Question 1

rpmalloc vs tcmalloc which is better for multithreaded apps?

Accepted Answer

rpmalloc often outperforms tcmalloc in benchmarks for high-performance multithreaded workloads due to its lock-free thread caching, but tcmalloc might offer more features for general use, so the choice depends on your specific allocation patterns and platform.

Question 2

How to override malloc with rpmalloc in an existing C++ project?

Accepted Answer

Define ENABLE_OVERRIDE to 1 during compilation to include malloc.c, then use LD_PRELOAD on Linux or DYLD_INSERT_LIBRARIES on macOS to inject the library. Ensure you call rpmalloc_initialize or use the dummy linker reference function for proper linking.

Question 3

Does rpmalloc support huge pages on Windows and Linux?

Accepted Answer

Yes, rpmalloc has support for huge pages on Windows, Linux, and macOS. Enable it by passing a non-zero value in the config during initialization with rpmalloc_initialize_config, and it will automatically fall back if unsupported.

Question 4

What is the memory overhead per allocation in rpmalloc?

Accepted Answer

By default, overhead is minimal, but if ENABLE_STATISTICS is enabled, it adds 4 bytes per allocation to track sizes. The README notes that memory overhead is competitive with other allocators like tcmalloc and hoard.

Question 5

Can I use rpmalloc in a Rust project?

Accepted Answer

Yes, there's a Rust wrapper called rpmalloc-rs created by Johan Andersson, which provides bindings for integrating rpmalloc into Rust applications for high-performance memory management.

Question 6

How to enable statistics or safety checks in rpmalloc?

Accepted Answer

Define ENABLE_STATISTICS to 1 for detailed stats with a slight runtime cost, or ENABLE_VALIDATE_ARGS to 1 for integer overflow checks. These are compile-time options set in rpmalloc.c or via command line.

rpmalloc

What is rpmalloc?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions