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Full Discussion: AIX 6.1 memory tuning
Operating Systems AIX AIX 6.1 memory tuning Post 302887197 by dzodzo on Thursday 6th of February 2014 09:43:29 AM
Old 02-06-2014
vmstat -v shows that about 20% of memory pages are pinned (that would roughly correspond to those 13 GB for kernel). Does it mean that application doesn't use memory pinning (server is running Oracle+SAP)? svmon tells me that oracle and workprocesses use about 33 MB of pinned memory, perhaps it's the way they are designed. I'll have to check on some testing system what happens, if you continually increase memory for aplication, how it will affect OS behaviour.

Code:
             16842752 memory pages
             16281136 lruable pages
              2796643 free pages
                    5 memory pools
              3415001 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                 13.8 numperm percentage
              2258042 file pages
                  0.0 compressed percentage
                    0 compressed pages
                 13.8 numclient percentage
                 90.0 maxclient percentage
              2258042 client pages
                    0 remote pageouts scheduled
                  237 pending disk I/Os blocked with no pbuf
                    0 paging space I/Os blocked with no psbuf
                 2228 filesystem I/Os blocked with no fsbuf
                    0 client filesystem I/Os blocked with no fsbuf
                22230 external pager filesystem I/Os blocked with no fsbuf
                 70.0 percentage of memory used for computational pages

 

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acctsuspend(5)							File Formats Manual						    acctsuspend(5)

NAME
acctsuspend, acctresume - suspend and resume accounting when available disk space reaches threshold VALUES
Failsafe Default. Default acctsuspend: acctresume: Allowed values acctresume: acctsuspend: Recommended values acctsuspend: acctresume: (But more than acctsuspend) DESCRIPTION
The and tunables control when accounting stops and resumes due to disk space constraints. When free disk space on the file system being used by accounting reaches the suspension threshold, which is the percentage relative to the percentage of disk space available only to the superuser, accounting is suspended until such time as the free disk space reaches the resumption threshold, which is the percentage rela- tive to the percentage of disk space available only to the superuser. Note: Since the and values are specified relative to the percentage of disk space available only to the superuser, negative values of these parameters can make sense. For example, if the superuser has reserved 10 percent of the disk space on the file system at file system creation time, and acctsuspend is -5 and acctresume is 0, the suspension threshold will be 5 percent of the total disk space and the resumption threshold will be 10 percent of the total disk space. Who Is Expected to Change This Tunable? Anyone using accounting. Restrictions on Changing Changes to this tunable take effect at the next reboot. When Should the Value of This Tunable Be Raised? Increasing either variable should be considered when it is necessary to maintain a higher percentage of free space on the accounting filesystem. What Are the Side Effects of Raising the Value of This Tunable? The higher either value is, the less accounting data may be captured. The further the values are separated, the greater the amount of potentially lost accounting data. When Should the Value of This Tunable Be Lowered? If additional disk space is needed for accounting data, and it cannot be obtained by moving files off of the filesystem, then the value of should be lowered. What Are the Side Effects of Lowering the Value of This Tunable? Filesystem performance (writing accounting records) decreases as the filesystem fills up. In turn, this will decrease the overall perfor- mance of accounting processes. What Other Tunables Should Be Changed at the Same Time? When changing either of these tunables, both should be considered. 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
and were developed by HP. SEE ALSO
accton(1M). Tunable Kernel Parameters acctsuspend(5)
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