"Day, Timothy" <[email protected]> writes:
>>> For context, Lustre is an open-source (GPLv2) out-of-tree Linux filesystem
>>> commonly used for HPC applications.
>>>
>>> Let me know if you need anymore context. Thanks!
>>
>>Could you check coreutils built with this patch and see if it fixes the
>>performance? I can push it to Gnulib afterwards:
>
> Works perfectly:
>
> $ echo 3 | sudo tee /proc/sys/vm/drop_caches
> 3
> $ time coreutils-9.9-unpatched/src/du /fsx/test_100K > /dev/null
>
> real 1m54.268s
> user 0m0.229s
> sys 0m14.136s
> $ echo 3 | sudo tee /proc/sys/vm/drop_caches
> 3
> $ time coreutils-9.9-patched/src/du /fsx/test_100K > /dev/null
>
> real 0m13.150s
> user 0m0.075s
> sys 0m1.956s
>
> That's around a 9x speedup. I haven't tested any other commands.
> Lustre statahead (which is giving the performance boost) is designed
> for "stat everything in a directory" type workloads. The other commands
> wouldn't do that, I think. Perhaps chown would? Either way, thanks for
> the help!
Great, thanks for your help investigating!
I think 'chown -R' and 'rm -r' would probably be affected as well:
$ mkdir -p dir && (cd dir && mkdir $(seq 10000))
$ strace chown -R collin:collin dir 2>&1 > /dev/null | grep -Fc stat
20022
$ strace rm -r dir 2>&1 > /dev/null | grep -Fc stat
40011
Anyways, I pushed the Gnulib patch and updated the submodule in
coreutils with the attached patch.
Pádraig, I assume this warrants a NEWS entry under "Bug Fixes"?
Collin
>From 3424ae3efa8b487f6327773e6f0554d1bfb33191 Mon Sep 17 00:00:00 2001
Message-ID: <3424ae3efa8b487f6327773e6f0554d1bfb33191.1767329553.git.collin.fu...@gmail.com>
From: Collin Funk <[email protected]>
Date: Thu, 1 Jan 2026 20:43:17 -0800
Subject: [PATCH] build: update gnulib submodule to latest
* bootstrap: Update using './bootstrap --bootstrap-sync'.
* tests/sample-test: Adjust to use the single most recent year.
---
bootstrap | 4 ++--
gnulib | 2 +-
tests/sample-test | 2 +-
3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/bootstrap b/bootstrap
index 29070675b..19f9424bb 100755
--- a/bootstrap
+++ b/bootstrap
@@ -5,7 +5,7 @@
scriptversion=2025-06-10.02; # UTC
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@@ -39,7 +39,7 @@ medir=`dirname "$me"`
scriptlibversion=2025-12-04.19; # UTC
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
diff --git a/gnulib b/gnulib
index 594d98768..8e8991c41 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 594d9876806a796e669d08730dab03b6bfedb29a
+Subproject commit 8e8991c4115ae0274d481144ae6e6c0754642fb4
diff --git a/tests/sample-test b/tests/sample-test
index b9014a850..1a74bbd56 100644
--- a/tests/sample-test
+++ b/tests/sample-test
@@ -1,7 +1,7 @@
#!/bin/sh
# FIXME
-# Copyright (C) 2025-2026 Free Software Foundation, Inc.
+# Copyright (C) 2026 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
--
2.52.0
