How to use performance.memory API ?

[Liu Xiao]

Dear All:

How to use performance.memory API to get the variation of heap?

First, I run window.performance.memory in the Console of DevTools, it gives result as follow:

MemoryInfo {jsHeapSizeLimit: 1620000000, usedJSHeapSize: 10000000, totalJSHeapSize: 19300000}

Then, I allocate lots of memory by JavaScript and run it again, but the given result don't change. 

MemoryInfo {jsHeapSizeLimit: 1620000000, usedJSHeapSize: 10000000, totalJSHeapSize: 19300000}

But by the Heap Snapshot, it indeed increases to 24.8MB. 

And by Timeline, it also indeed increases. 

How do I understand the result？

Thank you very much.

[Ilya Tikhonovsky]

You need to run chrome with --enable-memory-info flag.

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[Mikhail Naganov]

BTW, we have killed this flag as a part of "flags cleanup" effort, see http://crbug.com/350339

So the only way to watch for detailed memory consumption deltas is to use Heap Profiler.

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[jah...@groupon.com]

What about --enable-precise-memory-info?

[PhistucK]

The comment seems to suggest that this new (May, 2014) flag only works for Workers​ (Shared or otherwise)?

This is the issue - crbug.com/326370.

This seems to have been added after the cleanup has started (February, 2014). Given that the previous flag went away in the cleanup, I am not sure this flag is acceptable in the long term...

☆PhistucK

On Wed, Dec 10, 2014 at 11:24 PM, <jah...@groupon.com> wrote:

What about --enable-precise-memory-info?

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