4 ms·

How about fragmentation ? AFAIK jemalloc is horrible when it comes to memory usage.

• mallaco 10y ago
  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?
  • biocomputation 10y ago
    >> 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.
• pcwalton 10y ago
  What makes you say that? jemalloc's fragmentation is very low [1]. [1]: https://blog.pavlov.net/2007/12/04/vlad-and-analysis-of-dtrace-was-used/ https://blog.pavlov.net/2007/12/04/vlad-and-analysis-of-dtra...
  • gens 10y ago
    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-tcmalloc-vs-dlmalloc/ https://suniphrase.wordpress.com/2015/10/27/jemalloc-vs-tcma... [1] https://juliank.wordpress.com/2012/05/31/memory-allocators/ 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 http://phrack.org/issues/68/10.html#article