)
17 The max number of pages examined for an allocation
76217 Threads waited on page I/O
Thanks very Much.
--
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