Stats (Jikes RVM API)

java.lang.Object
- org.mmtk.utility.statistics.Stats

```
public class Stats
extends Object
```
This class implements basic statistics functionality.
In general, statistics are only available if gathering has been enabled. The sole exception is the count of collections which is always available.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

(package private) static class Stats.Phase

Nested Classes
Modifier and Type	Class and Description
`(package private) static class`	`Stats.Phase`

Field Summary

Fields
Modifier and Type	Field and Description
`private static Counter[]`	`counter`
`private static int`	`counters`
`(package private) static boolean`	`exceededPhaseLimit`
`static boolean`	`GATHER_MARK_CONS_STATS`
`(package private) static boolean`	`gatheringStats`
`private static int`	`gcCount`
`(package private) static int`	`MAX_COUNTERS` Maximum number of counters that can be in operation
`(package private) static int`	`MAX_PHASES` Maximum number of gc/mutator phases that can be counted
`(package private) static int`	`phase`

Constructor Summary

Constructors
Constructor and Description

Stats()

Constructors
Constructor and Description
`Stats()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`private static void`	`closeStatXml()`
`static void`	`endGC()` End a GC phase.
`static boolean`	`gatheringStats()`
`static int`	`gcCount()` Returns the total count of collections.
`(package private) static void`	`newCounter(Counter ctr)` Add a new counter to the set of managed counters.
`private static void`	`openStatXml(String name)`
`private static void`	`printColumnNames()` Print out statistics column names
`static void`	`printPhases()` Print out statistics for each mutator/gc phase
`private static void`	`printPhaseStatXml(Counter c, int p, Stats.Phase phase)` Print a single phase counter in an xml tag
`static void`	`printPhasesXml()` Print out statistics for each mutator/gc phase in Xml format
`static void`	`printStats()`
`static void`	`printStatsPlain()` Print out statistics
`static void`	`printStatsXml()` Print command-line options and statistics in XML format
`static void`	`printTotals()` Print out statistics totals
`static void`	`printTotalsXml()` Print out statistics totals in Xml format
`private static void`	`printTotalXml(Counter c, Stats.Phase phase)` Print a single total in an xml tag
`static void`	`startAll()` Start all implicitly started counters (i.e. those for whom `start == true`).
`static void`	`startGC()` Start a new GC phase.
`static void`	`stopAll()` Stop all counters
`private static void`	`stopAllCounters()` Stop all counters

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

- Field Detail
  - GATHER_MARK_CONS_STATS
```
public static final boolean GATHER_MARK_CONS_STATS
```
    See Also:
    
    Constant Field Values
  - MAX_PHASES
```
static final int MAX_PHASES
```
    Maximum number of gc/mutator phases that can be counted
    
    See Also:
    
    Constant Field Values
  - MAX_COUNTERS
```
static final int MAX_COUNTERS
```
    Maximum number of counters that can be in operation
    
    See Also:
    
    Constant Field Values
  - counters
```
private static int counters
```
  - counter
```
private static Counter[] counter
```
  - phase
```
static int phase
```
  - gcCount
```
private static int gcCount
```
  - gatheringStats
```
static boolean gatheringStats
```
  - exceededPhaseLimit
```
static boolean exceededPhaseLimit
```
- Constructor Detail
  - Stats
```
public Stats()
```
- Method Detail
  - newCounter
```
static void newCounter(Counter ctr)
```
    Add a new counter to the set of managed counters.
    
    Parameters:
    
    ctr - The counter to be added.
  - startGC
```
public static void startGC()
```
    Start a new GC phase. This means notifying each counter of the phase change.
  - endGC
```
public static void endGC()
```
    End a GC phase. This means notifying each counter of the phase change.
  - startAll
```
public static void startAll()
```
    Start all implicitly started counters (i.e. those for whom start == true).
  - stopAll
```
public static void stopAll()
```
    Stop all counters
  - stopAllCounters
```
private static void stopAllCounters()
```
    Stop all counters
  - printStats
```
public static void printStats()
```
  - printStatsPlain
```
public static void printStatsPlain()
```
    Print out statistics
  - printTotals
```
public static void printTotals()
```
    Print out statistics totals
  - printPhases
```
public static void printPhases()
```
    Print out statistics for each mutator/gc phase
  - printColumnNames
```
private static void printColumnNames()
```
    Print out statistics column names
  - printStatsXml
```
public static void printStatsXml()
```
    Print command-line options and statistics in XML format
  - openStatXml
```
private static void openStatXml(String name)
```
  - closeStatXml
```
private static void closeStatXml()
```
  - printTotalsXml
```
public static void printTotalsXml()
```
    Print out statistics totals in Xml format
  - printTotalXml
```
private static void printTotalXml(Counter c,
                                  Stats.Phase phase)
```
    Print a single total in an xml tag
    
    Parameters:
    
    c - The counter
    
    phase - The phase
  - printPhaseStatXml
```
private static void printPhaseStatXml(Counter c,
                                      int p,
                                      Stats.Phase phase)
```
    Print a single phase counter in an xml tag
    
    Parameters:
    
    c - The counter
    
    p - The phase number
    
    phase - The phase (null, "mu" or "gc")
  - printPhasesXml
```
public static void printPhasesXml()
```
    Print out statistics for each mutator/gc phase in Xml format
  - gcCount
```
public static int gcCount()
```
    Returns the total count of collections.
    Note: This count is available even when gathering of statistics is disabled.
    
    Returns:
    
    The GC count (inclusive of any in-progress GC)
  - gatheringStats
```
public static boolean gatheringStats()
```
    Returns:
    
    true if currently gathering stats

Class Stats

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

GATHER_MARK_CONS_STATS

MAX_PHASES

MAX_COUNTERS

counters

counter

phase

gcCount

gatheringStats

exceededPhaseLimit

Constructor Detail

Stats

Method Detail

newCounter

startGC

endGC

startAll

stopAll

stopAllCounters

printStats

printStatsPlain

printTotals

printPhases

printColumnNames

printStatsXml

openStatXml

closeStatXml

printTotalsXml

printTotalXml

printPhaseStatXml

printPhasesXml

gcCount

gatheringStats