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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Aarch64 memory benchmark performance vs ARMv7"
href="https://llvm.org/bugs/show_bug.cgi?id=28310">28310</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Aarch64 memory benchmark performance vs ARMv7
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: AArch64
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tulipawn@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16635" name="attach_16635" title="Benchmark files, cargo ready">attachment 16635</a> <a href="attachment.cgi?id=16635&action=edit" title="Benchmark files, cargo ready">[details]</a></span>
Benchmark files, cargo ready
Since yesterday, I've been playing with Rust on an `aarch64` Cortex-A53 Android
TV box (2GB RAM, Amlogic S905) that I'd converted to 64-bit Linux.
All's fine and good so far, except for memory benchmark performance, especially
using jemalloc, which is relatively worse compared to ARMv7 (and substantially
worse in absolute terms).
Am I not enabling some erratum perhaps? The native aarch64 binary_trees
benchmark (@23 tree depth) takes:
sysalloc 1m28s 5m10s 0m10s
jemalloc 1m35s 5m10s 0m53s
whereas, the corresponding ARMv7 binaries (running on the same 64-bit system):
sysalloc 1m9s 3m59s 0m19s
jemalloc 1m11s 3m58s 0m25s
@jmolloy I'm aware better performance using 32-bit pointers is probably
expected but what about jemalloc performance drop?
To reproduce, run `cargo build --release && time target/release/binary_trees
23` inside the binary_trees directory. Uncomment the first 2 lines in main.rs
to produce a sysalloc version.</pre>
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