Is jemalloc better or worse than nedmalloc?
Good question! There are many similarities between the designs, and like nedmalloc jemalloc keeps changing its internals over time so whatever I say here is likely out of date! Last time I looked, jemalloc uses red-black trees internally which are considerably slower than binary bitwise trees. On the other hand, jemalloc has the big advantage of a fully integrated threadcache whereas nedmalloc’s is literally bolted on on top of dlmalloc and its lack of integration does cost a few percent of performance (but eases my maintenance). jemalloc allocates small blocks more tightly and therefore wastes less memory, but this can introduce cache line sloshing when multiple CPU cores are writing to the same cache line. jemalloc is generally developed on Linux and Mac OS X first and Windows after, whereas I’d target Windows first due to its popularity and the others after. nedmalloc definitely is more experimental with C1X N1527 support (though I’d love if Jason added this too – hint hint!). In sh
