opt-malloc-options

Lets you specify an alternate algorithm for malloc().

IDE Equivalent

None

Architectures

IA-32, Intel® 64 architectures

Syntax

Linux and Mac OS X:

-opt-malloc-options=n

Windows:

None

Arguments

n

Specifies the algorithm to use for malloc(). Possible values are:

0

Tells the compiler to use the default algorithm for malloc(). This is the default.

1

Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=2 and M_TRIM_THRESHOLD=0x10000000.

2

Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=2 and M_TRIM_THRESHOLD=0x40000000.

3

Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=0 and M_TRIM_THRESHOLD=-1.

4

 Causes the following adjustments to the malloc() algorithm: M_MMAP_MAX=0, M_TRIM_THRESHOLD=-1, M_TOP_PAD=4096.

Default

-opt-malloc-options=0

The compiler uses the default algorithm when malloc() is called. No call is made to mallopt().

Description

This option lets you specify an alternate algorithm for malloc().

If you specify a non-zero value for n, it causes alternate configuration parameters to be set for how malloc() allocates and frees memory. It tells the compiler to insert calls to mallopt() to adjust these parameters to malloc() for dynamic memory allocation. This may improve speed.

Alternate Options

None

Parent topic: O Options

See Also

malloc(3) man page

mallopt function (defined in malloc.h)


Submit feedback on this help topic

Copyright © 1996-2010, Intel Corporation. All rights reserved.