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On 12 August 2017 at 15:10, luke-tierney at uiowa.edu wrote:
| As the Python posts poitns out, it is possible to use alternate malloc
| implementations, either rebuilding R to use them or using LD_PRELOAD.
| On Ubuntu for example, you can have R use jemalloc with
| 
| sudo apt-get install libjemalloc1
| env LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.1 R
| 
| This does not seem to hold onto memory to the same degree, but I don't
| know about any other aspect of its performance.

Interesting.

I don't really know anything about malloc versus jemalloc internals but I
can affirm that redis -- an in-memory database written in single-threaded C
for high performance -- in its Debian builds has been using jemalloc for
years, presumably by choice of the maintainer. (We are very happy users of
[a gently patched] redis at work; lots of writes; very good uptime.)

Having the ability to switch to jemalloc, we could design a test bench and
compare what the impact is.

Similarly, if someone cared, I could (presumably) alter the default R build
for Debian and Ubunto to also switch to jemalloc.

Anybody feel like doing some empirics?

Dirk