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rcapstat - report resource cap enforcement daemon statistics
rcapstat [-g] [-p | -z] [interval [count]]
The rcapstat command reports on the projects or zones capped by rcapd(1M). Each report contains statistics that pertain to the project or zone and paging statistics. Paging refers to the act of relocating portions of memory, called pages, to or from physical memory. rcapd pages out the most infrequently used pages.
The paging statistics in the first report issued show the activity since the daemon was started. Subsequent reports reflect the activity since the last report was issued.
Reports are issued every interval seconds up to the quantity specified by count, or forever if count is not specified.
The following options are supported:
-g
-p
-z
The following list defines the column headings in the rcapstat report and provides information about how to interpret the report.
id
project
zone
nproc
vm
rss
cap
at
Paging refers to the act of relocating portions of memory, called pages, to or from physical memory. rcapd pages out the most infrequently used pages.
avgat
pg
avgpg
The following operands are supported:
interval
count
Example 1 Using rcapstat to Report Cap and Project Information
Caps are defined for two projects associated with two users. user1 has a cap of 50 megabytes and user2 has a cap of 10 megabytes.
The following command produces five reports at 5-second sampling intervals.
example# rcapstat 5 5 id project nproc vm rss cap at avgat pg avgpg 112270 user1 24 123M 35M 50M 50M 0K 3312K 0K 78194 user2 1 2368K 1856K 10M 0K 0K 0K 0K id project nproc vm rss cap at avgat pg avgpg 112270 user1 24 123M 35M 50M 0K 0K 0K 0K 78194 user2 1 2368K 1856K 10M 0K 0K 0K 0K id project nproc vm rss cap at avgat pg avgpg 112270 user1 24 123M 35M 50M 0K 0K 0K 0K 78194 user2 1 2368K 1928K 10M 0K 0K 0K 0K id project nproc vm rss cap at avgat pg avgpg 112270 user1 24 123M 35M 50M 0K 0K 0K 0K 78194 user2 1 2368K 1928K 10M 0K 0K 0K 0K id project nproc vm rss cap at avgat pg avgpg 112270 user1 24 123M 35M 50M 0K 0K 0K 0K 78194 user2 1 2368K 1928K 10M 0K 0K 0K 0K
The first three lines of output constitute the first report, which contains the cap and project information for the two projects and paging statistics since rcapd was started. The at and pg columns are a number greater than zero for user1 and zero for user2, which indicates that at some time in the daemon's history, user1 exceeded its cap but user2 did not.
The subsequent reports show no significant activity.
Example 2 Using rcapstat to Monitor the RSS of a Project
example% rcapstat 5 5 id project nproc vm rss cap at avgat pg avgpg 376565 user1 57 209M 46M 10M 440M 220M 5528K 2764K 376565 user1 57 209M 44M 10M 394M 131M 4912K 1637K 376565 user1 56 207M 43M 10M 440M 147M 6048K 2016K 376565 user1 56 207M 42M 10M 522M 174M 4368K 1456K 376565 user1 56 207M 44M 10M 482M 161M 3376K 1125K
The project user1 has an RSS in excess of its physical memory cap. The nonzero values in the pg column indicate that rcapd is consistently paging out memory as it attempts to meet the cap by lowering the physical memory utilization of the project's processes. However, rcapd is unsuccessful, as indicated by the varying rss values that do not show a corresponding decrease. This means that the application's resident memory is being actively used, forcing rcapd to affect the working set. Under this condition, the system continues to experience high page fault rates, and associated I/O, until the working set size (WSS) is reduced, the cap is raised, or the application changes its memory access pattern. Notice that a page fault occurs when either a new page must be created, or the system must copy in a page from the swap device.
Example 3 Determining the Working Set Size of a Project
This example is a continuation of Example 1, and it uses the same project.
example% rcapstat 5 5 id project nproc vm rss cap at avgat pg avgpg 376565 user1 56 207M 44M 10M 381M 191M 15M 7924K 376565 user1 56 207M 46M 10M 479M 160M 2696K 898K 376565 user1 56 207M 46M 10M 424M 141M 7280K 2426K 376565 user1 56 207M 43M 10M 401M 201M 4808K 2404K 376565 user1 56 207M 43M 10M 456M 152M 4800K 1600K 376565 user1 56 207M 44M 10M 486M 162M 4064K 1354K 376565 user1 56 207M 52M 100M 191M 95M 1944K 972K 376565 user1 56 207M 55M 100M 0K 0K 0K 0K 376565 user1 56 207M 56M 100M 0K 0K 0K 0K 376565 user1 56 207M 56M 100M 0K 0K 0K 0K 376565 user1 56 207M 56M 100M 0K 0K 0K 0K 376565 user1 56 207M 56M 100M 0K 0K 0K 0K
By inhibiting cap enforcement, either by raising the cap of a project or by changing the minimum physical memory utilization for cap enforcement (see rcapadm(1M)), the resident set can become the working set. The rss column might stabilize to show the project WSS, as shown in the previous example. The WSS is the minimum cap value that allows the project's processes to operate without perpetually incurring page faults.
The following exit values are returned:
0
1
2
See attributes(5) for descriptions of the following attributes:
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rcapadm(1M), rcapd(1M), attributes(5)
Physical Memory Control Using the Resource Capping Daemon in System Administration Guide: Resource Management
If the interval specified to rcapstat is shorter than the reporting interval specified to rcapd (with rcapadm(1M)), the output for some intervals can be zero. This is because rcapd does not update statistics more frequently than the interval specified with rcapadm, and this interval is independent of (and less precise than) the sampling interval used by rcapstat.
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