Hello!
I'm @captainsafia!
safia.rocks
content warning
this is a technical talk with no code or demos.
@captainsafia
j.mp/js-mem-live
Follow along! 🎉
@captainsafia
turing machine
Von Neumann architecture
A machine that thinks is remarkable.
A MACHINE THAT REMEMBERS WHAT IT THINKS IS REVOLUTIONARY.
@captainsafia
""But my laptop has 16 gbs of memory.
Why should i care about memory performance?""
@captainsafia
User expectations and demands grow faster than memory availability.
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@captainsafia
Not all your users are using the latest tech.
@captainsafia
You don't want to be that app.
YOU KNOW THAT APP.
Let's go to class.
garbage collection
V8
@captainsafia
The Memory Heap
V8 allocates objects in memory into contiguous chunks, or spaces.
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New space
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Old pointer space
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Old data space
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Large object space
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Code space
@captainsafia
So, we've allocated objects in memory.
@captainsafia
The Memory Heap
But, how does V8 collect garbage memory?
@captainsafia
Run a short garbage collection cycle.
Halt the program.
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Scavenging
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Mark and Sweep
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How much memory is my application using?
How often do GC cycles occur in my application?
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The right tools for a messy job.
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@captainsafia
Let's try it.
@captainsafia
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memewatch
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heapdump
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v8-profiler
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performance monitoring tools
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WHen should i use all these things?
@captainsafia
""I had your To-do list app open in my browser and it makes it crash after a while!""
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""your app has jank and jitters""
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""your app just sucks""
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memory management is hard.
@captainsafia
v8 makes it easy and obfuscates the details from us.
@captainsafia
But eat your vegatables and appreciate your garbage collector. ❤️
@captainsafia