Large rails apps can see significant improvement in memory use efficiency with jemalloc e.g. as in https://www.levups.com/en/blog/2017/optimize_ruby_memory_usag

Large rails apps can see significant improvement in memory use efficiency with jemalloc e.g. as in https://www.levups.com/en/blog/2017/optimize_ruby_memory_usage_jemalloc_heroku_scalingo.html https://www.levups.com/en/blog/2017/optimize_ruby_memory_usa... However I’ve also seen an improvement from simply setting MALLOC_ARENA_MAX=2.