in Production Markus Weninger Johannes Kepler University Linz, - - PowerPoint PPT Presentation

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in Production Markus Weninger Johannes Kepler University Linz, - - PowerPoint PPT Presentation

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Analyzing Memory Errors in Production Markus Weninger Johannes Kepler University Linz, Austria Institute for System Software WHO ARE WE? Fixing Memory Problems In Production 2 WHO ARE WE? Fixing Memory Problems In Production 2 WHO ARE WE?

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SLIDE 1

Analyzing Memory Errors in Production

Markus Weninger Johannes Kepler University Linz, Austria Institute for System Software

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SLIDE 2

WHO ARE WE?

Fixing Memory Problems In Production 2

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SLIDE 3

WHO ARE WE?

Fixing Memory Problems In Production 2

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SLIDE 4

WHO ARE WE?

Fixing Memory Problems In Production 2

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SLIDE 5

WHO ARE WE?

Fixing Memory Problems In Production 2

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SLIDE 6

WHO ARE WE?

Fixing Memory Problems In Production 2

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SLIDE 7

WHO ARE WE?

Fixing Memory Problems In Production 2

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SLIDE 8

WHO ARE WE?

For what? To find and fix memory anomalies!

Fixing Memory Problems In Production 2

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SLIDE 9

MOTIVATION

3 Fixing Memory Problems In Production

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SLIDE 10

MOTIVATION

3 Fixing Memory Problems In Production

Jake

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SLIDE 11

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 12

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 13

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 14

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 15

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 16

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 17

MOTIVATION

3 Fixing Memory Problems In Production

Jake July

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SLIDE 18

4 Fixing Memory Problems In Production

* not actually Jake

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4 Fixing Memory Problems In Production

Why is my program crashing?

* not actually Jake

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4 Fixing Memory Problems In Production

Why is my program crashing?

* not actually Jake

Let‘s try a memory analysis tool!

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SLIDE 21

PROBLEM

5 Fixing Memory Problems In Production

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PROBLEM

5 Fixing Memory Problems In Production

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PROBLEM

5 Fixing Memory Problems In Production

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SLIDE 24

PROBLEM

5 Fixing Memory Problems In Production

I am new to all of this!

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PROBLEM

5 Fixing Memory Problems In Production

I am new to all of this! What should I look for?

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SLIDE 26

PROBLEM

5 Fixing Memory Problems In Production

I am new to all of this! What should I look for? When to use which feature?

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SLIDE 27

PROBLEM

5 Fixing Memory Problems In Production

I am new to all of this! What should I look for? When to use which feature? <another question about memory analysis> ...

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SLIDE 28

POLL TIME

6 Fixing Memory Problems In Production

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POLL TIME

6 Fixing Memory Problems In Production

1 2 3 4 5 6 Used a memory analysis tool before Manually took a heap dump Knows what trace-based memory analysis is Could describe what a dominator tree is Dummy Series 1 Dummy Series 2 Dummy Series 3

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USERS NEED GUIDANCE

Fixing Memory Problems In Production 7

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

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SLIDE 33

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis GC root

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SLIDE 35

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis GC root

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SLIDE 36

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis GC root

... ... ... ...

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SLIDE 37

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis GC root

... ... ... ... ...

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SLIDE 38

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis GC root

... ... ... ... ...

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SLIDE 39

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

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SLIDE 41

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

...

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

...

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SLIDE 43

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

...

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SLIDE 44

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

...

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive?

...

...

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive? GC root GC root

...

...

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive? GC root GC root 1 Mio. 10,000 10,000 10,000 1 Mio. 1 Mio.

...

...

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MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive? GC root GC root 1 Mio. 10,000 10,000 10,000 1 Mio. 1 Mio.

...

...

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SLIDE 49

MEMORY ANALYSIS 101

Fixing Memory Problems In Production 8

Top-down analysis Bottom-up analysis GC root

... ... ... ...

Which single object / GC root keeps the most other objects alive? GC root GC root 1 Mio. 10,000 10,000 10,000 1 Mio. 1 Mio.

...

Analyze why a certain group of

  • bjects accumulates over time

...

