0028203: Coding rules - check testing with MMGT_CLEAR turned OFF

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0028203

Open CASCADE

[OCCT] OCCT:Coding

public

2016-12-08 19:01

2020-08-28 16:35

Reporter

kgv

Assigned To

kgv

Priority

normal

Severity

integration request

Status

new

Resolution

open

Platform

OS Version

Product Version

[OCCT] 7.1.0

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0028203: Coding rules - check testing with MMGT_CLEAR turned OFF

Description

For the moment, the option MMGT_CLEAR is turned ON by both - default environment scripts and within Standard.cxx itself:

  aVar = getenv ("MMGT_CLEAR");
  Standard_Boolean toClear     = (aVar ? (atoi (aVar) != 0) : Standard_True);

This option is intended to clear (fill with zeros) memory blocks allocated by standard OCCT allocators (e.g. Standard::Allocate()).

This practice, however, has side effects:
- It might hide possible issues in OCCT algorithms due to usage of uninitialized memory.
- Zeroing memory increases time required for memory allocation.

Therefore, it is proposed to perform regression testing of OCCT with MMGT_CLEAR turned OFF (set "MMGT_CLEAR=0") and collect information about current state (e.g. if there some regressions / the performance difference).

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Relationships

parent of	0029769	closed	abv	Community	Foundation Classes - Uninitialized data with BSplCLib_Cache, BSplSLib_Cache
related to	0029944	closed	bugmaster	Open CASCADE	Porting to Debian80 64 bit : Regressions on the gcc (Debian 4.9.2-10) 4.9.2. Exception is raised during load STEP file
related to	0031035	verified	bugmaster	Open CASCADE	Coding - uninitialized class fields reported by Visual Studio Code Analysis

Notes
(0061516) kgv (developer) 2016-12-08 23:31	Total cases: 276 BAD, 10064 FAILED, 4 IMPROVEMENT, 8619 OK, 7 SKIPPED Elapsed time: 1 Hours 45 Minutes 5.92951765563 Seconds

Issue History
Date Modified	Username	Field	Change
2016-12-08 19:01	kgv	New Issue
2016-12-08 19:01	kgv	Assigned To	=> kgv
2016-12-08 23:31	kgv	Note Added: 0061516
2017-07-20 11:41	kgv	Target Version	7.2.0 => 7.3.0
2018-02-25 21:04	abv	Target Version	7.3.0 => 7.4.0
2018-06-13 10:11	kgv	Relationship added	parent of 0029769
2018-07-10 21:21	kgv	Relationship added	related to 0029944
2019-07-10 19:27	abv	Target Version	7.4.0 => 7.5.0
2019-11-22 17:33	kgv	Relationship added	related to 0031035
2020-08-28 16:35	kgv	Target Version	7.5.0 => 7.6.0*