What is the maximum memory a Google App Engine app may consume?

Question

What is the maximum amount of local memory (not Memcache) each instance of a Google App engine app is allowed to consume?

I couldn\'t find any inform

Answer 1

The maximum amount of local memory is not documented.

speculation:
I believe they have not imposed any hard limits because it may depend on your application traffic/load/activity and by other GAE applications.

There's an open issue MemoryError undocumented/hard to predict that you might want to star.

EDIT:
Reading the new Backends documentation here it seems capped to 128MB

Answer 2

The maximum memory limit for an App Engine instance depends on the instance class that you choose. The default limit is 128 MB. The following classes are currently available:

• F1 and B1 - 128 MB
• F2 and B2 - 256 MB
• F4 and B4 - 512 MB
• F4_1G and B4_1G - 1024 MB

Edit: Second generation instances have double the memory:

• F1 and B1 - 256 MB
• F2 and B2 - 512 MB
• F4 and B4 - 1024 MB
• F4_HIGHMEM and B4_HIGHMEM - 2048 MB
• B8 - 2048 MB