Mimalloc-bench
Suite for benchmarking malloc implementations, originally developed for benchmarking mimalloc. Collection of various benchmarks from the academic literature, together with automated scripts to pull specific versions of benchmark programs and allocators from Github and build them.
Due to the large variance in programs and allocators, the suite is currently only developed for Unix-like systems, and specifically Ubuntu with apt-get, Fedora with dnf, and macOS (for a limited set of allocators and benchmarks). The only system-installed allocator used is glibc's implementation that ships as part of Linux's libc. All other allocators are downloaded and built as part of build-bench-env.sh -- if you are looking to run these benchmarks on a different Linux distribution look at the setup_packages function to see the packages required to build the full set of allocators.
It is quite easy to add new benchmarks and allocator implementations -- please do so!.
Enjoy, Daan
Note that all the code in the bench directory is not part of mimalloc-bench as such, and all programs in the bench directory are governed under their own specific licenses and copyrights as detailed in their README.md (or license.txt) files. They are just included here for convenience.
Benchmarking
The build-bench-env.sh script with the all argument will automatically pull all needed benchmarks and allocators and build them in the extern directory:
~/dev/mimalloc-bench> ./build-bench-env.sh all
It starts installing packages and you will need to enter the sudo password. All other programs are build in the mimalloc-bench/extern directory. Use ./build-bench-env.sh -h to see all options.
If everything succeeded, you can run the full benchmark suite (from out/bench) as:
~/dev/mimalloc-bench> cd out/bench~/dev/mimalloc-bench/out/bench>../../bench.sh alla allt
Or just test mimalloc and tcmalloc on cfrac and larson with 16 threads:
~/dev/mimalloc-bench/out/bench>../../bench.sh --procs=16 mi tc cfrac larson
Generally, you can specify the allocators (mi, je, tc, hd, sys (system allocator)) etc, and the benchmarks , cfrac, espresso, barnes, lean, larson, alloc-test, cscratch, etc. Or all allocators (alla) and tests (allt). Use --procs=
to set the concurrency, and use --help to see all supported allocators and benchmarks.
Current Allocators
Supported allocators are as follow, see build-bench-env.sh for the versions:
- dieharder: The DieHarder allocator is an error-resistant memory allocator for Windows, Linux, and Mac OS X.
- hd: The Hoard allocator by Emery Berger [1]. This is one of the first multi-thread scalable allocators.
- hm: The Hardened Malloc from GrapheneOS, security-focused.
- iso: The Isoalloc allocator, isolation-based aiming at providing a reasonable level of security without sacrificing too much the performances.
- je: The jemalloc allocator by Jason Evans, now developed at Facebook and widely used in practice, for example in FreeBSD and Firefox.
- mallocng: musl's memory allocator.
- mesh: The mesh allocator, a memory allocator that automatically reduces the memory footprint of C/C++ applications. Also tested as nomesh with the meshing feature disabled.
- mi: The mimalloc allocator. We can also test the debug version as dmi (this can be used to check for any bugs in the benchmarks), and the secure version as smi.
- rp: The rpmalloc allocator uses 16-byte aligned allocations and is developed by Mattias Jansson at Epic Games, used for example in Haiku.
- sc: The scalloc allocator, a fast, multicore-scalable, low-fragmentation memory allocator
- scudo: The scudo allocator used by Fuschia and Android.
- sm: The Supermalloc allocator by Bradley Kuszmaul uses hardware transactional memory to speed up parallel operations.
- sn: The snmalloc allocator is a recent concurrent message passing allocator by Liétar et al. [8].
- sys: The system allocator. Here we usually use the glibc allocator (which is originally based on Ptmalloc2).
- tc: The tcmalloc allocator which comes as part of the Google performance tools and is used in the Chrome browser.
- tbb: The Intel TBB allocator that comes with the Thread Building Blocks (TBB) library [7].
Current Benchmarks
The first set of benchmarks are real world programs, or are trying to mimic some, and consists of:
- barnes: a hierarchical n-body particle solver [4], simulating the gravitational forces between 163840 particles. It uses relatively few allocations compared to
cfracandespressobut is multithreaded. - cfrac: by Dave Barrett, implementation of continued fraction factorization, using many small short-lived allocations.
- espresso: a programmable logic array analyzer, described by Grunwald, Zorn, and Henderson [3]. in the context of cache aware memory allocation.
- gs: have ghostscript process the entire Intel Software Developer’s Manual PDF, which is around 5000 pages.
- leanN: The Lean compiler by de Moura et al, version 3.4.1, compiling its own standard library concurrently using N threads (
./lean --make -j N). Big real-world workload with intensive allocations. - redis: running redis-benchmark, with 1 million requests pushing 10 new list elements and then requesting the head 10 elements, and measures the requests handled per second. Simulates a real-world workload.
- larsonN: by Larson and Krishnan [2]. Simulates a server workload using 100 separate threads which each allocate and free many objects but leave some objects to be freed by other threads. Larson and Krishnan observe this behavior (which they call bleeding) in actual server applications, and the benchmark simulates this.
