Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Reserve resources (memory and processes)
Top Forums Shell Programming and Scripting Reserve resources (memory and processes) Post 302453784 by Corona688 on Thursday 16th of September 2010 11:38:14 AM
Old 09-16-2010
From the sounds of it you're on Linux, and running into the OOM-killer when things get tight. Correct me if I'm wrong.

Preallocating memory won't prevent the OOM-killer from hitting you, if anything, hogging more memory and more processes will put you higher in its list. Band-aiding a fix onto your scripts won't stop the server from running out of memory anyway, at best it'll deflect the OOM-kill to something else. What would they rather have die, your scripts, the memory-intensive processes, some daemon, or things more system-critical? They need to add more memory and/or swap, or to start restricting the stupid users that keep bombing the system.

One way to "preallocate" memory in a shell would be to make and clear a large shell variable, I suppose, but that's subject to the max size of a shell variable in your shell and all kinds of hackish and ugly and unlikely to work:
Code:
MEMHOG="$(dd if=/dev/zero count=1024 bs=1024 2> /dev/null | tr '\000' 'a')"
MEMHOG=""

Last edited by Corona688; 09-16-2010 at 12:44 PM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

How to find memory and other resources in AIX

Hi, Im trying to find memory and other resources in IBM AIX. Please let me know how to do this. (3 Replies)
Discussion started by: R00tSc0rpi0n
3 Replies

2. Solaris

Reserve Memory for Global Zone

We have several containers on one machine and would like to reserve some memory for the global zone. capped-memory only allows max physical/swap and setting a max on each container isn't an option. The server has 32GB physical and 30GB swap. Currently there are ten containers on it. Normally... (6 Replies)
Discussion started by: kharjahn
6 Replies

3. Shell Programming and Scripting

Processes in Shared Memory

Hello , I would like to know how to check if a given process id belongs to particualr shared memory segment . Please help Thanks in advance (3 Replies)
Discussion started by: rmv
3 Replies

4. Homework & Coursework Questions

processes and shared memory

Hi again! I have 2 questions ..: How can i create exactly one number of processes ? For example i want to create l*n processes and i tried this: for(i=0;i<l*n;i++){ pid=fork()} But it creates more than l*n Also, i want each child to run another x.c program with 3 command line... (1 Reply)
Discussion started by: giampoul
1 Replies

5. Homework & Coursework Questions

processes and shared memory

Hi again! I have 2 questions ..: How can i create exactly one number of processes ? For example i want to create l*n processes and i tried this: for(i=0;i<l*n;i++){ pid=fork()} But it creates more than l*n Also, i want each child to run another x.c program with 3 command line... (1 Reply)
Discussion started by: giampoul
1 Replies

6. Solaris

How get memory and cpu usages of user's processes?

I have the processes (100+) by the oracle id and I'd to get the summarized view of the oracle processes' usage of the memory and the cpu. top would give me some, but not all. Thanks (3 Replies)
Discussion started by: iwmi
3 Replies

7. Red Hat

Best way to monitor use of memory resources for an RHEL instance

I wanted to know what is the best way to monitor use of memory on an RHEL server. We have 16 GB of memory for the RHEL instance but the usage at any time is more than 99%. I use /proc/meminfo on the server to check memory. I hope, my question is clear that what is the best way to monitor use of... (2 Replies)
Discussion started by: RHCE
2 Replies

8. Shell Programming and Scripting

List processes using my memory

Here is the output of top command So you see 99% of memory is in use -> Mem: 66005468k total, 65662548k used, How can I find out all processes consuming this 99% memory in descending order of consumption i.e. starting with processes eating more memory. I need the total of the output to... (3 Replies)
Discussion started by: mohtashims
3 Replies

9. Programming

JVM processes are not getting memory allocation as soon as started

Hi, i have this scenario, when i start about 20 java processes simultaneously in unix and run ps -eaf command i can see that processes are running but memory is not getting allocated to them immediately and it stays ideal for at least 10-15 min. Meanwhile i run free command to check the RAM,... (5 Replies)
Discussion started by: Vishal Gangrade
5 Replies

10. AIX

AIX memory usage by processes

Hi, i have 2 identical web servers using AIX. I use nmon analyser to check their performance. The server A exceeds 20% memory usage for system, 5% for cache and the rest 75% for processes. While, it uses 4% of Paging Space. The server B exceeds 20% for system, 45% for cache and 35% for processes.... (24 Replies)
Discussion started by: dim
24 Replies

LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
All times are GMT -4. The time now is 04:51 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy