Interesting swap usage Post: 302811203

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Operating Systems Solaris Interesting swap usage Post 302811203 by gregsih on Thursday 23rd of May 2013 09:08:03 AM

05-23-2013

Registered User

Interesting swap usage

From the server showing the issue:

Code:

 
# swap -s
total: 10964072k bytes allocated + 185592k reserved = 11149664k used, 38735512k available
 
# swap -l
swapfile             dev  swaplo blocks   free
/dev/zvol/dsk/rpool/swap 256,1      16 16777200 16777200
 
# vmstat 2 2
 kthr      memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr s4 s5 s6 s7   in   sy   cs us sy id
 0 0 0 81782944 96140160 21 82 0 0 0  0  3 -0  1 -0  1 1588  664 1387  0  0 100
 0 0 0 38734832 53113984 1 11 0 0  0  0  0  0  0  0  0 1936 1629 2075  0  0 100
 
 # prstat -Z -n 1,10 1 1
   PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
  1822 oracle   6087M 6079M sleep   59    0   0:13:22 0.0% oracle/1
ZONEID    NPROC  SWAP   RSS MEMORY      TIME  CPU ZONE
     0      128   11G   11G   8.4%   0:34:03 0.0% global
 
 
 
 
Total: 128 processes, 3333 lwps, load averages: 0.04, 0.05, 0.04
 
 
# echo "::memstat" | mdb -k
Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     319203              2493    2%
ZFS File Data             8056420             62940   49%
Anon                      1372651             10723    8%
Exec and libs               26078               203    0%
Page cache                  13682               106    0%
Free (cachelist)             9417                73    0%
Free (freelist)           6627062             51773   40%
Total                    16424513            128316
Physical                 16410049            128203
 
#df -h -n swap
Filesystem             size   used  avail capacity  Mounted on
swap                    37G    40K    37G     1%    /var/run

From the second server

Code:

 
# swap -s
total: 3501648k bytes allocated + 283192k reserved = 3784840k used, 9495632k available
 
# swap -l
swapfile             dev  swaplo blocks   free
/dev/zvol/dsk/rpool/swap 256,1      16 16777200 16777200
 
# vmstat 2 2
 kthr      memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr s4 s5 s6 s7   in   sy   cs us sy id
 0 0 0 16223304 24564312 17 77 0 0 0  0  0 -2  3 -4  3 2322 1816 2135  0  0 100
 0 0 0 9494752 17840096 99 204 0 0 0  0  0  0  0  0  0 2356 2744 2699  0  0 100
 
# prstat -Z -n 1,10 1 1
   PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
  9613 oracle    891M  876M sleep   59    0   0:50:30 0.2% oracle/1
ZONEID    NPROC  SWAP   RSS MEMORY      TIME  CPU ZONE
     0      148 3652M 3684M   2.8%   7:01:36 0.2% global
 
 
 
 
Total: 148 processes, 3433 lwps, load averages: 0.18, 0.18, 0.18
 
# echo "::memstat" | mdb -k
Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     743484              5808    5%
ZFS File Data            12976767            101380   79%
Anon                       440277              3439    3%
Exec and libs               22564               176    0%
Page cache                  14489               113    0%
Free (cachelist)            14968               116    0%
Free (freelist)           2211964             17280   13%
Total                    16424513            128316
Physical                 16410051            128203
 
# df -hn swap
Filesystem             size   used  avail capacity  Mounted on
swap                   9.1G    56K   9.1G     1%    /var/run

Both servers were showing the second set of output prior to Sunday last week.

Hope this helps

gregsih

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LEARN ABOUT HPUX

allocate_fs_swapmap

allocate_fs_swapmap(5)						File Formats Manual					    allocate_fs_swapmap(5)

NAME

       allocate_fs_swapmap - determines when swapmap structures are allocated for filesystem swap

VALUES

   Failsafe
   Default
   Allowed values
       or

DESCRIPTION

       The tunable is used to determine whether to allocate all needed filesystem swap structures during the initialization of the filesystem swap
       device or wait until they are needed.  Pre-allocation of all filesystem swap structures upon initialization saves time during  later  usage
       of the filesystem swap, and prevents later allocation failure due to physical memory contention.

       Dynamic allocation decreases the memory footprint of the filesystem swap system.

   Who is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       Systems under heavy memory load may not be able to acquire enough memory to hold the swap mapping structures for an addition of file system
       swap.  These calls to add swap would fail with the error though presumably they would be retried.  Frequent failure  on	file  system  swap
       addition with would merit enabling this tunable.

   What Are the Side Effects of Raising the Value?
       All  the  swap  map structures for each file system swap device would be preallocated during swap initialization at kernel boot, increasing
       the memory footprint of the kernel.  The amount of increase depends on the number and size of file system swap devices.

   When Should the Value of This Tunable Be Lowered?
       Systems with limited memory available to the kernel that also have limited use of file system swap devices should disable this  tunable	to
       decrease kernel memory usage.

   What Are the Side Effects of Lowering the Value?
       File system swap additions may fail with when memory contention is high.

   What Other Tunable Values Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters					    allocate_fs_swapmap(5)

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