General :: Calculate Total Memory Consumed By User?

Sep 20, 2010

is there a way to calculate the total memory consumed by user ?

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Server :: Calculate The Total Amount Of Memory Used By The System?

Jul 15, 2010

I want to calculate the total amount of memory used by the system, Someone please confirm if the below formula is correct.Quote:

((memUsed-mebBuffers-memCached)*100)/memUsed => totalMemoryUsed%
free -o
total used free shared buffers cached
Mem: 8167004 8115292 51712 0 87680 1444676
Swap: 8388584 3252996 5135588
((8115292-87680-1444676)*100/8115292) => 81%

As per the above calculation 81% of memory is used.Is this correct? and if so Am I running out of memory?what is the limit in % that I should maintain for a better performance?

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Programming :: Write A Script To Calculate The Total Amount Of Installed Memory?

Apr 4, 2011

I am trying to write a script to calculate the total amount of installed memory to use during an anaconda kickscript, so the swap file is created at 2 x the installed memory. I so far have the amount of installed RAM DIMMS but need a way to total them up and produce a varible I can use in the pre section of the install.


dmidecode -t 17 | grep Size | awk ' { print $2 }'

Note: on some servers there could be from 1 DIMM up to 16 DIMMS installed so the script needs to be able to handle this. I also can not use bc as it does not exist during the install stage. I am guessing I need a while loop to do this and use expr but do not know where to start for this logic.

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Software :: All Memory Being Consumed By Only A Few Processes?

Jan 25, 2010

I recently built a new server, running 64 bit Slackware 13.0 with the following specs:

MSI 785GTM-E45
AMD Phenom II X2 550
Onboard video from AMD 785G chipset
2x 80GB IDE system drives using software RAID with 2GB swap partition

I only include these because I'm not convinced my problem is not hardware related at some level. Basically, when I first start up the system, the memory usage is anywhere from 60 to 200MB. Then it starts to gradually climb until there is only 12-15MB free. This can take anywhere from a few hours to a few days.

The only thing I really use this for is to serve Samba shares and the occasional SSH login. I've set up Samba shares to be accessed by my Windows machines as well as a Mac. Initially I just explored the network if I wanted to see the share from these machines, but that was too slow and unreliable (the server would not always show up in Windows), so now I automatically mount the share as a network drive at startup (from Windows). So I don't know if this would have anything to do with the steadily increasing memory usage. These systems are not on/connected all the time, but the memory usage seems to rise anyway.

When I run top, it reports that nearly all of the physical memory has been consumed (after a while of uptime), but none of the swap space has even been touched. This is a typical output of the first several lines, sorted by swap size:


top - 07:45:48 up 2 days, 12:33, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 105 total, 1 running, 104 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st


I can't be sure, but I believe the message just repeated itself before this part. MS-7549 is one of the components of the mainboard (MSI), maybe the northbridge or something (it seems to be associated with more than one model), so I thought for sure this meant a hardware problem, maybe with the storage controller or memory. But Memtest86 passes for more than a day without any errors, and I loaded Windows on one of the disks and ran it as hard as I could with prime95 and nothing so much as flinched. So I've got to think this is some kind of issue with linux and/or how it is handling my hardware configuration.

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CentOS 5 Server :: Determine Memory Consumed By Each Application Running?

Feb 22, 2011

What would be the best way to determine memory consumed by each application running on the server?

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Programming :: Write A Script That Can Show Me Total Memory Vs Used Memory?

Apr 13, 2010

How 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?

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General :: Vmstat's Total Memory Statistic?

Sep 20, 2011

I am analyzing memory usage on a Linux system. When I run vmstat -s, I see the following:

waffleman@waffle-iron:~$ vmstat -s
3549184 K total memory
3206708 K used memory
1918012 K active memory
1037320 K inactive memory
342476 K free memory


I know the system has 4096 MB of RAM installed, but why does it show only 3466 MB? Can this be interpreted as total "available" memory? Perhaps the missing 630 MB is being used by the kernel and cannot paged out?

I also tried this on on an Embedded Linux system and saw a similar result. The DRAM chip has 128 MB, but only 124 MB shows up in vmstat.

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General :: Noticed That The Total Used Memory A Lot Higher Than Sum Of RSS?

