Performance problems

From: Natesa Sabapathy <nssaba_at_mailandnews.com>
Date: Wed, 20 Jun 2001 16:42:16 -0400

Hi Admins,

The OS Version is 4.0D with patch kit 2. I am getting the following after the sys-check output.
I would like to know which parameter to set in the vm subsystem right to reduce
the page-in activitiy.

Are there any good web documentation on this stuff ? I had been browsing a lot and could not find
something useful.

TIA,
Natesa.

OUTPUT OF SYS_CHECK

Operational: High free memory ( 1474200 KB ).
This may be caused by the system being idle or system parameters incorrectly set.

Operational: There is excessive page-in activity on the system ( 4558 ).
Investigate this condition.
See vmstat(1) reference page for information.

Note: The top and syd system monitoring tools, which are available in the public domain or on the DIGITAL UNIX Freeware CD-ROM, may consume enough kernel memory to crash the system if they are being run continuously. Do not run these tools continuously, unless you apply patches to these tools that fix the problem.

---

Total memory = 2097152 KB ( 2048 MB ) ( 2058 MB )
Kernel size, console and gh-chunks = 47800 KB ( 46 MB )
gh-chunks = 0 ( 0 KB ) ( 0 MB )
Total vm managed memory after boot = 2049352 KB ( 2001 MB )
current ubc size = 278712 KB ( 272 MB ) ( 13 % )
current wired memory = 161416 KB ( 157 MB ) ( 7 % )
current vm memory = 1620288 KB ( 1582 MB ) ( 79 % )

vm-page-free-target = 512 ( 4096 KB )
vm-page-free-optimal = 266 ( 2128 KB )
vm-page-free-min = 20 ( 160 KB )
vm-page-free-reserved = 10 ( 80 KB )

ubc-maxpercent = 100 % ( 2049352 KB ) ( 2001 MB )
ubc-minpercent = 10 % ( 204935 KB ) ( 200 MB )
ubc-borrowpercent = 20 % ( 409870 KB ) ( 400 MB )
vm-ubcdirtypercent = 10 % ( 27871 KB ) ( 27 MB )
vm-ubcseqstartpercent = 30 % ( 614805 KB ) ( 600 MB )
vm-ubcseqpercent = 10 % of current UBC size, when UBC size is greater than vm-ubcseqstartpercent ( 61480 KB ) ( 60 MB )

The namei cache hit rate is 98 %.

The UBC cache hit rate is 28 %.

vmstat -P

Total Physical Memory =  2048.00 M
                      =   262144 pages


Physical Memory Clusters:

 start_pfn     end_pfn        type  size_pages / size_bytes
         0         256         pal         256 /    2.00M
       256      262139          os      261883 / 2045.96M
    262139      262144         pal           5 /   40.00k

Physical Memory Use:

 start_pfn     end_pfn        type  size_pages / size_bytes
       256         280   unixtable          24 /  192.00k
       280         284    scavenge           4 /   32.00k
       284         814        text         530 /    4.14M
       814         918        data         104 /  832.00k
       918        1134         bss         216 /    1.69M
      1134        1287      kdebug         153 /    1.20M
      1287        1294     cfgmgmt           7 /   56.00k
      1294        1295       locks           1 /    8.00k
      1295        1825   unixtable         530 /    4.14M
      1825        1838        pmap          13 /  104.00k
      1838        5970    vmtables        4132 /   32.28M
      5970      262139     managed      256169 / 2001.32M
                             ============================
         Total Physical Memory Use:     261883 / 2045.96M

Managed Pages Break Down:

       free pages = 185042
     active pages = 7650
   inactive pages = 9498
      wired pages = 21451
        ubc pages = 34294
        ==================
            Total = 257935

WIRED Pages Break Down:

   vm wired pages = 2381
  ubc wired pages = 5757
  meta data pages = 2618
     malloc pages = 7003
     contig pages = 584
    user ptepages = 3038
  kernel ptepages = 58
    free ptepages = 8
        ==================
            Total = 21447

vmstat -s

Virtual Memory Statistics: (pagesize = 8192)
      7590   active pages             
      9498   inactive pages           
    185096   free pages               
     21459   wired pages              
2053607840   virtual memory page faults
 652246754   copy-on-write page faults
 547530215   zero fill page faults    
     16352   reattaches from reclaim list
 649476446   pages paged in           
       751   pages paged out          
4497686305   task and thread context switches
 297946918   device interrupts        
24631656187   system calls             

vmstat -f

  34141060   forks                    
       250   vforks                   

vmstat 2 5

Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy  id
  3170 31   51K 185K  21K 2053M 652M 547M  16K 649M  751  88  7K  1K   5   9  86
  3172 31   52K 184K  21K 2815  408 1499    0  635    0 288 17K  2K   7  17  76
  3166 30   51K 184K  21K 1140  231  319    0  349    0 177  3K  2K   3   6  90
  4166 30   51K 185K  21K 1188  222  253    0  162    0 263 31K  3K  10  24  66
  3166 30   51K 185K  21K 3225  774  697    0  725    0 238 26K  4K  12  24  64

vmstat -f

  34141116   forks                    
       250   vforks                   

Received on Wed Jun 20 2001 - 20:23:35 NZST