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Wed, 17 Sep 2025 16:59:54 -0700 (PDT) MIME-Version: 1.0 References: <20250723-slub-percpu-caches-v5-0-b792cd830f5d@suse.cz> <20250913000935.1021068-1-sudarsanm@google.com> In-Reply-To: From: Suren Baghdasaryan Date: Wed, 17 Sep 2025 16:59:41 -0700 X-Gm-Features: AS18NWBx5aUJDxzgSbTWFT8kC_EPDfnr02N4rctMkVtLm9XJWaAMV1S3L1bSwvY Message-ID: Subject: Re: Benchmarking [PATCH v5 00/14] SLUB percpu sheaves To: Uladzislau Rezki Cc: Vlastimil Babka , paulmck@kernel.org, Jan Engelhardt , Sudarsan Mahendran , Liam.Howlett@oracle.com, cl@gentwo.org, harry.yoo@oracle.com, howlett@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, maple-tree@lists.infradead.org, rcu@vger.kernel.org, rientjes@google.com, roman.gushchin@linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 748EA40005 X-Stat-Signature: qnzqht7oineo77wodimr9mtb9m7nj7ws X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1758153596-540147 X-HE-Meta: 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 WM4F0kG+ vvfUFX8Uk6X6f9+01cAhfhG9m7k/smBCoOMDl+F+S1NiTvyi2h3IcYxt63/EqvlOby1jjYzY+jF6Xdi3vo9d7Kh0QpNoPi+mZsZYWXY7dLKzywPqcMpPYGIP+jYj/rB2WeRNE38TpsIl6qdEA9+PD1n7ea9NGPC54jgyPpFD0JZGIR242UsXskz/yOU1fPjybsDVp/GJsV0vwsh0GnRFxDpbDnSHdSwFsCxThKs1S2k1o9DM1E3aVIjB4sA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Sep 17, 2025 at 9:14=E2=80=AFAM Suren Baghdasaryan wrote: > > On Tue, Sep 16, 2025 at 10:19=E2=80=AFPM Uladzislau Rezki wrote: > > > > On Tue, Sep 16, 2025 at 10:09:18AM -0700, Suren Baghdasaryan wrote: > > > On Mon, Sep 15, 2025 at 8:22=E2=80=AFAM Vlastimil Babka wrote: > > > > > > > > On 9/15/25 14:13, Paul E. McKenney wrote: > > > > > On Mon, Sep 15, 2025 at 09:51:25AM +0200, Jan Engelhardt wrote: > > > > >> > > > > >> On Saturday 2025-09-13 02:09, Sudarsan Mahendran wrote: > > > > >> > > > > > >> >Summary of the results: > > > > > > > > In any case, thanks a lot for the results! > > > > > > > > >> >- Significant change (meaning >10% difference > > > > >> > between base and experiment) on will-it-scale > > > > >> > tests in AMD. > > > > >> > > > > > >> >Summary of AMD will-it-scale test changes: > > > > >> > > > > > >> >Number of runs : 15 > > > > >> >Direction : + is good > > > > >> > > > > >> If STDDEV grows more than mean, there is more jitter, > > > > >> which is not "good". > > > > > > > > > > This is true. On the other hand, the mean grew way more in absol= ute > > > > > terms than did STDDEV. So might this be a reasonable tradeoff? > > > > > > > > Also I'd point out that MIN of TEST is better than MAX of BASE, whi= ch means > > > > there's always an improvement for this config. So jitter here means= it's > > > > changing between better and more better :) and not between worse an= d (more) > > > > better. > > > > > > > > The annoying part of course is that for other configs it's consiste= ntly the > > > > opposite. > > > > > > Hi Vlastimil, > > > I ran my mmap stress test that runs 20000 cycles of mmapping 50 VMAs, > > > faulting them in then unmapping and timing only mmap and munmap calls= . > > > This is not a realistic scenario but works well for A/B comparison. > > > > > > The numbers are below with sheaves showing a clear improvement: > > > > > > Baseline > > > avg stdev > > > mmap 2.621073 0.2525161631 > > > munmap 2.292965 0.008831973052 > > > total 4.914038 0.2572620923 > > > > > > Sheaves > > > avg stdev avg_diff stdev_diff > > > mmap 1.561220667 0.07748897037 -40.44% -69.31% > > > munmap 2.042071 0.03603083448 -10.94% 307.96% > > > total 3.603291667 0.113209047 -26.67% -55.99% > > > > > Could you run your test with dropping below patch? > > Sure, will try later today and report. Sheaves with [04/23] patch reverted: avg avg_diff mmap 2.143948 -18.20% munmap 2.343707 2.21% total 4.487655 -8.68% > > > > > [PATCH v8 04/23] slab: add sheaf support for batching kfree_rcu() opera= tions > > > > mmap()/munmap(), i assume it is a duration time in average, is the time > > in microseconds? > > Yeah, it ends up being in microseconds. The actual reported time is > the total time in seconds that all mmap/munmap in the test consumed. > With 20000 cycles of 50 mmap/munmap calls we end up with 1000000 > syscalls, so the number can be considered as duration in microseconds > for a single call. > > > > > Thank you. > > > > -- > > Uladzislau Rezki