ctx_clock

Ctx_clock is a simple test program to measure the context switch time in clock cycles.

To run this test with the Phoronix Test Suite, the basic command is: phoronix-test-suite benchmark ctx-clock.

Project Site

gist.github.com

Test Created

18 February 2019

Test Maintainer

Michael Larabel 

Test Type

System

Average Install Time

2 Seconds

Average Run Time

30 Seconds

Test Dependencies

C/C++ Compiler Toolchain

Accolades

20k+ Downloads

Supported Platforms


Public Result Uploads *Reported Installs **Reported Test Completions **Test Profile Page Views ***OpenBenchmarking.orgEventsctx_clock Popularity Statisticspts/ctx-clock2019.022019.042019.062019.082019.102019.122020.022020.042020.062020.082020.102020.122021.022021.042021.062021.082021.102021.122022.022022.042022.062022.082022.104K8K12K16K20K
* Uploading of benchmark result data to OpenBenchmarking.org is always optional (opt-in) via the Phoronix Test Suite for users wishing to share their results publicly.
** Data based on those opting to upload their test results to OpenBenchmarking.org and users enabling the opt-in anonymous statistics reporting while running benchmarks from an Internet-connected platform.
*** Test profile page view reporting began March 2021.
Data current as of 26 November 2022.

Revision History

pts/ctx-clock-1.0.0   [View Source]   Mon, 18 Feb 2019 12:05:15 GMT
Initial commit of basic test that measures the context switch time.

Suites Using This Test

Common Kernel Benchmarks

CPU Massive

Server CPU Tests


Performance Metrics

Analyze Test Configuration:

ctx_clock

Context Switch Time

OpenBenchmarking.org metrics for this test profile configuration based on 4,138 public results since 18 February 2019 with the latest data as of 29 November 2022.

Below is an overview of the generalized performance for components where there is sufficient statistically significant data based upon user-uploaded results. It is important to keep in mind particularly in the Linux/open-source space there can be vastly different OS configurations, with this overview intended to offer just general guidance as to the performance expectations.

Component
Percentile Rank
# Compatible Public Results
Clocks (Average)
100th
3
68 +/- 2
100th
20
81 +/- 2
99th
4
88 +/- 12
99th
37
92 +/- 10
98th
3
104 +/- 15
97th
5
105 +/- 13
97th
7
112 +/- 10
96th
3
117 +/- 6
96th
6
119 +/- 11
93rd
8
122 +/- 4
92nd
43
128 +/- 17
91st
18
130 +/- 7
89th
3
134 +/- 1
88th
10
135 +/- 3
85th
3
137 +/- 4
84th
19
139 +/- 1
84th
3
140 +/- 6
82nd
6
143 +/- 1
82nd
9
144 +/- 12
79th
7
147 +/- 4
76th
28
149 +/- 4
76th
24
150 +/- 4
Mid-Tier
75th
> 150
72nd
5
153 +/- 7
72nd
5
153 +/- 4
71st
21
155 +/- 15
71st
8
155 +/- 2
70th
6
157 +/- 9
70th
23
157 +/- 9
69th
3
158 +/- 2
69th
5
160 +/- 3
66th
23
166 +/- 20
66th
15
166 +/- 23
66th
5
167 +/- 4
64th
9
169 +/- 2
63rd
3
174 +/- 1
63rd
13
174 +/- 5
62nd
7
175 +/- 18
61st
8
176 +/- 3
61st
5
178 +/- 4
60th
4
180 +/- 13
57th
11
183 +/- 18
57th
9
184 +/- 9
57th
8
184 +/- 15
54th
4
189 +/- 6
54th
3
189 +/- 12
54th
5
190 +/- 23
53rd
15
191 +/- 28
52nd
18
194 +/- 25
52nd
8
194 +/- 19
52nd
11
196 +/- 1
51st
8
198 +/- 15
Median
50th
200
50th
3
201 +/- 1
50th
3
202 +/- 28
50th
8
203 +/- 1
49th
5
206 +/- 5
49th
14
208 +/- 15
48th
3
216 +/- 8
39th
4
358 +/- 1
34th
3
482 +/- 1
30th
11
561 +/- 31
Low-Tier
25th
> 629
24th
4
645 +/- 58
24th
3
658 +/- 65
21st
4
734 +/- 60
21st
3
738 +/- 30
20th
6
770 +/- 10
18th
4
864 +/- 83
17th
3
917 +/- 8
15th
4
968 +/- 4
11th
4
1079 +/- 32
10th
11
1093 +/- 30
9th
4
1108 +/- 60
8th
14
1130 +/- 135
8th
4
1136 +/- 38
7th
3
1167 +/- 83
7th
3
1168 +/- 51
5th
3
1223 +/- 73
3rd
5
1372 +/- 59
OpenBenchmarking.orgDistribution Of Public Results - Context Switch Time4135 Results Range From 64 To 28197 Clocks6462711901753231628793442400545685131569462576820738379468509907296351019810761113241188712450130131357614139147021526515828163911695417517180801864319206197692033220895214582202122584231472371024273248362539925962265252708827651282147001400210028003500

Based on OpenBenchmarking.org data, the selected test / test configuration (ctx_clock - Context Switch Time) has an average run-time of 2 minutes. By default this test profile is set to run at least 3 times but may increase if the standard deviation exceeds pre-defined defaults or other calculations deem additional runs necessary for greater statistical accuracy of the result.

OpenBenchmarking.orgMinutesTime Required To Complete BenchmarkContext Switch TimeRun-Time246810Min: 1 / Avg: 1 / Max: 3

Based on public OpenBenchmarking.org results, the selected test / test configuration has an average standard deviation of 0.2%.

OpenBenchmarking.orgPercent, Fewer Is BetterAverage Deviation Between RunsContext Switch TimeDeviation246810Min: 0 / Avg: 0.2 / Max: 4

Does It Scale Well With Increasing Cores?

No, based on the automated analysis of the collected public benchmark data, this test / test settings does not generally scale well with increasing CPU core counts. Data based on publicly available results for this test / test settings, separated by vendor, result divided by the reference CPU clock speed, grouped by matching physical CPU core count, and normalized against the smallest core count tested from each vendor for each CPU having a sufficient number of test samples and statistically significant data.

IntelAMDOpenBenchmarking.orgRelative Core Scaling To Basectx_clock CPU Core ScalingContext Switch Time2468101618243248641280.74381.48762.23142.97523.719

Notable Instruction Set Usage

Notable instruction set extensions supported by this test, based on an automatic analysis by the Phoronix Test Suite / OpenBenchmarking.org analytics engine.

Instruction Set
Support
Instructions Detected
Last automated analysis: 17 January 2022

This test profile binary relies on the shared libraries libc.so.6.

Tested CPU Architectures

This benchmark has been successfully tested on the below mentioned architectures. The CPU architectures listed is where successful OpenBenchmarking.org result uploads occurred, namely for helping to determine if a given test is compatible with various alternative CPU architectures.

CPU Architecture
Kernel Identifier
Verified On
Intel / AMD x86 64-bit
x86_64
(Many Processors)
Intel / AMD x86 32-bit
i686
(Many Processors)

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