I am seeing this behavior as well on CB 1.1.1 when doing an initial pull 
with thousands of small documents. This appears related to the following 
issue which is listed as fixed:

https://github.com/couchbase/couchbase-lite-ios/issues/502

On Thursday, December 31, 2015 at 10:50:12 AM UTC-5, Jordan Wood wrote:
>
> I have been looking at the memory usage of my app, and I discovered this 
> situation:
>
>    1. I reset content and settings in the simulator to see what happens 
>    when someone first opens the app on a new device
>    2. I start the app, and just sit there doing nothing except 
>    replicating a DB with many thousands of small documents that are pulled 
>    from the server
>
> The attached picture shows what I'm seeing in Xcode, which is a pretty 
> impressive, steady increase in memory usage as the DB is pulled from the 
> server.  I ended up at 565 MB.  When the replication stopped, my memory 
> usage stopped increasing.
>
> My logs are showing no activity other than couchbase pull replication 
> activity, and since I am starting with a completely clean and new app, I am 
> pretty confident that I am doing no other processing at this time in the 
> app.
>
> Do you know what could be causing this memory growth, and what next steps 
> would you like me to take?  I can run this in instruments, but I'm a bit of 
> a NOOB when it comes to interpreting the results.
>
> Thanks for the help!
>
> Jordan
>

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