linux-kernel - Re: [PATCH v11 19/19] futex: Allow to make the private hash immutable.

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Message-ID: <20250410105628.cLaq6gVO@linutronix.de>
Date: Thu, 10 Apr 2025 12:56:28 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v11 19/19] futex: Allow to make the private hash
 immutable.

On 2025-04-07 17:57:42 [+0200], To linux-kernel@...r.kernel.org wrote:
> - Xeon CPU E5-2650, 2 NUMA nodes, total 32 CPUs:
>   - Before the introducing task local hash
>     shared  Averaged 1.487.148 operations/sec (+- 0,53%), total secs = 10
>     private Averaged 2.192.405 operations/sec (+- 0,07%), total secs = 10
> 
>   - With the series
>     shared  Averaged 1.326.342 operations/sec (+- 0,41%), total secs = 10
>     -b128   Averaged   141.394 operations/sec (+- 1,15%), total secs = 10
>     -Ib128  Averaged   851.490 operations/sec (+- 0,67%), total secs = 10
>     -b8192  Averaged   131.321 operations/sec (+- 2,13%), total secs = 10
>     -Ib8192 Averaged 1.923.077 operations/sec (+- 0,61%), total secs = 10
>     128 is the default allocation of hash buckets.
>     8192 was the previous amount of allocated hash buckets.
> 
> - Xeon(R) CPU E7-8890 v3, 4 NUMA nodes, total 144 CPUs:
>   - Before the introducing task local hash
>     shared   Averaged 1.810.936 operations/sec (+- 0,26%), total secs = 20
>     private  Averaged 2.505.801 operations/sec (+- 0,05%), total secs = 20
> 
>   - With the series
>     shared   Averaged 1.589.002 operations/sec (+- 0,25%), total secs = 20
>     -b1024   Averaged    42.410 operations/sec (+- 0,20%), total secs = 20
>     -Ib1024  Averaged   740.638 operations/sec (+- 1,51%), total secs = 20
>     -b65536  Averaged    48.811 operations/sec (+- 1,35%), total secs = 20
>     -Ib65536 Averaged 1.963.165 operations/sec (+- 0,18%), total secs = 20
>     1024 is the default allocation of hash buckets.
>     65536 was the previous amount of allocated hash buckets.

On EPYC 7713, 2 NUMA nodes, 256 CPUs:
				ops/sec		buckets
 -t 250                     25.393 (+- 1,51%)     1024
 -t 250 -b 1024 -I       1.645.327 (+- 0,34%)     1024
 -t 250 -b 65536            25.445 (+- 2,41%)    65536
 -t 250 -b 65536 -I      1.733.745 (+- 0,36%)    65536
 -t 250 -b 0             1.745.242 (+- 0,21%)    32768 * 2

Sebastian