0032006: Foundation Classes - OSD_MemInfo returns negative heap value

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0032006

Open CASCADE

[OCCT] OCCT:Foundation Classes

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2020-12-17 22:25

2020-12-17 22:26

Reporter

kgv

Assigned To

abv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

[OCCT] 6.6.0

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0032006: Foundation Classes - OSD_MemInfo returns negative heap value

Description

OSD_MemInfo returns negative values for MemHeapUsage counter on Linux when exceeding 2GB:

Draw[10]>   Private memory:     6011 MiB
  Working Set:        6054 MiB (peak: 6108 MiB)
  Virtual memory:     6297 MiB
  Heap memory:     -362 MiB

This is because implementation relies on obsolete GLibc-specific function mallinfo() returning 32-bit signed integer numbers.

Apart from overflow, mallinfo::uordblks is also known to return counter only for a first arena, while several arenas might be allocated - hence, unreliable for computing overall private allocations.

Unfortunately, there is no mallinfo() alternative compatible with 64-bit address space.
Instead, there are other functions available like malloc_info() returning memory info in an XML form.

       int malloc_info(int options, FILE *stream);

Some applications implement an XML parser (with help of open_memstream() for creation of in-memory file).
While this could be slower than mallinfo() call, it seems this is the only way for computing reliable Heap values.

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0023818

closed

omy

Extend OSD_MemInfo to report C heap statistics

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Issue History
Date Modified	Username	Field	Change
2020-12-17 22:25	kgv	New Issue
2020-12-17 22:25	kgv	Assigned To	=> abv
2020-12-17 22:26	kgv	Relationship added	child of 0023818
2020-12-17 22:26	kgv	Product Version	7.5.0 => 6.6.0