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gens

How about fragmentation ?

AFAIK jemalloc is horrible when it comes to memory usage.

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What makes you say that? jemalloc's fragmentation is very low [1].

[1]: https://blog.pavlov.net/2007/12/04/vlad-and-analysis-of-dtra...

The pictures there are missing (i get error 400 when i try to download them directly).

After 10min of googleing i found this [0] (it shows swap), and this [1] from 2012.

Nothing conclusive, especially considering that all the popular malloc-s can be tuned.

[0] https://suniphrase.wordpress.com/2015/10/27/jemalloc-vs-tcma... [1] https://juliank.wordpress.com/2012/05/31/memory-allocators/

As a bonus, i found a phrack article on jemalloc. http://phrack.org/issues/68/10.html#article

My use of jemalloc in multithreaded servers shows the opposite to be true. Memory use is a little higher than the single mutex dlmalloc, but you'd expect this with a modern high performance thread aware malloc implementation. You think MariaDB would choose jemalloc if it wasn't efficient in memory use?

>> You think MariaDB would choose jemalloc if it wasn't efficient in memory use?

I don't think this is a smart way of choosing an allocator.

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