6.2.6. Monitoring of the Logical Memory
The paging activity of the hypervisor can be monitored in a shared memory LPAR. AIX provides a number of options for this. In this way, it is possible to monitor how much physical memory is currently allocated to the LPAR, how many pages have so far been paged-in again by the hypervisor and how much time delay has arisen as a result.
The “lparstat -m” command can be used to display shared memory statistics under AIX:
aix22 # lparstat -m 1
System configuration: lcpu=16 mem=2048MB mpsz=1.00GB iome=351.00MB iomp=11 ent=0.20
physb hpi hpit pmem iomin iomu iomf iohwm iomaf %entc vcsw
----- ----- ----- ----- ------ ------ ------ ------ ----- ----- -----
16.39 1 1 0.68 302.1 10.9 48.9 12.5 0 205.3 2708
0.27 0 0 0.68 302.1 10.9 48.9 12.5 0 12.5 609
0.22 0 0 0.68 302.1 10.9 48.9 12.5 0 7.4 581
9.80 96 30 0.68 302.1 10.9 48.9 12.5 0 100.4 1504
54.80 0 0 0.68 302.1 10.9 48.9 12.5 0 589.7 7024
81.46 1 1 0.68 302.1 10.9 48.9 12.5 0 907.1 11204
81.45 1 0 0.68 302.1 10.9 48.9 12.5 0 913.5 11236
79.88 0 0 0.68 302.1 10.9 48.9 12.5 0 911.6 10862
25.20 0 0 0.68 302.1 10.9 48.9 12.5 0 313.4 3839
0.20 0 0 0.68 302.1 10.9 48.9 12.5 0 6.8 426
^C
aix22 #
Among other things, the following attributes are displayed:
- mpsz – size of the shared memory pool
- hpi – number of hypervisor page-ins
- hpit – time consumed for the hypervisor page-ins in milliseconds
- pmem – allocated physical memory in GB
- …
Similar information can also be obtained with the vmstat command and the ‘-h‘ option, e.g.:
aix22 # vmstat -h -v
524288 memory pages
495111 lruable pages
2079 free pages
2 memory pools
206873 pinned pages
90.0 maxpin percentage
3.0 minperm percentage
90.0 maxperm percentage
3.0 numperm percentage
15311 file pages
0.0 compressed percentage
0 compressed pages
3.0 numclient percentage
90.0 maxclient percentage
15311 client pages
0 remote pageouts scheduled
0 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
47 client filesystem I/Os blocked with no fsbuf
0 external pager filesystem I/Os blocked with no fsbuf
11129 Virtualized Partition Memory Page Faults
6437 Time resolving virtualized partition memory page faults
278409 Number of 4k page frames loaned
53 Percentage of partition memory loaned
96.7 percentage of memory used for computational pages
aix22 #
The topas command has been expanded to include the ‘-L‘ option, to provide similar informations.