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DOMINATOR TREE

Fixing Memory Problems In Production 9

GC Roots L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

Object Reference Graph

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DOMINATOR TREE

Fixing Memory Problems In Production 9

GC Roots L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

  • Dom. Tree Root

L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

Object Reference Graph Dominator Tree

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SLIDE 52

DOMINATOR TREE

Fixing Memory Problems In Production 10

GC Roots L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

  • Dom. Tree Root

L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

Object Reference Graph Dominator Tree

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DOMINATOR TREE

Fixing Memory Problems In Production 10

GC Roots L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

  • Dom. Tree Root

L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

Object Reference Graph Dominator Tree What happens if we could free L1?

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DOMINATOR TREE

Fixing Memory Problems In Production 11

GC Roots L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

  • Dom. Tree Root

L1 L2 N1 N2 N3 N4 N5 D1 D2 D3 D4 D5 D6 D7 D8 N6 N7 N8 N9

N10

Object Reference Graph Dominator Tree These can be collected too

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SLIDE 55

Fixing Memory Problems In Production 12

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Fixing Memory Problems In Production 12

Thanks Markus, but that seems like a lot to learn...

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SLIDE 57

Fixing Memory Problems In Production 12

Thanks Markus, but that seems like a lot to learn...

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Fixing Memory Problems In Production 12

Thanks Markus, but that seems like a lot to learn... Okay, let us try to improve that in AntTracks

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ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase

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ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X()

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ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X()

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ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X()

Trace file

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SLIDE 63

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y()

Trace file

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SLIDE 64

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z()

Trace file

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SLIDE 65

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y()

Trace file

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SLIDE 66

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move

Trace file

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SLIDE 67

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move

Trace file

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SLIDE 68

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move

Trace file

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SLIDE 69

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y()

Trace file

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ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file

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ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

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SLIDE 72

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1

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SLIDE 73

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1

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SLIDE 74

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1 Heap 2

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SLIDE 75

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1 Heap 2 Heap n

…

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SLIDE 76

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1 Heap 2 Heap n

…

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SLIDE 77

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1 Heap 2 Heap n

…

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SLIDE 78

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1 Heap 2 Heap n

…

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SLIDE 79

ANTTRACKS SYSTEM OVERVIEW

Fixing Memory Problems In Production 13

AntTracks VM Application t

Mutator phase

  • Mut. phase

GC phase new X() new Y() new Z() new Y() move move move new Y() new Z()

Trace file AntTracks Analyzer Memory anomaly detection Memory leak analysis

Heap 1 Heap 2 Heap n

…

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SLIDE 80

GUIDED EXPLORATION

Fixing Memory Problems In Production 14

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SLIDE 81

GUIDED EXPLORATION

Fixing Memory Problems In Production 14

Detection describes the task of automatically detecting a potential problem, i.e., a suspicious pattern.

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GUIDED EXPLORATION

Fixing Memory Problems In Production 14

Detection describes the task of automatically detecting a potential problem, i.e., a suspicious pattern. Highlighting the relevant region on the UI helps users to understand where the automatically gained insight can be found if the view was inspected manually.

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SLIDE 83

GUIDED EXPLORATION

Fixing Memory Problems In Production 14

Detection describes the task of automatically detecting a potential problem, i.e., a suspicious pattern. Highlighting the relevant region on the UI helps users to understand where the automatically gained insight can be found if the view was inspected manually. Explanation of the highlighted visualization helps users to interpret it and explains concepts that are needed for this interpretation.

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SLIDE 84

GUIDED EXPLORATION

Fixing Memory Problems In Production 14

Detection describes the task of automatically detecting a potential problem, i.e., a suspicious pattern. Highlighting the relevant region on the UI helps users to understand where the automatically gained insight can be found if the view was inspected manually. Explanation of the highlighted visualization helps users to interpret it and explains concepts that are needed for this interpretation. Suggestions on which steps could / should be taken next make it easier for the user to understand what operations are possible and why they might be useful.

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SLIDE 85

GUIDED EXPLORATION

Fixing Memory Problems In Production 14

Detection describes the task of automatically detecting a potential problem, i.e., a suspicious pattern. Highlighting the relevant region on the UI helps users to understand where the automatically gained insight can be found if the view was inspected manually. Explanation of the highlighted visualization helps users to interpret it and explains concepts that are needed for this interpretation. Suggestions on which steps could / should be taken next make it easier for the user to understand what operations are possible and why they might be useful.

