General :: Tools To View/edit User Space Memory Of Running Processes?
Nov 2, 2010Are there any tools to view/edit user space memory of running processes on Linux?
It would be a great learning tool.
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General :: Division Of Logical Memory Space In To User Space And Kernel Space
Jan 4, 2010Logical Memory Space of 4GB is divided in to 3GB User Space and 1GB Kernel Space. Always. Correct?
1. How can we change it? (just changing value of PAGE_OFFSET is okay?)
2. If system have only 256MB of memory (embedded system) and suppose Kernel Modules eat away all the memory during boot. User space will be left will no memory. Is this case possible?
General :: Administrator - Command Used To View Processes Running
Nov 9, 2010The command used to view processes running on the Linux machine is?
View 8 Replies View RelatedGeneral :: Print The Number Of Processes That Each User Is Currently Running In Unix?
Mar 6, 2011I'm trying to get the end result to have the same format as this as well:
1 bin
2 daemon
67 erozner
[code]....
Where the numbers are the number of processes being run by the user (the name right next to it).if I input the command egrep myFile into the terminal, it should look for every line with the letter x in myFile, right?
Ubuntu :: Open A Terminal And Start The 'top' Command To View The Running Processes
Oct 18, 2010When I open a terminal and start the 'top' command to view the running processes, in the summary view I get 4 users. I guess that in addition to my account the root runs in the background but who are the other 2??
View 1 Replies View RelatedFedora Servers :: User Setting - FTP - View / Edit Files In One Certain Folder
Apr 17, 2010I have installed Fedora 12 x86_64 and vsftpd. I would like to set up an user for FTP so that he/she could only view/edit files in one certain folder (the one that I set up). How would I go about doing that?
View 2 Replies View RelatedGeneral :: Top Used Memory Versus Ps Processes Memory
Jan 17, 2010I 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 RelatedUbuntu :: Disable Access To Running Processes For Some User
Jan 9, 2010is there any possible way to hide currently running processes from an user? This means I do not want him to know about what programs/processes does any other user but him run. In short words if that user runs 'ps -aux' he should get only his processes.
View 3 Replies View RelatedGeneral :: Application Virtual Address Space Memory Allocation - Memory Does Not Get Free
Apr 20, 2010I 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 RelatedHardware :: Obtain A Real Memory Address From User Space - Mmap() And /dev/mem
Feb 25, 2010I'm running an embedded Linux kernel, and I want to obtain a real memory address from user space. After goggeling a little, I found that the only way was to use mmap to access /dev/mem. But I never used mmap. I want to load a program in memory, in order to make it available from another processor, that has access to the DDR, but not to the flash memory where program is stored. Here is the code I use:
Code: // Open file and get its size
FILE* program = fopen(argv[3],"rb");
fseek(program, 0, SEEK_END);
long program_size = ftell(program);
fseek(program, 0, SEEK_SET);
// Prepare memory to copy it in
void* program_address = malloc(program_size+1);
FILE* memory_stream = fmemopen(program_real_address, program_size + 1, "wb");
[Code]....
General :: Getting The Multi-processes Memory Used?
Sep 2, 2010The following code is for monitoring the memory used by apache processes. But I got a problem that the data I got by this script is much larger than the physical memory. It was said that there are some libraries used simultaneously by many processes, so the data I got has some double counted part. Because apache has many httpd processes.
Anyone have an idea of getting the multi-processes memory used?
Code:
#!/bin/sh
#G.sh 20100813
USAGE="Usage: $0 processName"
[Code].....
General :: Get The Physical Memory Used By A Couple Of Processes?
Sep 3, 2010I am doing a test to get the memory used by apache`s apache2 processes. I used a script to get VmSize and VmRss from /proc/pid/status, and loop through that to get the sum of VmSize and VmRss of all the apache2 processes.
I found the VmSize (about 4GB) and VmRss (about 3.4GB) are much larger than the physical memory (1GB) when apache server was saturated. It was said because of the multi-counted libiraries size used by many processes simultaneously. Then , how to get the physical memory used by apache2 processes? Or how to get a more reasonable memory data?
General :: Memory Optimization For Child Processes?
Sep 6, 2010I work on Linux for ARM processor for cable modem. There is a tool that I have written (as the job demands) that sends/storms customized UDP packets using raw sockets. I form the packet from scratch so that we have the flexibility to play with different options. This tool is mainly for stress testing routers.I actually have multiple interfaces created. Each interface will obtain IP addresses using DHCP. This is done in order to make the modem behave as virtual customer premises equipment (vcpe).
When the system comes up, I start those processes that are asked to. Every process that I start will continuously send packets. So process 0 will send packets using interface 0 and so on. Each of these processes that send packets would allow configuration (change in UDP parameters and other options at run time). Thats the reason I decide to have separate processes. I start these processes using fork and excec from the provisioning processes of the modem. The problem now is that each process takes up a lot of memory. Starting just 3 such processes, causes the system to crash and reboot.
I have tried the following:-
1-I have always assumed that pushing more code to the Shared Libraries will. when I tried moving many functions into shared library and keeping minimum code in the processes, it made no difference to my surprise.
2-I also removed all arrays and made them use the heap. However it made no difference. This maybe because the processes runs continuously and it makes no difference if it is stack or heap?
3-I suspect the process from I where I call the fork is huge and that is the reason for the processes that I make result being huge. I am not sure how else I could go about. say process A is huge -> I start process B by forking and excec. B inherits A's memory area. So now I do this -> A starts C which inturn starts B will also not help as C still inherits A?. I used vfork as an alternative which did not help either. I do wonder why.
General :: Find Out Processes Are Using Swap Space?
Jun 21, 2011I have a linux server top reports about 9GB of swap used:But I cannot figure where's it use swap, some google results said that top - O commad follow by p will show swap usage by process. But as shown in the above image, taking a brief sum of the SWAP column shows that > 10GB of swap is used, so where does the 9GB figure for swap usage come from? Top reports that about 96492kb of ram is used by buffers. Is there anything I can do to utilize this, instead of using swap?
View 1 Replies View RelatedGeneral :: Interpreting Output Of Memory Tools In RHEL 5.3?
Mar 15, 2010I 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.
Code:
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
[code]....
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.
General :: Child Processes Of A Parent Process Occupying Socket Memory?
Jul 22, 2010I am facing an issue where the process starts hanging. When I closely look at the logs I come to know that some of the child processes that are forked by the parent process are not finished.
1) Is it possible that the child processes that are not finished occupy the socket memory of the parent process and ultimately a point is reached where no socket memory is available to fork new child processes.
2) What is the standard limit of socket memory in linux?
3) What is the fate of such child processes (as I have mentioned above)?
4) How to debug such cases so that the exact problematic area is identified?
General :: Tools To Identify A Growing Disk Space?
Sep 30, 2010currently my disk-space is growing very-very fast and in the same time I have a very limited amount of it.Last time I had this kind of problem, I had MySql persistence replication is on and disabling the feature fix the problem. I don't know what happened between now and then, the space is shrinking rapidly (600Meg in couple of days) and I only downloaded files for less than 10Meg in the same period.
Could anybody give me a pointer to a tool that can oversee growing directories or files or maybe a script that able to do this (possibly involving Cron). I try using "Find" but I cannot find any files that are suspiciously growing. I suspect it's a directory that is growing, but I don't know.
General :: Create _ Edit And View A File In System?
Oct 5, 2009How to I open, create, edit, or view a file in Linux?
View 5 Replies View RelatedGeneral :: Program To View Data In Memory RAM?
Aug 5, 2011I'm running a java program and to debug the program instead of using a debugger I would like to look to the heap and to the bytes in the memory of the process. I was hoping that the pointers would give me a snapshot of a moment of the application. It exists a program that allow us to look to the details of a process and to the memory ram?
View 2 Replies View RelatedGeneral :: Change Filezilla Settings So View / Edit Use Gedit
Jul 4, 2010Similar to this question [URL] but I am asking for filezilla in linux. I am using ubuntu lucid 10.0.4. Currently my filezilla opens files using openoffice. I want to change to gedit for all the .log files etc. Some reason, my filezilla has no File Edit and other settings. This is the screenshot [URL].