Jul 9, 2010

i got a RHEL 5.2 machine.and i noticed that the total used memory(as shown in "free" command) is 3GB higher thanthe sum of RSS size of all processes(collected using "ps aux").i know that its not suppose to be exact because RSS counts ultiple times shared memory (so actually it suppose to be higher than the used memory).the server runs apache which runs a pretty heavy php suspicion is that its memory leak?

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General :: Find Total Memory Usage Of A Program?

Sep 22, 2010

I 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?

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Server :: Calculate Memory Available If Needed On A System?

Jul 16, 2010

I have set swappiness to 0:

# sysctl vm.swappiness
vm.swappiness = 0

According to various sources, this should mean that applications have priority over file chaches, and swap should only be used when the applications themselves need more memory than is physically available. So I naively took the value free provides in the '-/+ buffers/cache' line as 'free' as the amount of memory to be available on the server. Unfortunately this is not even close to true: On a server with 20GB RAM, memory utilization by this measure never reached 50%, yet the system swaps.

I then figured out that I could use 'sync; echo 3 > /proc/sys/vm/drop_caches' to drop cached stuff. I was very surprised to still have 12.5 GB cached data after doing that. I am figuring that it's those 12.5 GB which force the system to start swapping. I also tried to use /proc/meminfo to figure out how that cached memory is used (by comparing its content before and after dropping caches). However, I don't see the correlation between the numbers provided there and what part of the cache can be dropped.

The closest match seems to be the 'Mapped' line, which was 10GB. I am pretty sure that being mmapped keeps the kernel from dropping cache. However, the value is 2.5 GB less than the cache which can't be dropped. So it is not the whole answer. What I am looking for is some way to determine how much memory the kernel could provide by dropping stuff if he needs to because of memory pressure. Is there maybe a way to simulate drop_caches without actually doing so?

The amount of potentially available memory does not have to be scientifically correct, but the number should at least be always in the right ballpark, which right now, it ain't... The point here is that it's a productive system. Sy doing stuff like dropping caches or filling memory until the system starts to swap is not a permanent solution to figure out the value. By the way, it turned out that postgres was the culprit in this concrete case, stopping it made dropping all caches possible, but that does not answer the general question of how to estimate available memory...

1. Is my assumption correct that I can subtract 'Mapped' from the freeable cache memory completely?

2. Where could the other 2.5 GB be used?

3. Is there a way to get a better guess of how much memory the system can free if necessary, before swap has to be used?

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General :: Give Total Access To The System To A User Other Than Root?

Mar 9, 2011

How can you give total access to the system to a user other than root?

* Make the user a member of the root group.
* Change the UID of the user to 0.
* Add the user to the /etc/sudoers file.

I think none of these are correct answers.

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Programming :: Calculate Flash Memory End Address Of A Certain File?

Mar 9, 2011

how to calculate (if possible) the end address of an image file in a flash memory. I'm trying to create a checksum and checkheader function and the info that I got is the file's offset, how many sector it consumes and its size. I kinda need the end address, sad thing is, I don't know how to calculate it.test.img's start address is 0, the size is 0x20000 and consumes 3 sectors.

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Programming :: Total Amount Of Allocated SHM Memory?

Aug 25, 2010

Is there an easy way in C to get the total amount of allocated SHM memory on a machine?

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Slackware :: Total Memory Being Reported Incorrectly?

Jan 20, 2011

I'm running 13.1 on a Dell Latitude D630 with 4GB of RAM. My problem is that Slackware doesn't seem to see all of the available memory. Here are the #s being reported (just including pertinent #s rather than all output)...

free -m
total: 3546


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Hardware :: RHEL5.3 Is Not Showing Total Physical Memory?

Aug 27, 2010

I have rhgel5.3 installed on IBM blade server having 16 GB of physical memory. But it showing only 4GB.

#cat /proc/meminfo
#free -m


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Server :: Find Total Apache Memory Usage?

Sep 12, 2010

Top only show the memory usage for individual processes. Apache often runs hundreds of processes, each of which may use only a small amount of memory, however the total memory consumed by all apache processes can be fairly large.Is there a way to see the total memory usage for all apache processes?

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General :: Centos - Which Command To Use To Know How Much RAM Consumed By Each Process

Jul 10, 2011

I have tried top and PS command but i am not able to find the RAM used by each command says that 240MB RAM used but the Memory shows 0% for all the processes, same with ps. i want to know which process consumes all 240MB RAM.Is there any command which / script which can sort the running process in oder of increasing RAM usage so that i can see. Also i find it very hard to read bytes and KB. Is there any to way to chnage those units to MB

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Programming :: PHP - Total Disk Quota For User

Nov 22, 2010

I am writing a php script and I need to find the total diskspace of a directory. I have used space already. I have a couple of different users with quotas
$path = "/home/" . ($_SERVER['PHP_AUTH_USER']);
$used = exec("du -c -a $path");
echo $used;
Will give me the disk space used. But I need total quota for that user.

