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Tune Your Garbage-Collector!
@bboreham
Stack vs Heap
2http://www.clipartpanda.com/clipart_images/stack-files-max-39545601 Photo: JohnNyberg, rgbstock.com
GC Tuning Options
3
-Xmsn
-Xmxn
-XX:-UseConcMarkSweepGC
-XX:-UseParallelGC
-XX:-UseParallelOldGC
-XX:-UseSerialGC
-XX:+UseG1GC
-XX:+UseGCOverheadLimit
-XX:MaxGCPauseMillis=n
-XX:InitiatingHeapOccupancyPercent
-XX:MaxTenuringThreshold=n
-XX:+ScavengeBeforeFullGC
-XX:ParallelGCThreads=n
-XX:ConcGCThreads=n
-XX:G1ReservePercent=n
-XX:G1HeapRegionSize=n
-XX:MaxHeapFreeRatio=n
-XX:MaxNewSize=size
-XX:MaxPermSize=n
-XX:MinHeapFreeRatio=n
-XX:NewSize=n
-XX:NewRatio=n
-XX:SurvivorRatio=n
-XX:TargetSurvivorRatio=n
-XX:+HandlePromotionFailure
GOGC
Go GC Options
4
The Go heap.
5
Allocate some more memory
6
Garbage-Collect!
7
Allocate more memory
8
Garbage collect!
9
Allocate much more memory!
10
Garbage collect!
11
Allocate!
12
Garbage collect!
13
Chart it!
14
Growth
before
next GC
Heap size
after GC
GOGC
15
100%
Heap size
after GC
Situation: large stable data set
16
GOGC=50
20 GBytes
Situation: small heap, very rapid GC
17
GOGC=400
10 MBytes
GOGC=off
What if we turn off GC completely?
18
GOGC=off go build ./...
19
Normal
7.3 seconds
5.3 seconds
GOGC=off
Try it out!
20
Situation Action + -
Large static
data set
GOGC ➡ Smaller heap More CPU
Tiny heap,
rapid GC
GOGC Lower latency More RAM
One-shot
execution
GOGC=off Runs faster May explode
THANK YOU!
21
@bboreham
More information
22
Good explanation of GOGC and other settings

https://dave.cheney.net/tag/gogc

Really detailed history https://blog.golang.org/ismmkeynote

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Tune Your Go Garbage-Collector