memory allocation

Question

0.00/5 (No votes)

See more:

Hi,

How much memory can we allocate with the help of malloc function
( malloc(sizeof(?)); )?

What is the max number in place of '?' mark?

I want to allocate 1 GB memory at a time, is this possible?

How does it depend on the system?

Posted 24-Aug-10 23:57pm

patilvaibhavrao

Updated 25-Aug-10 1:23am

Aescleal

v5

Add a Solution

Comments

Dalek Dave 25-Aug-10 6:01am

Edited for Grammar and Syntax.

CPallini 25-Aug-10 6:26am

Edited Dave's comment for grammar and syntax. :-D
Removed the OP ridiculous 'it is urgent' sentence.

Aescleal 25-Aug-10 7:24am

Changed the tags to something more reasonable for the question

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Nyarost · Answer 1 · 2010-08-25T00:06:00

Solution 1

Hope this will help

Actually it depends on system.

Posted 25-Aug-10 0:06am

Nyarost

Comments

patilvaibhavrao 25-Aug-10 6:10am

how it is depend on system

Nyarost 25-Aug-10 6:11am

Well I suppose there are different limits for Windows, Linux, BSD. Also it depends on system architecture: i386, amd64, ia64 and so on. Formula on Wikipedia says The maximum value is 2CHAR_BIT*sizeof(size_t) - 1, or the constant SIZE_MAX in the C99 standard. I assume you should check this constant.

Niklas L · Answer 2 · 2010-08-25T00:41:00

Solution 2

4 bytes if you use an integer argument, 8 if you use a double.

Operator sizeof will return the size of the operand.

malloc(sizeof(675468)) => malloc(4), etc

Assuming 32 bit environment.

Posted 25-Aug-10 0:41am

Niklas L

Cedric Moonen · Answer 3 · 2010-08-25T00:57:00

Solution 3

In addition to the other replies: if you have to allocate 1GB of memory, it is likely that you have so design issues. Why do you need to allocate that much memory at once ? What are you going to do with it ?

Posted 25-Aug-10 0:57am

Cedric Moonen