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Jemalloc warnings in Readme (#448)

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Jakub Nabaglo 2022-01-24 13:35:26 -08:00 committed by GitHub
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@ -30,6 +30,13 @@ RUST_LOG=debug RUSTFLAGS=-Ctarget-cpu=native cargo test --release test_recursive
```
## Jemalloc
By default, Plonky2 uses the [Jemalloc](http://jemalloc.net) memory allocator due to its superior performance. Currently, it changes the default allocator of any binary to which it is linked. You can disable this behavior by removing the corresponding lines in [`plonky2/src/lib.rs`](https://github.com/mir-protocol/plonky2/blob/main/plonky2/src/lib.rs).
Jemalloc is known to cause crashes when a binary compiled for x86 is run on an Apple silicon-based Mac under [Rosetta 2](https://support.apple.com/en-us/HT211861). If you are experiencing crashes on your Apple silicon Mac, run `rustc --print target-libdir`. The output should contain `aarch64-apple-darwin`. If the output contains `x86_64-apple-darwin`, then you are running the Rust toolchain for x86; we recommend switching to the native ARM version.
## Copyright
Plonky2 was developed by Polygon Zero (formerly Mir). While we plan to adopt an open source license, we haven't selected one yet, so all rights are reserved for the time being. Please reach out to us if you have thoughts on licensing.