how to find the memory map of any process? I used the pmap on unix. But my requirement is to check how much memory has been allocated from any library files.
For example suppose i have one a.exe and it load one abc.so file which alloacate some memory. so can there be any utility to trace which memory is invoked by which .so file.
I have been doing a lot of research on the web to piece together the components I need to understand what is probably a very simple thing. I've read up on buffers/cache vs. physical memory and using free -m and top and understanding that output, and reviewed Red Hat's article on virtual memory. I am hoping to get some assistance in putting it all together to understand what's happening in my situation because so far I have a lot of dangling factoids and no glue. I have also referenced the thread http://www.linuxquestions.org/questi...memory-309767/ but I didn't find my answer there.
My company is running a cluster of physical web servers (they are clones so running the same OS, with same RAM and applications installed). I'll be referring to a single system although the question applies to all because they're all showing similar output. The Multi Router Traffic Grapher is showing a steady swap usage for 3-4 months now. The average usage for today is 81%. There is, as far as I know, no performance hit because of it, but a developer noticed this and wanted to know what was going on, and I'd using this opp to learn. The system is Linux version 2.6.18-128.7.1.el5, running JBOSS, postgres, Apache, and Java. Here is the output from the memory commands I have used to try and understand what's going on.
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top - 21:19:27 up 159 days, 7:43, 1 user, load average: 0.52, 0.61, 0.64
Tasks: 144 total, 1 running, 143 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2%us, 8.0%sy, 0.0%ni, 91.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
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So my interpretation of this output tells me that my system has 4GB of RAM installed, 23MB of free "physical" RAM, and 1.35GB of RAM in cache (according to the second line of free -m, which represents free physical memory and useable mapped memory if I understand correctly). I have a 2GB swap partition, 1.5GB of which is currently being used, and according to the MRTG is the average that has been in use since January. So the swap size isn't decreasing. Java (JBOSS) is using the most physical RAM at 1.6GB.
My question is: if I have 1.35GB of RAM cached, why is my system using all of that swap space and not using any of the cached RAM? I thought I understood that Linux is supposed to either re-use unmodified pages in cache or send older pages to disk when more RAM was needed. It seems like my system is always sending pages to disk, which I guess would normally mean I just need more RAM but, to have close to the same swap size consistently seems like there must be more to it.
Are there any tools to view/edit user space memory of running processes on Linux?
It would be a great learning tool.
I'm searching monitoring tools which can listen disks, overhead, cache, memory, cpu performance.Can anybody help me?
View 4 Replies View RelatedWhen writing a script using command-line tools why is it more difficult using graphical tools?
View 3 Replies View RelatedI need to install the scripts of angstrom distribution
ie ARM gcc..................how to install the scrpits from the site [url]
I checked xen-tools on a Debian Lenny system
Got following
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This package contains tools to manage Debian based XEN virtual servers.
Using the scripts you can easily create fully configured Xen guest domains (domU) which can be listed, updated, or copied easily.
Homepage: [url] in the above output I am getting a line Conffiles and then you can see a series of /etc what are that and is it an error or some conflict?
I have a computer with 16GB of ram. At the moment, top shows all the RAM is taken, (NOT by cache), but the RAM used by the various processes is very far from 16GB.I have seen this problem several times, but I don't understand what is happening.My only remedy so far has been to reboot the machine.
View 1 Replies View RelatedI get this error when I run "sudo apt-get install python-software-properties"
Preconfiguring packages ...
dpkg: unrecoverable fatal error, aborting:
fork failed: Cannot allocate memory
E: Sub-process /usr/bin/dpkg returned an error code (2)
I'm trying to install deluge via ssh and my vps has 512mb ram and is only using 11% of it prior to running the code.
I have had a fresh install of Ubuntu 9.10 and installed some software after that.Since third some, some process is eating half of my memory.I have checked processes running in system manager but everything is normal.Maximum is consumed by compiz which is about 26 mb, seems very normal.I did restarted my computer several times, and in the start for 5 mins, its fine after that again my cpu fans runs at very fast speed and my one cpu is used up 95 % (I have dual core).Please help me out, this invisible thing is driving me crazy.I am attaching my htop screen shot (sorted by cpu %), now the cpu is not used by completely but fan is still struggling hard and fast.
View 9 Replies View RelatedI am using malloc and frees a lot in my program. It shows its allocated but when i remove it doesnt show as the memory is removed(I am using the top command to view VIRT memory usage). If this continously grows what would happen to my program (Will it go out of memory?)
View 4 Replies View RelatedFedora 14 xfce
HP Mini 210
I am looking to buy some memory for my netbook. Currently I have 1 GB of DDR3 memory. However, the specification says that 2 GB of memory is the max. However, when I do the following it says that 4GB is the max:
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let me know how to clear cache memory ( RHEL 5.1 ) as it consumes almost 100% physical memory.
View 3 Replies View RelatedI am looking for free database that has low memory usage and innodb and memory like engins that has C API and support trigger and client/server support for using in embedded linux systems.
View 8 Replies View RelatedI am new to C and linux. My code below does arbitary writes but I cant figure out where or how it does it.
