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Oct 11, 2024
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review glibc with LSE Learning Path #1313

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11 changes: 11 additions & 0 deletions ...arning-paths/servers-and-cloud-computing/glibc-with-lse/build_glibc_with_lse.md
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Expand Up @@ -16,6 +16,17 @@ LSE introduces additional atomic instructions and operations, such as Load-Acqui

When glibc is compiled with LSE support, it can take advantage of these enhanced atomic operations provided by the LSE extension. This can potentially improve the performance of multi-threaded applications that heavily rely on atomic operations and synchronization primitives.

{{% notice Note %}}
Your version of the GNU C Library may already have support for LSE. Before you build a new version check if LSE is already included by running:

```console
objdump -d /lib/aarch64-linux-gnu/libc.so.6 | grep -i 'cas\|casp\|swp\|ldadd\|stadd\|ldclr\|stclr\|ldeor\|steor\|ldset\|stset\|ldsmax\|stsmax\|ldsmin\|stsmin\|ldumax\|stumin' | wc -l
```

If a non-zero number is printed your GNU C Library already has LSE.

{{% /notice %}}

## Before you begin

Launch an [Arm based instance](/learning-paths/servers-and-cloud-computing/csp/) running Ubuntu version 20.04.
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