View 1 Replies View RelatedGeneral :: Calling User Space Callback Function From Kernel Space?
Sep 22, 2009I am writing device driver in which i have to call callback function from kernel space, which are saving my data. But the callback functions are in userspace. While accessing them i am getting segmentation fault.
View 1 Replies View RelatedGeneral :: How To Know What Processes Are Running
Jun 6, 2010GNU/linux kernel 2.6, Slackware 12.0.Hi:How do I know what processes are running?
View 6 Replies View RelatedGeneral :: Wrote A Program That Multiplies 2 Matrices Using Multi-threads And Another One Using Multiple Processes And Shared Memory?
Sep 22, 2010I wrote a program that multiplies 2 matrices using multi-threads and another one using multiple processes and shared memory. Both in C.I need to find the total memory usage of these programs. I know of the top command, but when my matrices are relatively small they don't even show up on top because they complete so fast, how can I find the memory usage for these instances?Also, how can I find the total turnaround time of my programs
View 1 Replies View RelatedGeneral :: Virtual Space Seen By Each New Process In User Space?
Jun 21, 2010In a 32-bit system, max memory addressable is 4GB. Now Linux kernel does memory mapping division of 1GB for kernel address space and 3GB for user address space. That means 4GB of virtual address space is divided between kernel (1GB) and user (3GB).
Q1. All virtual mapping utilizes the available physical RAM without any division? I mean to say that if RAM is 512MB then a page in kernel space can lie any where RAM (leave aside old PCI dma accesses)? (How this fits to fact that kernel memory is non-pageble)
Q2. If a process is created in user space, it has visibility 4GB address space or 3GB address space?
General :: How To Count How Many Of Processes Are Running
Nov 3, 2010I list all the instances of a running process my doing:ps -ef | grep myprogramThis lists all them.how can I simply output a count of how many are running?
View 2 Replies View RelatedGeneral :: Max User Processes Different For The Same User?
Apr 13, 2011When i do the following with logged in with root:
Code:
i get
Code:
When i login with user1 and do ulimit -a
i get
Code:
Why is the max user processes different for the same user? And how can i change this. I need for this user more then 20 processes...
General :: Processes With Effective User Name Or ID
May 21, 2009I am studying for the LPIC-1 exam, and reading a book that they recommend: "Introduction to Linux: A Hands-on Guide", by Machtelt Garrels. There's one question on the 4th chapter (Processes), that I found confusing: Question: Based on process entries in /proc, owned by your UID, how would you work to find out which processes these actually represent?
What does he mean? If I run the command (considering that my username is sl33p):
Code:
$ps -u sl33p
...gives me the right answer?
The ps man page says:
-u userlist
Select by effective user ID (EUID) or name.
This selects the processes whose effective user name or ID is in userlist. The effective user ID describes the user whose file access permissions are used by the process (see geteuid(2)). Identical to U and --user.
General :: Shell Script Searches Processes Running?
May 20, 2010how to write a shell script the searches for processes running on my system. I really don't know where to start. can anyone give me a hand and explain how the script works?
View 3 Replies View RelatedGeneral :: Killing All Processes Of Current User?
Jun 15, 2010user@host$ killall -9 -u user Will it definitely kill all processes owned by user (including forkbombs)?
No new processes is spawned to user from other users. No user's processes are in D-sleep and unkillable.No processes are trying to detect and ptrace or terminate this started killall (but they can ptrace or do other things with each other) There is ulimit that prevents too much processes (but killall is already started and allocated it's memory)
E.g. if killall will finish untampered and successfully is it 100% that no processes are left with this uid? If no, how to do it properly (with standard commands and no root access). Will SysRq+I definitely kill all things (even replicating)?
General :: Kill All Idle User Processes ?
Nov 18, 2010All the kill idle user processes scripts I've seen don't take into account that the user might have multiple sessions open. Such is the case with one of our clients. Currently, every hour or two I need to do the following:
This will get the TTY and idle time for all users.
For each idle time over a half hour, I do the following (TTY is the TTY from the previous command with a space.
I then kill those processes.
There must be a way to do this automatically in a bash or perl script. I've tried both, but can't seem to get things to work properly.