0000776: FIXED: memory leak in the heavily threaded code utilizing Intel MKL

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000776

[ALGLIB] General

minor

have not tried

2017-12-24 13:19

2018-05-08 12:33

Reporter

SergeyB

View Status

public

Assigned To

SergeyB

Priority

normal

Resolution

fixed

Platform

Status

resolved

Projection

none

OS Version

ETA

none

Fixed in Version

3.14.0

Product Version

Target Version

3.14.0

Product Build

Summary

0000776: FIXED: memory leak in the heavily threaded code utilizing Intel MKL

Description

=== Problem description ===

Intel MKL in its default configuration allocates thread-local buffer storage which is used to accelerate computations (create aligned copies of data). The problem is that this buffer is not deallocated after exit from MKL - just for the case same thread will call MKL one more time.

When application spawns many threads, it results in creation of multiple thread-local buffers; when many threads are spawned constantly (as it happens with some threading frameworks, including NET Task Parallel Library) it results in steadily growing memory consumption.

To be exact, memory is not actually lost - it can be freed with just one call of mkl_free_buffers(). However, such behavior is still undesirable.

=== Solution ==

A watchdog thread starts on MKL startup which performs periodic (once in a few seconds) cleanup of unused buffers.

Steps To Reproduce

Additional Information

Programming language

Unspecified

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Issue History
Date Modified	Username	Field	Change
2017-12-24 13:19	SergeyB	New Issue
2017-12-24 13:19	SergeyB	Status	new => assigned
2017-12-24 13:19	SergeyB	Assigned To	=> SergeyB
2017-12-24 13:19	SergeyB	Programming language	=> Unspecified
2017-12-24 13:19	SergeyB	Status	assigned => resolved
2017-12-24 13:19	SergeyB	Fixed in Version	=> 3.13.0
2017-12-24 13:19	SergeyB	Resolution	open => fixed
2018-04-03 14:01	SergeyB	Status	resolved => assigned
2018-04-03 14:02	SergeyB	Resolution	fixed => open
2018-04-03 14:02	SergeyB	Fixed in Version	3.13.0 =>
2018-04-03 14:02	SergeyB	Target Version	3.13.0 => 3.14.0
2018-05-08 12:32	SergeyB	Description Updated
2018-05-08 12:33	SergeyB	Status	assigned => resolved
2018-05-08 12:33	SergeyB	Fixed in Version	=> 3.14.0
2018-05-08 12:33	SergeyB	Resolution	open => fixed

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