I am calling the insertNode() function with seq = 'MISSISSPPI$' and alphabets = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ$'
Code:
Weird behaviour I should mention is that when I check for NULL pointer in node->child[index], the unassigned values are not null anymore, they point to arbitary memory.
we found that if we use 'top' to show the memory usage of a server (SuSe Linux 10), we can get virtual memory usage as well as 'Resident memory' usage. For virtual mem or a particular process, it is around 1.1GB, which is large but for resident memory, it only consumes 300MB. Are there anyone who knows what the differences are? I would also like to know whether the difference (1.1GB - 300MB) = 800MB are actually available for use by other applications in the system.
View 1 Replies View RelatedHow do I write a script for my Linux that can show me total memory vs used memory and have it email me results if it's over 70 percent?
View 2 Replies View RelatedI am monitoring physical memory in a server I administer, and my hardware provider told me they had increased physical memory size to 4Gb... However, using several tools (free -m; top; dmesg | grep Memory; grep MemTotal /proc/meminfo I discovered that I actually have 3Gb, not 4... But, my doubt comes from the fact that dmesg | grem Memory tells me I have 3103396k/4194304k available The first number is effectively 3Gb, but the second one, is 4! so, why I am looking at this two different numbers?
View 1 Replies View RelatedI am writing an application that wants to access periphals registers outside the standard (allowed) memory area.
Doing so gets me "segmentation fault".
I know, this is natural behaviour.
One way of getting around this is writing the module which has to be loaded by linux. I will consider this some time later.
For now, I want to come to some quick result and allow linux or gcc compiler to write to those memory areas of periphals. Is there a direct way to do so?
Is that possible that SHM shared memory is counted as cache memory on Linux with kernel 2.6.18?If find it really odd since this memory is not file backed, but I have a piece of code that loads data using shm_open+mmap, and it generates an amount of cache memory in /proc/meminfo that corresponds exactly to the amount of shared memory (I load that data from a file but I am using posix_fadvise(fd,0,0,POSIX_FADV_DONTNEED) to ensure this file is not cached and I made sure that it is working as expected). As far as I know SHM memory was not tagged as cache memory with kernel 2.6.9.If it is the case it is really unfortunate since normally cache memory can be considered to be part of the "available" memory since it can be flushed promptly but this is clearly not the case with SHM memory... Is there an easy way to get the total amount of used SHM memory on a system?
View 4 Replies View RelatedThis is my first post in these forums. I'm still quite new to Linux (using Mint 9) so please bear with my not-very-articulate question(s)When I boot up and open up a tty terminal I get a message saying "Memory corruption detected in low memory." I've done an extensive google search about the issue and it seems not uncommon. I ran a memtest with no errors returned, so I'm sure that there's nothing really wrong with the memory; apparently it's a bug in the kernel that's causing this.
View 2 Replies View RelatedI found from command 'top' that 8GB memory are used. However, using command 'ps' with some options to grep the running processes and then summing up the memory used by the running processes are less than 2 GB. Where has the used memory gone ?
View 7 Replies View RelatedI have been setting up a vps I got out with bhost.net, with CentOS installed. I've been learning and have set up everying I need with the exception of ftp/sftp.
Using yum I installed vsftpd and ran into problems, thinking it was something I might of done I did a fresh install of CentOS and I still recieve the same problem on a fresh install so it is nothing I have done to the server.
The problem is when connecting via a sftp client I get an out of memory error. This error is listed in the putty faq ( url ) under A.7.5, there is a brief explaintion of the cure under A.7.6.
there is mention of a login script but I don't know where this is located. I'm a novice at Linux but by no means incompotent when it comes to computing.
I have a query regarding top & virtual memory. When we run top it show VIRT (Virtual Mem), RES (Resident Mem) & SHR (Shared Memory). The total virtual memory of my machine is 4 GBs (2 GB RAM + 2 GB Swap), but still I am able to see a process showing 4000m virtual memory column. what it means, as its show VIRT Mem more than actual available VIRT memory
View 1 Replies View RelatedWhen I start bluej and try to open files from my memory stick the memory stick is not available. Is there any way that I can open files directly in bluej from my memory stick.
View 3 Replies View Relatedbut it said "daemon tools installed" so i think they are installed, but i cant find em anywhere in program center :/ im using newest version of ubuntu
View 7 Replies View RelatedSo after compinline binutils-2.17 so I could build grub, ALL of my development tools (gcc, g++, make, etc.) stopped working completely. none of the libraries will link, etc; just nothing works.ld -v returns:GNU ld version 2.17Ive tried reinstalling binutils-2.20 from the repo's, ive tried everything I can think of.
View 3 Replies View Relatedi have seen this screenshot. There is a programm on the background. Is this possible for Ubuntu?
View 6 Replies View RelatedMicrosoft has a service called Bing Webmaster Tools This service requires Silverlight, and Moonlight isn't supported.
View 1 Replies View RelatedOk so I did some stupid stuff and tried to install some of the Backtrack 4 tools. Now when I tried to install VLC player in terminal I get this:"ph@top:~$ sudo apt-get install vlc Reading package lists. Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:
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