Cached metrics interfaces are
used when the system configuration
changes to inform the libperfstat API that it must reset cached
metrics, which consist of values that seldom change such as disk size
or processor description.
The following
table lists the metrics that are cached:
| Object |
Content |
Sample value |
|---|
| perfstat_cpu_total |
char cpu_description [IDENTIFIER_LENGTH] u_longlong_t
processorHZ |
PowerPC_POWER3375000000 |
| perfstat_diskadapter |
The list of disk adapters The number of disk
adapters u_longlong_t size u_longlong_t
free char description [IDENTIFIER_LENGTH] |
scsi0, scsi1, ide0 3 17344 15296 Wide/Ultra-3
SCSI I/O Controller |
| perfstat_pagingspace |
The list of paging spaces The number of paging
spaces char automatic char type
longlong_t lpsize longlong_t mbsize char
hostname [IDENTIFIER_LENGTH] char filename [IDENTIFIER_LENGTH] |
hd6 1 1 NFS_PAGING 16 512pompei or rootvg /var/tmp/nfsswap/swapfile1 |
| perfstat_disk |
char adapter [IDENTIFIER_LENGTH] char
description [IDENTIFIER_LENGTH] char vgname [IDENTIFIER_LENGTH] u_longlong_t
sizeu_longlong_t free |
scsi0
16 Bit LVD SCSI Disk Drive rootvg 17344
15296 |
| perfstat_diskpath |
char adapter [IDENTIFIER_LENGTH] |
scsi0 |
| perfstat_netinterface |
char description [IDENTIFIER_LENGTH] |
Standard Ethernet Network Interface |
| perfstat_logicalvolume |
char description [IDENTIFIER_LENGTH] |
Logical volume1 |
| perfstat_volumegroup |
char
description [IDENTIFIER_LENGTH] |
Volume
group1 |
You
can use the following
AIX® interfaces
to refresh
the cached metrics:
| Interface |
Purpose |
Definition of interface |
|---|
| perfstat_reset |
Resets every cached metric |
void perfstat_reset (void); |
| perfstat_partial_reset |
Resets selected cached metrics or resets the
system's minimum and maximum counters for disks |
void perfstat_partial_reset (char
* name, u_longlong_t resetmask); |
The usage
of the parameters for all of the interfaces
is as follows:
| Parameter |
Usage |
|---|
char *name |
Identifies
the name of the component of the
cached metric that must be reset from the libperfstat API cache.
If the value of the parameter is NULL, this signifies all of the components. |
u_longlong_t resetmask |
Identifies the category of the component if
the value of the name parameter is not NULL. The possible values
are: - FLUSH_CPUTOTAL
- FLUSH_DISK
- RESET_DISK_MINMAX
- FLUSH_DISKADAPTER
- FLUSH_DISKPATH
- FLUSH_NETINTERFACE
- FLUSH_PAGINGSPACE
- FLUSH_LOGICALVOLUME
- FLUSH_VOLUMEGROUP
If the value of the name parameter is NULL, the resetmask parameter
value consists of a combination of values. For example: RESET_DISK_MINMAX|FLUSH_CPUTOTAL|FLUSH_DISK |