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## org.apache.hadoop.util
Class ProcfsBasedProcessTree

    java.lang.Object
      org.apache.hadoop.util.ProcessTree
          org.apache.hadoop.util.ProcfsBasedProcessTree

    public class ProcfsBasedProcessTree

extends ProcessTree

A Proc file-system based ProcessTree. Works only on Linux.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.util.ProcessTree
`ProcessTree.Signal`

Field Summary
`static long` | `JIFFY_LENGTH_IN_MILLIS`
`static long` | `PAGE_SIZE`

Fields inherited from class org.apache.hadoop.util.ProcessTree
`isSetsidAvailable`

Constructor Summary
`ProcfsBasedProcessTree(String pid)`
`ProcfsBasedProcessTree(String pid, boolean setsidUsed)`
`ProcfsBasedProcessTree(String pid, String procfsDir)`

Method Summary
`long` | `getCumulativeCpuTime()` Get the CPU time in millisecond used by all the processes in the process-tree since the process-tree created
`long` | `getCumulativeRssmem()` Get the cumulative resident set size (rss) memory used by all the processes in the process-tree.
`long` | `getCumulativeRssmem(int olderThanAge)` Get the cumulative resident set size (rss) memory used by all the processes in the process-tree that are older than the passed in age.
`long` | `getCumulativeVmem()` Get the cumulative virtual memory used by all the processes in the process-tree.
`long` | `getCumulativeVmem(int olderThanAge)` Get the cumulative virtual memory used by all the processes in the process-tree that are older than the passed in age.
`ProcfsBasedProcessTree` | `getProcessTree()` Get the process-tree with latest state.
`String` | `getProcessTreeDump()` Get a dump of the process-tree.
`boolean` | `isAlive()` Is the root-process alive?
`boolean` | `isAnyProcessInTreeAlive()` Is any of the subprocesses in the process-tree alive?
`static boolean` | `isAvailable()` Checks if the ProcfsBasedProcessTree is available on this system.
`String` | `toString()` Returns a string printing PIDs of process present in the ProcfsBasedProcessTree.

Methods inherited from class org.apache.hadoop.util.ProcessTree
`isAlive, isProcessGroupAlive, killProcess, killProcessGroup`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### PAGE_SIZE

    public static final long PAGE_SIZE

### JIFFY_LENGTH_IN_MILLIS

    public static final long JIFFY_LENGTH_IN_MILLIS

Constructor Detail

### ProcfsBasedProcessTree

    public ProcfsBasedProcessTree(String pid)

### ProcfsBasedProcessTree

    public ProcfsBasedProcessTree(String pid,
                                  boolean setsidUsed)

### ProcfsBasedProcessTree

    public ProcfsBasedProcessTree(String pid,
                                  String procfsDir)

Method Detail

### isAvailable

    public static boolean isAvailable()

  Checks if the ProcfsBasedProcessTree is available on this system.

  Returns:
    true if ProcfsBasedProcessTree is available. False otherwise.

### getProcessTree

    public ProcfsBasedProcessTree getProcessTree()

  Get the process-tree with latest state. If the root-process is not alive, an empty tree will be returned.

  Returns:
    the process-tree with latest state.

### isAlive

    public boolean isAlive()

  Is the root-process alive?

  Returns:
    true if the root-process is alive, false otherwise.

### isAnyProcessInTreeAlive

    public boolean isAnyProcessInTreeAlive()

  Is any of the subprocesses in the process-tree alive?

  Returns:
    true if any of the processes in the process-tree is alive, false otherwise.

### getProcessTreeDump

    public String getProcessTreeDump()

  Get a dump of the process-tree.

  Returns:
    a string concatenating the dump of information of all the processes in the process-tree

### getCumulativeVmem

    public long getCumulativeVmem()

  Get the cumulative virtual memory used by all the processes in the process-tree.

  Returns:
    cumulative virtual memory used by the process-tree in bytes.

### getCumulativeRssmem

    public long getCumulativeRssmem()

  Get the cumulative resident set size (rss) memory used by all the processes in the process-tree.

  Returns:
    cumulative rss memory used by the process-tree in bytes. return 0 if it cannot be calculated

### getCumulativeVmem

    public long getCumulativeVmem(int olderThanAge)

  Get the cumulative virtual memory used by all the processes in the process-tree that are older than the passed in age.

  Parameters:
    `olderThanAge` - processes above this age are included in the memory addition
  Returns:
    cumulative virtual memory used by the process-tree in bytes, for processes older than this age.

### getCumulativeRssmem

    public long getCumulativeRssmem(int olderThanAge)

  Get the cumulative resident set size (rss) memory used by all the processes in the process-tree that are older than the passed in age.

  Parameters:
    `olderThanAge` - processes above this age are included in the memory addition
  Returns:
    cumulative rss memory used by the process-tree in bytes, for processes older than this age. return 0 if it cannot be calculated

### getCumulativeCpuTime

    public long getCumulativeCpuTime()

  Get the CPU time in millisecond used by all the processes in the process-tree since the process-tree created

  Returns:
    cumulative CPU time in millisecond since the process-tree created return 0 if it cannot be calculated

### toString

    public String toString()

  Returns a string printing PIDs of process present in the ProcfsBasedProcessTree. Output format : [pid pid ..]

  Overrides:
    `toString` in class `Object`

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