агенты домена метрики производительности ядра операционной системы (operating system kernel performance metrics domain agents)
Имя (Name)
pmdaaix, pmdadarwin, pmdafreebsd, pmdalinux, pmdanetbsd,
pmdasolaris, pmdawindows - operating system kernel performance
metrics domain agents
Синопсис (Synopsis)
$PCP_PMDAS_DIR/aix/pmdaaix [-d domain] [-l logfile] [-U username]
$PCP_PMDAS_DIR/darwin/pmdadarwin [-d domain] [-l logfile] [-U
username]
$PCP_PMDAS_DIR/freebsd/pmdafreebsd [-d domain] [-l logfile] [-U
username]
$PCP_PMDAS_DIR/linux/pmdalinux [-d domain] [-l logfile] [-U
username]
$PCP_PMDAS_DIR/netbsd/pmdanetbsd [-d domain] [-l logfile] [-U
username]
$PCP_PMDAS_DIR/solaris/pmdasolaris [-d domain] [-l logfile] [-U
username]
$PCP_PMDAS_DIR/windows/pmdawindows [-d domain] [-l logfile] [-U
username]
Описание (Description)
Each supported platform has a kernel Performance Metrics Domain
Agent (PMDA) which extracts performance metrics from the kernel
of that platfrom. A variety of platform-specific metrics are
available, with an equally varied set of access mechanisms -
typically this involves special system calls, or reading from
files in kernel virtual filesystems such as the Linux sysfs and
procfs filesystems.
The platform kernel PMDA is one of the most critical components
of the PCP installation, and must be as efficient and reliable as
possible. In all installations the default kernel PMDA will be
installed as a shared library and thus executes directly within
the pmcd(1) process. This slightly reduces overheads associated
with querying the metadata and values associated with these
metrics (no message passing is required).
Unlike many other PMDAs, the kernel PMDA exports a number of
metric namespace subtrees, such as kernel, network, swap, mem,
ipc, filesys, nfs, disk and hinv (hardware inventory).
Despite usually running as shared libraries, most installations
also include a stand-alone executable for the kernel PMDA. This
is to aid profiling and debugging activities, with dbpmda(1) for
example. In this case (but not for shared libraries), the
following command line options are available:
-d It is absolutely crucial that the performance metrics domain
number specified here is unique and consistent. That is,
domain should be different for every PMDA on the one host,
and the same domain number should be used for the same PMDA
on all hosts.
-l Location of the log file. By default, a log file named
[platform].log is written in the current directory of
pmcd(1) when pmda[platform] is started, i.e.
$PCP_LOG_DIR/pmcd. If the log file cannot be created or is
not writable, output is written to the standard error
instead.
-U User account under which to run the agent. The default is
the unprivileged "pcp" account in current versions of PCP,
but in older versions the superuser account ("root") was
used by default.
Установка (Installation)
Access to the names, help text and values for the kernel
performance metrics is available by default - unlike most other
agents, no action is required to enable them and they should not
be removed.
Файлы (Files)
$PCP_PMDAS_DIR/[platform]/help
default help text file for the the kernel metrics
$PCP_LOG_DIR/pmcd/[platform].log
default log file for error messages and other information
from the kernel PMDA.
Окружение PCP (PCP environment)
Environment variables with the prefix PCP_ are used to
parameterize the file and directory names used by PCP. On each
installation, the file /etc/pcp.conf contains the local values
for these variables. The $PCP_CONF variable may be used to
specify an alternative configuration file, as described in
pcp.conf(5).
Смотри также (See also)
PCPIntro(1), dbpmda(1), pmcd(1), pcp.conf(5) and pcp.env(5).
