[OmniOS-discuss] ILB memory leak?

[Bob Friesenhahn]

On Fri, 6 Nov 2015, Dan McDonald wrote:
>
> More huge anonymous mappings (1G, 512MB, 256MB, 128MB).
>
> I don't know pmap as well as I should.  I don't see anything in the 
> man page to give me further insight into why these chunks of memory 
> are being eaten.

It is pretty common for memory allocators to use anonymous mappings 
for large memory allocations.  This allows releasing memory back to 
the system.

Some applications use algorithms where they double the memory size 
request from the previous request when a little more memory is 
required in order to lessen the hit from many realloc() calls.  This 
might explain the power-of two sizes.  If this is being done, the 
smaller power of two allocations may be a bug.

Tracing mmap() calls on the program while is is running might reveal 
something.

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/