Heavy swap

From: paulose kutty (paulosekutty_at_hotmail.com)
Date: 07/31/03

  • Next message: Preiszl Matthias: "Summary: 10/100 Mbit Network Card" 
    To: sunmanagers@sunmanagers.org
Date: Thu, 31 Jul 2003 09:17:50 +0000

    Hi all,
            We have two 4800 servers (8 CPU , 12 GB RAM ). One server is running Oracle
    and other server is running application. It is observed that the memory
    utilization of application server is very high. We have given 15 GB swap on
    both the servers. Vmstat shows 5.5 Gb free memory and at the same time it is
    showing only 3GB is free in swap. Why the system is using swap heavily even
    though it has enough free memory . We have not done any system / kernel
    level tuning and all kernel parameters are set as default. Moreover some
    times the swap gets filled and the server stats showing an error message [ID
    470503 kern.warning] WARNING: Sorry, no swap space to grow stack for pid 949
    3 (mrbx4004). During this time also the free memory will be around 3 GB. How
    can I allocate all RAM to users keeping minimum for system / kernel
    processes or what is the solution? Any OS level tuning is required?

    Please find the output of vmstat.

    procs memory page disk faults cpu
    r b w swap free re mf pi po fr de sr s0 s1 s6 sd in sy cs us sy
    id
    0 0 0 16349624 10103088 602 2470 170 0 0 0 0 3 3 0 17 4063 4935 4338 7 5
    88
    0 0 0 3263688 5515168 543 3494 0 0 0 0 0 1 1 0 15 5665 18727 13939 25 18
    56
    3 1 0 3275640 5504240 2874 12077 112 0 0 0 0 35 40 0 60 10108 13611 15901 38
    22 40
    1 0 0 3250360 5503144 850 6302 32 0 0 0 0 17 12 0 25 7054 13783 14293 29 14
    56
    1 1 0 3227824 5490688 2192 9893 3240 0 0 0 0 0 0 0 273 8131 10811 13356 25
    14 60
    0 0 0 3253232 5489216 1483 6026 6616 0 0 0 0 0 0 0 142 6930 8898 12407 25 12
    63
    2 0 0 3255704 5498016 1770 10330 624 8 8 0 0 1 1 0 73 10966 17265 18212 42
    21 37
    0 0 0 3272696 5498000 86 1126 8 0 0 0 0 0 0 0 9 4815 11947 11430 29 12
    59
    1 0 0 3307896 5511160 648 2919 32 0 0 0 0 0 0 0 27 6324 9547 11164 28 9
    63
    0 0 0 3322152 5518496 2665 9794 136 0 0 0 0 0 0 0 42 8914 13445 15063 32 16
    52

    Thanks you

    Regards
    Paulosekutty

    _________________________________________________________________
    They are beautiful. They are in danger.
    http://server1.msn.co.in/Slideshow/BeautyoftheBeast/index.asp Our
    four-legged friends.
    _______________________________________________
    sunmanagers mailing list
    sunmanagers@sunmanagers.org
    http://www.sunmanagers.org/mailman/listinfo/sunmanagers

  • Next message: Preiszl Matthias: "Summary: 10/100 Mbit Network Card"

    Relevant Pages

    • Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]
      ... memory freed it so there is free memory that could be filled with data ... in some other situations swap prefetch cannot help becouse useless data is getting cached at the expense of useful data. ... the design is to use CPU and I/O capacity that's otherwise idle to fill free memory with data from swap. ... Upon completion, it actually frees enough memory that swap-prefetch _could_ help on some boxes, while the real issue is that they should first and foremost dump GNU locate. ...
      (Linux-Kernel)
    • Re: db performance
      ... remote site since we added more memory to the db server. ... Queues on a gateway of the same network as the db server working fine, ... it suggests the SWAP should be double RAM. ...
      (freebsd-questions)
    • Oracle performance and swapping on Tru 64
      ... resource upgrading it) on a Compaq Tru 64 server. ... do with a memory upgrade. ... Swap partition /dev/re0b: ... Allocated space: 500000 pages ...
      (comp.databases.oracle.server)
    • Re: Lots of EventID 2020s and not enough Kernel Memory?
      ... being a swap of hardware. ... I have been monitoring the memory using ... Netgear Print Servers, HP Print servers on print queues on the server. ...
      (microsoft.public.win2000.general)
    • Re: memory
      ... Andrew - you won't see free memory on an SBS because Exchange Server ...
      (microsoft.public.windows.server.sbs)