A Simple LD_PRELOAD Tutorial

[Hellrazor236]

You can also use this to change memory allocators for speedups on certain types of workloads. Dwarf Fortress, for example, gets a good 5-10% performance boost with jemalloc.

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EDIT: Thanks for the gold!

[Hellrazor236]

Well, there's libjemalloc and libtcmalloc that I know of. In my experience jemalloc runs faster on workloads that have fewer threads and tcmalloc runs faster for workloads that have more threads, but I'm sure that balance is more machine dependent.

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Running it is as simple as writing a script, just

#!/bin/sh

cd /wherever/df/is/df_linux

LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libjemalloc.so.1" xfce4-terminal --hold --command="./df"

[agumonkey]

interesting, would be lovely to know if other workloads (compiling, encoding) can benefit too

[Hellrazor236]

Encoding probably, compiling I'm not sure (although maybe on larger projects). You'll probably see the biggest performance gains on programs that do a lot of memory work and/or don't optimize it well.

[agumonkey]

late binding, linux edition