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Operating Systems AIX AIX 6.1: Releasing Memory and Page Space Post 302490951 by Haichao on Wednesday 26th of January 2011 09:17:25 AM
Old 01-26-2011
AIX 6.1: Releasing Memory and Page Space

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:
Code:
     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

Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks.

Last edited by zaxxon; 01-26-2011 at 11:01 AM.. Reason: code tags
 

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