- larsonN-sized: same as the larsonN except it uses sized deallocation calls which have a fast path in some allocators.
- z3: perform some computations in z3.
The second set of benchmarks are stress tests and consist of:
- alloc-test: a modern allocator test developed by OLogN Technologies AG (ITHare.com) Simulates intensive allocation workloads with a Pareto size distribution. The alloc-testN benchmark runs on N cores doing 100·10⁶ allocations per thread with objects up to 1KiB in size. Using commit
94f6cb(master, 2018-07-04) - cache-scratch: by Emery Berger [1]. Introduced with the Hoard allocator to test for passive-false sharing of cache lines: first some small objects are allocated and given to each thread; the threads free that object and allocate immediately another one, and access that repeatedly. If an allocator allocates objects from different threads close to each other this will lead to cache-line contention.
- cache_trash: part of Hoard benchmarking suite, designed to exercise heap cache locality.
- glibc-simple and glibc-thread: benchmarks for the glibc.
- malloc-large: part of mimalloc benchmarking suite, designed to exercice large (several MiB) allocations.
- mleak: check that terminate threads don't "leak" memory.
- rptest: modified version of the rpmalloc-benchmark suite.
- mstress: simulates real-world server-like allocation patterns, using N threads with with allocations in powers of 2
where objects can migrate between threads and some have long life times. Not all threads have equal workloads and after each phase all threads are destroyed and new threads created where some objects survive between phases. - rbstress: modified version of allocator_bench, allocates chunks in memory via ruby shenanigans.
- sh6bench: by MicroQuill as part of SmartHeap. Stress test where some of the objects are freed in a usual last-allocated, first-freed (LIFO) order, but others are freed in reverse order. Using the public source (retrieved 2019-01-02)
- sh8benchN: by MicroQuill as part of SmartHeap. Stress test for multi-threaded allocation (with N threads) where, just as in larson, some objects are freed by other threads, and some objects freed in reverse (as in sh6bench). Using the public source (retrieved 2019-01-02)
- xmalloc-testN: by Lever and Boreham [5] and Christian Eder. We use the updated version from the SuperMalloc repository. This is a more extreme version of the larson benchmark with 100 purely allocating threads, and 100 purely deallocating threads with objects of various sizes migrating between them. This asymmetric producer/consumer pattern is usually difficult to handle by allocators with thread-local caches.
Example
Below is an example (Apr 2019) of the benchmark results on an HP Z4-G4 workstation with a 4-core Intel® Xeon® W2123 at 3.6 GHz with 16GB ECC memory, running Ubuntu 18.04.1 with LibC 2.27 and GCC 7.3.0.
Memory usage:
(note: the xmalloc-testN memory usage should be disregarded is it allocates more the faster the program runs. Unfortunately, there are no entries for SuperMalloc in the leanN and xmalloc-testN benchmarks as it faulted on those)
Resulting improvements
- Minor performances improvement in isoalloc
- A crash in isoalloc
- Caught a compilation issue in rpmalloc
References
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[1] Emery D. Berger, Kathryn S. McKinley, Robert D. Blumofe, and Paul R. Wilson. Hoard: A Scalable Memory Allocator for Multithreaded Applications the Ninth International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS-IX). Cambridge, MA, November 2000. pdf
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[2] P. Larson and M. Krishnan. Memory allocation for long-running server applications. In ISMM, Vancouver, B.C., Canada, 1998. pdf
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[3] D. Grunwald, B. Zorn, and R. Henderson. Improving the cache locality of memory allocation. In R. Cartwright, editor, Proceedings of the Conference on Programming Language Design and Implementation, pages 177–186, New York, NY, USA, June 1993. pdf
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[4] J. Barnes and P. Hut. A hierarchical O(n*log(n)) force-calculation algorithm. Nature, 324:446-449, 1986.
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[5] C. Lever, and D. Boreham. Malloc() Performance in a Multithreaded Linux Environment. In USENIX Annual Technical Conference, Freenix Session. San Diego, CA. Jun. 2000. Available at https://github.com/kuszmaul/SuperMalloc/tree/master/tests
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[6] Timothy Crundal. Reducing Active-False Sharing in TCMalloc. 2016. http://courses.cecs.anu.edu.au/courses/CSPROJECTS/16S1/Reports/Timothy*Crundal*Report.pdf. CS16S1 project at the Australian National University.
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[7] Alexey Kukanov, and Michael J Voss. The Foundations for Scalable Multi-Core Software in Intel Threading Building Blocks. Intel Technology Journal 11 (4). 2007
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[8] Paul Liétar, Theodore Butler, Sylvan Clebsch, Sophia Drossopoulou, Juliana Franco, Matthew J Parkinson, Alex Shamis, Christoph M Wintersteiger, and David Chisnall. Snmalloc: A Message Passing Allocator. In Proceedings of the 2019 ACM SIGPLAN International Symposium on Memory Management, 122–135. ACM. 2019.
![new[] and delete in Larson.cpp](https://avatars.githubusercontent.com/u/270363?v=4)
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