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DEMO: EASYTRAVEL

Fixing Memory Problems In Production 15

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SLIDE 87

DEMO: OVERVIEW

Fixing Memory Problems In Production 16

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DEMO: OVERVIEW (1) DETECTION + (2) HIGHLIGHTING

Fixing Memory Problems In Production 17

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DEMO: OVERVIEW (3) EXPLANATION + (4) SUGGESTION

Fixing Memory Problems In Production 18

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DEMO: EVOLUTION

Fixing Memory Problems In Production 19

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DEMO: EVOLUTION

Fixing Memory Problems In Production 20

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DEMO: EVOLUTION

Fixing Memory Problems In Production 20

Date objects allocated in the constructor of Base are the major suspects for a memory leak since about 30% of the

  • verall

heap growth is accounted to them. Inspect who keeps them alive.

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DEMO: GRAPH VIEW

Fixing Memory Problems In Production 21

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DEMO: GRAPH VIEW

Fixing Memory Problems In Production 22

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SLIDE 95

DEMO: GRAPH VIEW

Fixing Memory Problems In Production 23

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SLIDE 96

DEMO: GRAPH VIEW

Fixing Memory Problems In Production 23

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SLIDE 97

DEMO: GRAPH VIEW

Fixing Memory Problems In Production 23

Too many ArrayList<Location> are added here.

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SLIDE 98

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 24

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SLIDE 99

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 25

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SLIDE 100

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 26

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SLIDE 101

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 27

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SLIDE 102

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 27

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SLIDE 103

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 27

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SLIDE 104

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 27

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SLIDE 105

ANOTHER DEMO: FINAGLE-HTTP

Fixing Memory Problems In Production 27

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SLIDE 106

DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request)

Fixing Memory Problems In Production 28

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DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) }

Fixing Memory Problems In Production 28

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DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) }

Fixing Memory Problems In Production 28

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DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) } val h = { rep: http.Response => totalLength += rep.content.length } for (i <- 0 until NUM_REQUESTS { Await.result(response.onSuccess(h)) }

Fixing Memory Problems In Production 28

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SLIDE 110

DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) } val h = { rep: http.Response => totalLength += rep.content.length } for (i <- 0 until NUM_REQUESTS { Await.result(response.onSuccess(h)) }

Fixing Memory Problems In Production 28

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SLIDE 111

DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) } val h = { rep: http.Response => totalLength += rep.content.length } for (i <- 0 until NUM_REQUESTS { Await.result(response.onSuccess(h)) }

Fixing Memory Problems In Production 28

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SLIDE 112

DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) } val h = { rep: http.Response => totalLength += rep.content.length } for (i <- 0 until NUM_REQUESTS { Await.result(response.onSuccess(h)) }

Fixing Memory Problems In Production 28

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SLIDE 113

DEMO: FINAGLE-HTTP

val response: Future[http.Response] = client(request) for (i <- 0 until NUM_REQUESTS) { Await.result(response.onSuccess { rep: http.Response => totalLength += rep.content.length }) } val h = { rep: http.Response => totalLength += rep.content.length } for (i <- 0 until NUM_REQUESTS { Await.result(response.onSuccess(h)) }

Fixing Memory Problems In Production 28

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SLIDE 114

TAKE-AWAYS

Fixing Memory Problems In Production 29

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SLIDE 115

TAKE-AWAYS

Fixing Memory Problems In Production 29

Memory Analysis Top-down Bottom-up Heap dumps Trace-based ... and 100 other things

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SLIDE 116

TAKE-AWAYS

Fixing Memory Problems In Production 29

Memory Analysis Problem Top-down Bottom-up Heap dumps Trace-based ... and 100 other things New users need guidance to get started faster It is not enough to „throw tools at them“

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SLIDE 117

TAKE-AWAYS

Fixing Memory Problems In Production 29

Memory Analysis Problem Guided Exploration Top-down Bottom-up Heap dumps Trace-based ... and 100 other things New users need guidance to get started faster It is not enough to „throw tools at them“ Detection Highlighting Explanation Suggestion

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SLIDE 118

TAKE-AWAYS

Fixing Memory Problems In Production 29

Memory Analysis Problem Guided Exploration Top-down Bottom-up Heap dumps Trace-based ... and 100 other things New users need guidance to get started faster It is not enough to „throw tools at them“ Detection Highlighting Explanation Suggestion Markus Weninger

Johannes Kepler University Linz, Austria markus.weninger@jku.at http://mevss.jku.at/AntTracks http://bit.ly/weninger_ssw

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SLIDE 119

Additional Notes

 Some icons made by Freepik & Smashicons from https://www.flaticon.com  Some photos made by bruce mars and Isaque Pereira from Pexels

Fixing Memory Problems In Production 30