README

This is a just a test project that can be used to stress test and benchmark different memory managers.

Please note that the results of these tests are NOT the final verdict over which memory manager is best.

What is best depends completely on your own code, so make sure to test many memory managers under different conditions.

In this app there are two modes: You can run it without locks or with threads sharing a common TCriticalSection, which is used a lot.

Interestingly, FastMM with its default settings is by far slowest when run with no locks but it's the fastest when the lock is used.

To switch between memory managers, uncomment the one you want to test in MemSpeedTest.dpr If you use FastMM, also check the project's conditional defines.

Related discussion: https://www.facebook.com/groups/137012246341854/permalink/1991744470868613

Some sample results:

Delphi default

Running with 4 threads

Mean time per thread: 00.09.602

Running with 4 threads with locks

Mean time per thread: 00.10.859

Running with 8 threads

Mean time per thread: 00.09.320

Running with 8 threads with locks

Mean time per thread: 00.10.634

Memory usage 1.5 -> 3,4 MB

FastMM - Never

Running with 4 threads

Mean time per thread: 00.05.959

Running with 4 threads with locks

Mean time per thread: 00.18.154

Running with 8 threads

Mean time per thread: 00.05.301

Running with 8 threads with locks

Mean time per thread: 00.28.555

Memory usage 1.5 -> 3.4 MB

FastMM - Never & Switch

Running with 4 threads

Mean time per thread: 00.06.855

Running with 4 threads with locks

Mean time per thread: 00.18.283

Running with 8 threads

Mean time per thread: 00.06.576

Running with 8 threads with locks

Mean time per thread: 00.30.712

Memory usage 1.5 -> 3.5 MB

BrainMM

Running with 4 threads

Mean time per thread: 00.04.284

Running with 4 threads with locks

Mean time per thread: 00.18.994

Running with 8 threads

Mean time per thread: 00.03.764

Running with 8 threads with locks

Mean time per thread: 00.28.601

Memory usage 1.5 -> 5.6 MB

ScaleMM

Running with 4 threads

Mean time per thread: 00.04.327

Running with 4 threads with locks

Mean time per thread: 00.19.586

Running with 8 threads

Mean time per thread: 00.03.749

Running with 8 threads with locks

Mean time per thread: 00.29.568

Memory usage 1.5 -> 14.5 MB

tcmalloc

Running with 4 threads

Mean time per thread: 00.04.847

Running with 4 threads with locks

Mean time per thread: 00.22.755

Running with 8 threads

Mean time per thread: 00.03.881

Running with 8 threads with locks

Mean time per thread: 00.33.090

Memory usage 2.2 -> 11.9 MB

Memory usage tests with lots of threads:

FastMM

Running with 40 threads

Mean time per thread: 00.08.896

-> 3.5 MB

ScaleMM

Running with 40 threads

Mean time per thread: 00.03.535

-> 48.9 MB

BrainMM

Running with 40 threads

Mean time per thread: 00.03.491

-> 5.7 MB

tcmalloc

Running with 40 threads

Mean time per thread: 00.03.259

-> 35.9 MB