Package org.elasticsearch.monitor.os
Class OsProbe
java.lang.Object
org.elasticsearch.monitor.os.OsProbe
public class OsProbe
extends java.lang.Object
The
OsProbe
class retrieves information about the physical and swap size of the machine
memory, as well as the system load average and cpu load.
In some exceptional cases, it's possible the underlying native method used by
getFreePhysicalMemorySize()
and getTotalPhysicalMemorySize()
can return a
negative value. Because of this, we prevent those methods from returning negative values,
returning 0 instead.
The OS can report a negative number in a number of cases:
- Non-supported OSes (HP-UX, or AIX)
- A failure of macOS to initialize host statistics
- An OS that does not support the _SC_PHYS_PAGES
or _SC_PAGE_SIZE
flags for the sysconf()
linux kernel call
- An overflow of the product of _SC_PHYS_PAGES
and _SC_PAGE_SIZE
- An error case retrieving these values from a linux kernel
- A non-standard libc implementation not implementing the required values
For a more exhaustive explanation, see https://github.com/elastic/elasticsearch/pull/42725-
Method Summary
Modifier and Type Method Description long
getFreePhysicalMemorySize()
Returns the amount of free physical memory in bytes.long
getFreeSwapSpaceSize()
Returns the amount of free swap space in bytes.static OsProbe
getInstance()
short
getSystemCpuPercent()
long
getTotalPhysicalMemorySize()
Returns the total amount of physical memory in bytes.long
getTotalSwapSpaceSize()
Returns the total amount of swap space in bytes.OsStats
osStats()
-
Method Details
-
getFreePhysicalMemorySize
public long getFreePhysicalMemorySize()Returns the amount of free physical memory in bytes. -
getTotalPhysicalMemorySize
public long getTotalPhysicalMemorySize()Returns the total amount of physical memory in bytes. -
getFreeSwapSpaceSize
public long getFreeSwapSpaceSize()Returns the amount of free swap space in bytes. -
getTotalSwapSpaceSize
public long getTotalSwapSpaceSize()Returns the total amount of swap space in bytes. -
getSystemCpuPercent
public short getSystemCpuPercent() -
getInstance
-
osStats
-