jemalloc Suitable for embedded environments

[Konstantin Tokarev]

07.05.2015, 04:51, "Mayank Kumar (mayankum)" <mayankum at cisco.com>:
> Hi Users
>
> I recently started experimenting with jemalloc and found that jemalloc controls fragmentation phenomenally. A process that was running out of its allocated quota of 2g of virtual memory now uses only 1000mb of virtual memory and works without any crashes. I am trying to incorporate this library but it seems people have some apprehensions about it associated with big data applications(enhanced by facebook).
>
> Can someone answer the following question, while I am trying  to do some code reading:-
>
> 1.       Does jemalloc waste memory at the cost of speed and is optimized for big data applications ?


By default jemalloc uses 4MiB chunks which can be too much for low memory systems. You might want to tune it with lg_chunk option (note that decreasing chunk size may affect performance).


>
> 2.       Are there scenarios where if many threads are competing for malloc, it will dynamically create new arenas to reduce  thread contention and are their parameters to control/tune them ?
>
> 3.       Are there any other tunable parameters I should look at to ensure jemalloc doesn’t uncontrollably allocate memory in stress scenarios to optimize performance at the cost of memory . In my environment, I would expect jemalloc to reduce performance rather than allocate more  memory/arenas/pools to better performance.
>
> Any help is appreciated while I ramp up on this new magical library.
>
> -Mayank
>
> ,
>
> _______________________________________________
> jemalloc-discuss mailing list
> jemalloc-discuss at canonware.com
> http://www.canonware.com/mailman/listinfo/jemalloc-discuss


-- 
Regards,
Konstantin