CacheStatistics (SystemDS 2.0.0 API)

java.lang.Object
- org.apache.sysds.runtime.controlprogram.caching.CacheStatistics

```
public class CacheStatistics
extends Object
```
This singleton provides basic caching statistics in CP. 1) Hit statistics for caching (mem, fs, hdfs, total) NOTE: In order to provide accurate statistics in multi-threaded synchronized increments are required. Since those functions are called potentially very often, we use atomic increments (compare and swap) instead of heavy-weight 'synchronized' methods.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class CacheStatistics.Stat

Nested Classes
Modifier and Type	Class and Description
`static class`	`CacheStatistics.Stat`

Constructor Summary

Constructors
Constructor and Description

CacheStatistics()

Constructors
Constructor and Description
`CacheStatistics()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String`	`displayHits()`
`static String`	`displayTime()`
`static String`	`displayWrites()`
`static long`	`getAcquireMTime()`
`static long`	`getAcquireRTime()`
`static long`	`getExportTime()`
`static long`	`getFSBuffHits()`
`static long`	`getFSBuffWrites()`
`static long`	`getFSHits()`
`static long`	`getFSWrites()`
`static long`	`getHDFSHits()`
`static long`	`getHDFSWrites()`
`static long`	`getMemHits()`
`static long`	`getReleaseTime()`
`static void`	`incrementAcquireMTime(long delta)`
`static void`	`incrementAcquireRTime(long delta)`
`static void`	`incrementExportTime(long delta)`
`static void`	`incrementFSBuffHits()`
`static void`	`incrementFSBuffHits(int delta)`
`static void`	`incrementFSBuffWrites()`
`static void`	`incrementFSBuffWrites(int delta)`
`static void`	`incrementFSHits()`
`static void`	`incrementFSHits(int delta)`
`static void`	`incrementFSWrites()`
`static void`	`incrementFSWrites(int delta)`
`static void`	`incrementHDFSHits()`
`static void`	`incrementHDFSHits(int delta)`
`static void`	`incrementHDFSWrites()`
`static void`	`incrementHDFSWrites(int delta)`
`static void`	`incrementMemHits()`
`static void`	`incrementMemHits(int delta)`
`static void`	`incrementReleaseTime(long delta)`
`static void`	`reset()`

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

Constructor Detail
- CacheStatistics
```
public CacheStatistics()
```

Method Detail

reset
```
public static void reset()
```

incrementMemHits
```
public static void incrementMemHits()
```

incrementMemHits

public static void incrementMemHits(int delta)

getMemHits
```
public static long getMemHits()
```

incrementFSBuffHits

public static void incrementFSBuffHits()

incrementFSBuffHits

public static void incrementFSBuffHits(int delta)

getFSBuffHits
```
public static long getFSBuffHits()
```

incrementFSHits
```
public static void incrementFSHits()
```

incrementFSHits

public static void incrementFSHits(int delta)

getFSHits
```
public static long getFSHits()
```

incrementHDFSHits

public static void incrementHDFSHits()

incrementHDFSHits

public static void incrementHDFSHits(int delta)

getHDFSHits
```
public static long getHDFSHits()
```

incrementFSBuffWrites

public static void incrementFSBuffWrites()

incrementFSBuffWrites

public static void incrementFSBuffWrites(int delta)

getFSBuffWrites
```
public static long getFSBuffWrites()
```

incrementFSWrites

public static void incrementFSWrites()

incrementFSWrites

public static void incrementFSWrites(int delta)

getFSWrites
```
public static long getFSWrites()
```

incrementHDFSWrites

public static void incrementHDFSWrites()

incrementHDFSWrites

public static void incrementHDFSWrites(int delta)

getHDFSWrites
```
public static long getHDFSWrites()
```

incrementAcquireRTime

public static void incrementAcquireRTime(long delta)

getAcquireRTime
```
public static long getAcquireRTime()
```

incrementAcquireMTime

public static void incrementAcquireMTime(long delta)

getAcquireMTime
```
public static long getAcquireMTime()
```

incrementReleaseTime

public static void incrementReleaseTime(long delta)

getReleaseTime
```
public static long getReleaseTime()
```

incrementExportTime

public static void incrementExportTime(long delta)

getExportTime
```
public static long getExportTime()
```

displayHits
```
public static String displayHits()
```

displayWrites
```
public static String displayWrites()
```

displayTime
```
public static String displayTime()
```

Class CacheStatistics

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

CacheStatistics

Method Detail

reset

incrementMemHits

incrementMemHits

getMemHits

incrementFSBuffHits

incrementFSBuffHits

getFSBuffHits

incrementFSHits

incrementFSHits

getFSHits

incrementHDFSHits

incrementHDFSHits

getHDFSHits

incrementFSBuffWrites

incrementFSBuffWrites

getFSBuffWrites

incrementFSWrites

incrementFSWrites

getFSWrites

incrementHDFSWrites

incrementHDFSWrites

getHDFSWrites

incrementAcquireRTime

getAcquireRTime

incrementAcquireMTime

getAcquireMTime

incrementReleaseTime

getReleaseTime

incrementExportTime

getExportTime

displayHits

displayWrites

displayTime