Slide 1
Slide 1 text
Minor GC (Scavenge)
1. Let us assume that there are already objects on the “to-space” when we
start(Blocks 01 to 06 marked as used memory)
2. The process creates a new object(07)
3. V8 tries to get required memory from the from-space, but there is no free
space in there to accommodate our object and hence V8 triggers minor GC
Slide 2
Slide 2 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
From-space To-space
01 02 03
04
05 06
07
(new object)
Slide 3
Slide 3 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
From-space To-space
01
02 03
04
05 06
07
(new object)
Slide 4
Slide 4 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
From-space To-space
01
02 03
04
05
06
07
(new object)
Slide 5
Slide 5 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
From-space To-space
01
02 03
04
05
06
07
(new object)
Slide 6
Slide 6 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
To-space From-space
01 03 05
07
(new object)
Slide 7
Slide 7 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
To-space From-space
01 03 05
07
(new object)
Slide 8
Slide 8 text
Second Minor GC
1. Let us assume that some time have passed and there are more objects on
the “from-space” now(Blocks 07 to 09 marked as used memory)
2. The process creates a new object(10)
3. V8 tries to get required memory from the from-space, but there is no free
space in there to accommodate our object and hence V8 triggers second
minor GC
Slide 9
Slide 9 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
To-space From-space
01 03 05
07 08 09
10
(new object)
Slide 10
Slide 10 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
To-space From-space
01
03
05
07
08
09
10
(new object)
Slide 11
Slide 11 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
To-space From-space
01
03
05
07
08
09
10
(new object)
Slide 12
Slide 12 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
From-space To-space
01
05
07 09
10
(new object)
Slide 13
Slide 13 text
Minor GC
Heap memory
New space (Young generation)
Old generation
(Old space)
Pointer space
Orphan Used memory Free memory
Large object space Code space
Cell space
Property cell space
Map space
Data space
From-space To-space
01
05
07 09
10
(new object)