Hi everyone,
i have a question about the Memory Management in AIX 6.1.
I have
- 128 GB RAM and
- 70 GB Page Space.
The application i am running on this machine is doing some operations in perl. These are done only once a day and uses both memory and paging space. My problem now is that when the application is finished with its operations the memory and page space are not released but hold. And this means ofr the next time that i will get a memory and page space overflow. I heard something about AIX 6.1 having a feature that does not allow the memory to be freed in order to do a faster processing for the next time. Someone told me about the parameters maxperm and minperm and that these values control this feature.
Anyone has some suggestions which values i should use?
this is the vmo -a output:
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
force_relalias_lite = 0
kernel_heap_psize = 65536
lgpg_regions = 0
lgpg_size = 0
low_ps_handling = 1
maxfree = 1088
maxperm = 29293578
maxpin = 27041196
maxpin% = 80
memory_frames = 33554432
memplace_data = 2
memplace_mapped_file = 2
memplace_shm_anonymous = 2
memplace_shm_named = 2
memplace_stack = 2
memplace_text = 2
memplace_unmapped_file = 2
minfree = 960
minperm = 976450
minperm% = 3
nokilluid = 0
npskill = 138240
npswarn = 552960
numpsblks = 17694720
pinnable_frames = 31259644
relalias_percentage = 0
scrub = 0
v_pinshm = 0
vmm_default_pspa = 0
wlm_memlimit_nonpg = 1
and this is the vmostat -v output:
33554432 memory pages
32548422 lruable pages
30013582 free pages
7 memory pools
2295313 pinned pages
80.0 maxpin percentage
3.0 minperm percentage
90.0 maxperm percentage
1.6 numperm percentage
529395 file pages
0.0 compressed percentage
0 compressed pages
1.6 numclient percentage
90.0 maxclient percentage
529395 client pages
0 remote pageouts scheduled
1 pending disk I/Os blocked with no pbuf
4761910 paging space I/Os blocked with no psbuf
2484 filesystem I/Os blocked with no fsbuf
11444 client filesystem I/Os blocked with no fsbuf
312559 external pager filesystem I/Os blocked with no fsbuf
Best,
Haichao