View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0032014 | Open CASCADE | OCCT:Data Exchange | public | 2020-12-22 11:20 | 2021-10-07 14:57 |
| Reporter | kgv | Assigned To | gka | ||
| Priority | normal | Severity | just a question | ||
| Status | new | Resolution | open | ||
| Platform | Windows | OS | VC++ 2015 | ||
| Product Version | 7.5.0 | ||||
| Target Version | 7.7.0 | ||||
| Summary | 0032014: Data Exchange - large STEP file is read 2-3 times slower on msvc14 than on GCC and CLang | ||||
| Description | Reading a large 1GB STEP file shows enormous difference in time on different platforms (Windows 10 (msvc14), Ubuntu 18.04 (gcc7.5), macOS 10.14 (CLang11)):|===========================================| | | AMD Ryzen 3900X | Intel Core i5 | |---------|-----------------|---------------| | msvc14 | 19:13 | 16:30 | | gcc7.5 | 06:13 | 14:54 | | CLang11 | N/A | 07:31 | |===========================================| gcc7.5 is 3x times faster than msvc14 on Ryzen 3900X (but not that much on Intel Core i5) and CLang11 is 2x times faster than gcc7.5 and msvc14 on Intel Core i5. Such a large difference (and extremely long STEP import time in case of msvc14 outsider) looks suspicious. It is proposed to: - Collect more data samples to verify if deviation is general or specific to one / few STEP files. - Collect more statistics, including Visual Studio 2019, GCC 10 and CLang (Linux/Windows) to determine if difference is caused only by compiler or also by platform (dubious). - Localize hot-spots in the algorithm showing most noticeable performance deviations and analyze options which would reduce the difference. | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
