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请教:为什么oracle在AIX有空闲内存的情况下使用SWAP?
root@qddb2:/#topas
MEMORY
PAGING Real,MB 127743
Faults 37970 % Comp 68
Steals 5955 % Noncomp 4
PgspIn 0 % Client 4
PgspOut 0
PageIn 8509 PAGING SPACE
PageOut 7913 Size,MB 20480
Sios 16391 % Used 42
% Free 58
root@qddb2:/#svmon -G
size inuse free pin virtual mmode
memory 32702448 23846870 8855578 7957381 24453829 Ded
pg space 5242880 2181434
work pers clnt other
pin 6977338 0 37211 942832
in use 22205531 0 1641339
PageSize PoolSize inuse pgsp pin virtual
s 4 KB - 4035318 2181434 1524677 4642277
m 64 KB - 1238222 0 402044 1238222
root@qddb2:/#prtconf -m
Memory Size: 127744 MB
root@qddb2:/#vmo -a
ame_cpus_per_pool = n/a
ame_maxfree_mem = n/a
ame_min_ucpool_size = n/a
ame_minfree_mem = n/a
ams_loan_policy = n/a
enhanced_affinity_affin_time = 1
enhanced_affinity_vmpool_limit = 10
esid_allocator = 0
force_relalias_lite = 0
kernel_heap_psize = 65536
lgpg_regions = 0
lgpg_size = 0
low_ps_handling = 1
maxfree = 1088
maxperm = 3174703 maxperm为10%
maxpin = 26350535
maxpin% = 80
memory_frames = 32702448
memplace_data = 0
memplace_mapped_file = 0
memplace_shm_anonymous = 0
memplace_shm_named = 0
memplace_stack = 0
memplace_text = 0
memplace_unmapped_file = 0
minfree = 960
minperm = 1587349
minperm% = 5
nokilluid = 0
npskill = 40960
npswarn = 163840
num_locks_per_semid = 1
numpsblks = 5242880
pinnable_frames = 24744326
relalias_percentage = 0
scrub = 0
v_pinshm = 0
vmm_default_pspa = 0
vmm_klock_mode = 1
wlm_memlimit_nonpg = 1
root@qddb2:/#vmstat 1 6
System configuration: lcpu=64 mem=127743MB
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
5 4 24423874 8885766 0 0 2 5902 7860 0 13797 68834 68705 7 14 72 7
8 0 24427136 8882536 0 0 0 7418 8602 0 14937 75115 74611 8 15 70 7
6 1 24426568 8882896 0 0 0 6708 7294 0 14068 88620 66698 8 16 69 7
6 2 24429043 8880526 0 0 3 7446 10297 0 15939 71412 90144 7 13 73 7
5 2 24427132 8882575 0 0 0 12943 15599 0 18729 75637 109878 7 14 72 8
6 2 24427634 8882074 0 0 2 9351 13053 0 18752 82426 94630 13 13 67 7
root@qddb2:/#lsps -a
Page Space Physical Volume Volume Group Size %Used Active Auto Type Chksum
hd6 hdisk1 rootvg 20480MB 42 yes yes lv 0
maxperm% =10
maxpin% = 80
通过svmon可以看出有 8855578(4k)物理内存空闲,为什么 topas中PAGING SPACE的Used为42 % ,还有大量的PageIn和PageOut呢?
请大神指教。
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