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General :: Find The Only Particular User (usage) Of Memory Information?

Mar 29, 2011

how to find the only particular user (usage) of memory information

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Fedora :: User Memory Allocation - Set A Maximum Limit On The Amount Of Ram A User Can Utilize?

Jul 24, 2009

I have a few multi-user servers in an academic laboratory. I am having a problem with some users maxing out the available RAM, causing such sever slowdowns the machine essentially crashes. My servers are Dell Power Edge's running Ubuntu 8.10 Server Edition (Not my choice). I would like to set a maximum limit on the amount of ram a user can utilize. This morning I experimented with setting limits via /etc/security/limits.conf and using ulimit. Neither of them prevented my test program, a simple infinite loop of mallocs, from crashing the server.

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General :: Tools To View/edit User Space Memory Of Running Processes?

Nov 2, 2010

Are 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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Fedora Installation :: F13 Install Consumed Entire HD?

May 28, 2010

I had no problems installing the F13 DVD, but when I chose to install it across a 160 GB and 250 GB hard drives, it happily used both of them for the system and left me 40 GB of storage to play with.... at least I think that is what happened. I kind of had the opposite in mind. I know I could have installed it on one and used the other drive for a separate storage location, but for me, it's just easier to have one big storage/system volume and not have to worry about paths and /dev/sdb/images stuff

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Ubuntu :: Find Out Space Consumed By A Particular Application?

Aug 3, 2010

Is there any way to find out the space consumed by a particular application??
AFAIK,applications installation are distributed across various directories in Linux(man pages,executable files,etc..)and the very close i can get is to run 'whereis' command which gives me all the paths where the application's files are stored.
Do i have to manually go to each and every such paths and check their sizes??

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General :: How To Calculate Video Resolutions

Jun 2, 2011

I am familiar with common video resolutions like 320x240, 640x480 and 720x480. Sometimes I want to use other video resolutions when encoding videos. Is there a formula to calculate the unknown value for the heightxwidth if one value is supplied? For example, if I want my video to be 480xWidth, what value should Width be to get proper aspect.

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General :: Looping Through Csv File To Calculate Avg/min/max?

Sep 1, 2010

I have a csv file (id, loc, timestamp, impressions) that I need to derive some low-level calculations from. Im ok with basic sort and grep operations, but this one is challenging my feeble scripting skills (normally I�d throw it into a spreadsheet, but in this case Id like to ultimately create a script that I could automate). Ive already used cat/sort to order the csv file first on location and then timestamp so it looks like this:

Abt001, AA, 2009-01-01 10:51:00, 231
Cup002, AA, 2009-01-01 10:54:00, 3
Saf001, AB, 2009-01-01 10:51:00, 25


What Id like to do is output to file a record of the total, min, and max number of impressions for each location. , e.g.

AA6504 3231

how to do this and Im kind of stuck on how to approach it I think the combined steps of looping through the locations along with the min/max/sum calculations are throwing me. Eventually Id also like to do additional calculations like average, ect. but I think I can figure that out on my own if I can just get this part down.

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General :: Application Virtual Address Space Memory Allocation - Memory Does Not Get Free

Apr 20, 2010

I 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?)

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General :: Ubuntu - Memory Full, Process Memory Usage Doesn't Add Up In Top?

Mar 18, 2011

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.

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General :: Calculate Local Time In Seconds?

Sep 3, 2010

I`m looking to calculate my Local Time in seconds from APOC - 1970.I found only - date +%s -> that display the UTC and not my Local Time.

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General :: Calculate The Hours Usage Per Day Over A Certain Period?

Dec 13, 2010

Between the dates 21-June-2007 to 12-December-2010 there are 1270 days. If the total cumulative time a hard drive has been active is 344 days (found this via Disk Utility in Ubuntu 10.10) since it was bought 1270 days ago. What is the average usage hours per day?

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General :: Calculate Duration In Seconds In Bash ?

Nov 15, 2010

I would like to subtract the end time with a start time in bash. How can I do it?

Here's a script of example of what I want:

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