View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0023581 | Community | OCCT:Mesh | public | 2012-11-25 20:31 | 2020-08-28 15:47 |
| Reporter | Roman Lygin | Assigned To | |||
| Priority | normal | Severity | minor | ||
| Status | feedback | Resolution | open | ||
| Platform | A | OS | L | ||
| Product Version | 6.5.4 | ||||
| Target Version | Unscheduled | ||||
| Summary | 0023581: [Regression] Performance of BRepMesh 6.5.4 can be up to Nx worse than 6.3.1 | ||||
| Description | (Like 0023580, inspired by this forum thread - http://www.opencascade.org/org/forum/thread_23944/?add_id=23956&forum=3) Performance of BRepMesh measured on a few medium complexity models can be up to 3x worse vs 6.3.1 | ||||
| Steps To Reproduce | see enclosed readme-performance.txt | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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readme-performance.txt (1,291 bytes) |
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f1_hollow_631.png (461,410 bytes) |
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f1_hollow_654.png (474,296 bytes) |
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f1_shading_631.png (203,912 bytes) |
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f1_shading_654.png (219,844 bytes) |
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Dear Roman, performance regressions couldn't be analyzed in such form. First at all bug description should provide complete information about used models (should be attached to bug, path in OCCT repository, publicity accessible URL, confidential shapes could be provided to bugmaster via e-mail) and test scenarios. I found only one model "F1.brep" (http://www.opencascade.org/showroom/shapegallery/gal5/ "The F1") which seems to be exactly corresponds to shape in report. Second, this is incorrect to calculate time of vdisplay command to compare meshing algorithm. vdisplay calculates deflection parameters by it's own, may use different mesh plugins and involves 3D visualization tasks as well. The more acceptable test case will be: pload MODELING restore F1.brep s tclean s chrono l reset chrono l start incmesh s 15 chrono l stop chrono l show trinfo s pload VISUALIZATION vinit vsetdispmode 1 vdisplay s vaxo vfit vzfit trinfo s Results for OCCT631: > Elapsed time: 0.826 Second(s) > CPU user time: 0.624004 seconds > This shape contains 13982 triangles. > 15723 nodes. > Maximal deflection 14.332640235601703 Results for OCCT654: > Elapsed time: 1.52602131781 Seconds > CPU user time: 1.3260085 seconds > This shape contains 25230 triangles. > 20457 nodes. > Maximal deflection 14.364915117921329 Concerning to F1.brep it is obviously noticeable on attached snapshots that OCCT631 significantly deviate from required deflection whilst OCCT654 produce more acceptable result (but require more triangles and time). |
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Kirill, thanks for a fast turn-around. OK to change the methodology (although the 'vdisplay' is closer to the overall end-user experience). See the updated readme enclosed. The shaver.brep is enclosed, although you can rebuild from the web-site, following the URLs. If you would like to follow up feel free to drop me a personal email. Discussion via Notes here can be not always efficient. We can put a summary afterwards here. thanks. Roman |
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readme-performance2.txt (2,020 bytes) |
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shaver.zip (785,709 bytes) |
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f1.brep (3,719,786 bytes) |
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cylinder_head.brep (4,330,831 bytes) |
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Branch CR23581 has been created by oan. SHA-1: c62618cd602f954b4167ef6e09a16a00ed102cac Detailed log of new commits: Author: oan Date: Mon Mar 4 09:55:25 2019 +0300 0023581: [Regression] Performance of BRepMesh 6.5.4 can be up to Nx worse than 6.3.1 Added test case. |
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Current master gives the following results in seconds comparing to 6.5.4 and 6.3.1: 6.3.1 f1: 0.3125 cylinder_head: 0.46875 shaver: 0.53125 6.5.4 f1: 1.1875 cylinder_head: 1.453125 shaver: 1.546875 7.4.0 f1: 0.53125 cylinder_head: 0.734375 shaver: 0.75 General point of performance degradation was change of triangulation algorithm done in version next to 6.3.1. It is proposed to close the issue now. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2012-11-25 20:31 | Roman Lygin | New Issue | |
| 2012-11-25 20:31 | Roman Lygin | Assigned To | => oan |
| 2012-11-25 20:31 | Roman Lygin | File Added: readme-performance.txt | |
| 2012-11-29 11:23 | kgv | File Added: f1_hollow_631.png | |
| 2012-11-29 11:23 | kgv | File Added: f1_hollow_654.png | |
| 2012-11-29 11:23 | kgv | File Added: f1_shading_631.png | |
| 2012-11-29 11:24 | kgv | File Added: f1_shading_654.png | |
| 2012-11-29 11:45 | kgv | Note Added: 0022438 | |
| 2012-11-29 11:45 | kgv | Assigned To | oan => Roman Lygin |
| 2012-11-29 11:45 | kgv | Status | new => feedback |
| 2012-11-29 23:11 | Roman Lygin | Note Added: 0022464 | |
| 2012-11-29 23:11 | Roman Lygin | Status | feedback => assigned |
| 2012-11-29 23:11 | Roman Lygin | File Added: readme-performance2.txt | |
| 2012-11-29 23:11 | Roman Lygin | File Added: shaver.zip | |
| 2012-11-29 23:12 | Roman Lygin | Assigned To | Roman Lygin => kgv |
| 2012-11-29 23:12 | Roman Lygin | Status | assigned => feedback |
| 2012-12-02 17:54 | kgv | Assigned To | kgv => oan |
| 2012-12-02 17:54 | kgv | Status | feedback => assigned |
| 2013-03-07 15:44 | oan | Relationship added | related to 0023105 |
| 2019-03-12 18:43 | oan | File Added: f1.brep | |
| 2019-03-12 18:43 | oan | File Added: cylinder_head.brep | |
| 2019-03-12 18:55 | git | Note Added: 0082880 | |
| 2019-03-12 18:56 | oan | Note Added: 0082881 | |
| 2019-03-12 18:58 | oan | Note Edited: 0082881 | |
| 2019-03-12 19:00 | oan | Note Edited: 0082881 | |
| 2019-03-12 19:10 | oan | Assigned To | oan => abv |
| 2019-03-12 19:10 | oan | Status | assigned => feedback |
| 2019-04-21 09:22 |
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Target Version | => 7.4.0 |
| 2019-09-06 18:36 |
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Target Version | 7.4.0 => 7.5.0 |
| 2020-08-28 15:47 | oan | Target Version | 7.5.0 => Unscheduled |
