Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Memory allocation for particular process in UNIX
Top Forums Programming Memory allocation for particular process in UNIX Post 302936594 by kbw on Thursday 26th of February 2015 01:52:03 PM
Old 02-26-2015
"I want to allocate specific heap size for that process (C program) to run."

I see, I must have been answering the wrong question. Ok, lets start again.

C does have a "virtual machine". In fact, the C virtual machine pretty much maps onto a real machine, that's what makes C so fast, because there's no translation. The C virtual machine has a call stack and a heap formed at opposite ends of the same memory block. The stack may have a fixed size, but the heap is everything else. So if you put more RAM in the machine, it shows up as more heap.

If you need memory you use it and hand it back when done. There's no portable way to put an upper limit on the heap. You may be able to specify it some custom heap, but not in a general way,

If you need memory just allocate it. The Java VM should coexist with the underlying system allocator.

So, in short, you can't limit it in a general way, and it shouldn't bother you that you can't.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

memory allocation

I would like to know how I could allocate some more memory to a process. Please note that I am not the root user. (1 Reply)
Discussion started by: sagar
1 Replies

2. UNIX for Advanced & Expert Users

threads and memory allocation

Hello! First of all, forgive me for bad English. When I starts new thread (pthread_create), system allocates some memory for it (for example, for thread's stack). I wonder when does it deallocate this memory? The problem is that I have a program which sometimes creates new threads and sometimes... (3 Replies)
Discussion started by: prankster
3 Replies

3. UNIX for Dummies Questions & Answers

HP-UX memory usage allocation

Hi all, I have a HP-UX Server with 4 gigabytes of physical RAM. When I use the 'Glance' utility to see what my memory utilization is, my memory usage shows up maxed out at 99%. I shut off all the known processes that I'm running on that box and the memory utilization is still at 78% (with Swap... (1 Reply)
Discussion started by: dehuang83
1 Replies

4. HP-UX

HP-UX memory usage allocation

Hi all, I have a HP-UX Server with 4 gigabytes of physical RAM. When I use the 'Glance' utility to see what my memory utilization is, my memory usage shows up maxed out at 99%. I shut off all the known processes that I'm running on that box and the memory utilization is still at 78% (with Swap... (3 Replies)
Discussion started by: dehuang83
3 Replies

5. Programming

memory allocation in subroutine

Hi everyone, I'm not new to C programming, but I'm having question regarding the memory allocation of a pointer variable which, for instance, will be declared in main(), but its memory will be allocated in subroutine. To clearify my question, I provide a small working example: #include... (1 Reply)
Discussion started by: MIB_Maik
1 Replies

6. Programming

Memory allocation in C

Hi Experts I need some help in static memory allocation in C. I have a program in which I declared 2 variables, one char array and one integer. I was little surprised to see the addresses of the variables. First: int x; char a; printf("%u %u\n', &x, a); I got the addresses displayed... (2 Replies)
Discussion started by: unx_freak
2 Replies

7. Shell Programming and Scripting

memory allocation to a variable

hello all.. i'm a beginner in shell scripting. I need to know what is really happening when we are creating a variable in shell scripting? how memory is allocated for that variable? (3 Replies)
Discussion started by: aarathy
3 Replies

8. HP-UX

Single Process Memory Allocation HP-UX 11i v3

Hi, I have HP-UX 11i v3 running on ia64. One of my application is 32-bit and I want to increase the memory allocation of this file upto 2GB. I am contentiously receiving an error message of Out of Memory. Can you please explain the procedure what kernel configuration( like maxdsize or... (1 Reply)
Discussion started by: ahmadamin416
1 Replies

9. Programming

C++/ROOT Memory Allocation?

Hello, I am new to C++ programming, so I'm still getting a feel for things. I recently wrote a simple C++ program (to be used as a ROOT Macro) to conduct a statistical analysis of a varied version of the Monty Hall problem (code below). Basically, the programs runs a few simple calculations to... (7 Replies)
Discussion started by: Tyler_92
7 Replies

10. UNIX for Dummies Questions & Answers

Memory allocation problem

I am using ubuntu. I have written a program to calculate prime factors. it works perfectly fine till entered number is less than 9989 (or so ) but when one enters a number higher than that, for example 15000, it does not work. Can anyone guide me whats the problem ? although new codes are welcome,... (2 Replies)
Discussion started by: Abhishek_kumar
2 Replies

LEARN ABOUT MOJAVE

jmap

jmap(1) 						      General Commands Manual							   jmap(1)

NAME

       jmap - memory map

SYNOPSIS

       jmap [ option ] pid
       jmap [ option ] executable core
       jmap [ option ] [ server-id@ ] remote-hostname-or-IP

DESCRIPTION

       jmap prints shared object memory maps or heap memory details of a given process or core file or remote debug server.

       NOTE  - This utility is unsupported and may or may not be available in future versions of the J2SE SDK.	jmap is not currently available on
       Windows platforms or on the Linux Itanium platform.

PARAMETERS

       option	      Options are mutually exclusive. Option, if used, shouldfollow immediately after the command name.

       pid	      process id for which the memory map is to be printed.  The process must be a Java process. To get a list of  Java  processes
		      running on a machine, jps may be used.

       executable     Java executable from which the core dump was produced.

       core	      core file for which the memory map is to be printed.

       remote-hostname-or-IP
		      remote debug server's (see jsadebugd) hostname or IP address.

       server-id      optional unique id, if multiple debug servers are running on the same remote host.

OPTIONS

	<no option>   When  no	option	is used jmap prints shared object mappings. For each shared object loaded in the target VM, start address,
		      the size of the mapping, and the full path of the shared object file are printed. This is similar to the Solaris pmap  util-
		      ity.

       -heap	      Prints a heap summary. GC algorithm used, heap configuration and generation wise heap usage are printed.

       -histo	      Prints  a  histogram  of	the  heap. For each Java class, number of objects, memory size in bytes, and fully qualified class
		      names are printed. VM internal class names are printed with '*' prefix.

       -permstat      Prints class loader wise statistics of permanent generation of Java  heap.  For  each  class  loader,  its  name,  liveness,
		      address, parent class loader, and the number and size of classes it has loaded are printed.

       -h	      Prints a help message.

       -help	      Prints a help message.

SEE ALSO

       pmap(1) jps(1) jsadebugd(1)

								   13 June 2004 							   jmap(1)
All times are GMT -4. The time now is 02:29 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy