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Nuthatch AgentandChris Kennelly
b9754ee68f
The 48-bit linear congruential generator in ExponentialBiased has short cycles in its low-order bits, so callers must extract the upper 32 bits rather than applying modulo or bitwise operations directly to the stepped state. Returning a plain integer from NextRandom allowed callers to use that raw state by mistake. Wrap the generator state in ExponentialBiased::State, an opaque value type with no arithmetic, bitwise, or comparison operators and no implicit integer conversions. Update the remaining generator callers, including the allocation sampler and the mmap address hint generator, to store the typed state and read random bits through GetRandom. Co-authored-by: Chris Kennelly <ckennelly@google.com> PiperOrigin-RevId: 1007827844
TCMalloc
This repository contains the TCMalloc C++ code.
TCMalloc is Google's customized implementation of C's malloc() and C++'s
operator new used for memory allocation within our C and C++ code. TCMalloc is
a fast, multi-threaded malloc implementation.
Building TCMalloc
Bazel is the official build system for TCMalloc. Experimental support for CMake is available as well.
The TCMalloc Platforms Guide contains information on platform support for TCMalloc.
Documentation
All users of TCMalloc should consult the following documentation resources:
- The TCMalloc Quickstart covers downloading, installing, building, and testing TCMalloc, including incorporating within your codebase.
- The TCMalloc Overview covers the basic architecture of TCMalloc, and how that may affect configuration choices.
- The TCMalloc Reference covers the C and C++ TCMalloc API endpoints.
More advanced usages of TCMalloc may find the following documentation useful:
- The TCMalloc Tuning Guide covers the configuration choices in more depth, and also illustrates other ways to customize TCMalloc. This also covers important operating system-level properties for improving TCMalloc performance.
- The TCMalloc Design Doc covers how TCMalloc works underneath the hood, and why certain design choices were made. Most developers will not need this level of implementation detail.
- The TCMalloc Compatibility Guide which documents our expectations for how our APIs are used.
License
The TCMalloc library is licensed under the terms of the Apache license. See LICENSE for more information.
Disclaimer: This is not an officially supported Google product.