Back on the 12th of February we turned jemalloc on in our Linux builds. Sorry for not posting sooner! We saw a good performance increase and a drop in memory. Neither were as large as the wins we saw on Windows but still good. I tried tuning the glibc allocator a bit but was mostly unsuccessful at making it both faster and use less memory at the same time. Also over time the fragmentation results just weren’t quite what we were hoping for.
Things in the memory world are looking pretty great. Our work seemed to have paid off. There is always more to do but Firefox 3 beta 4 will be great.