For the general case? No. Varnish retained it's mmap backend so you could still chose to use it if you have a load that required it.
For the general case, where writes are somewhat frequent and the dataset is pretty small the malloc backend was a lot more performant, once we figured out the the default implementation of malloc in Glibc was pretty shit (wrt overhead).
For the general case, where writes are somewhat frequent and the dataset is pretty small the malloc backend was a lot more performant, once we figured out the the default implementation of malloc in Glibc was pretty shit (wrt overhead).