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2 votes
5 answers
139 views

Continuously monitor a process and all its children with `top`?

I want to run a process that spawns children, e.g., for i in {1..4}; do sh -c 'echo $$; for j in {1..3}; do sh -c "echo ...\$\$; sleep 1" done' done and I would like to monitor the ...
wobtax's user avatar
  • 318
0 votes
2 answers
72 views

why is all this swap space being used?

I have a Debian box, where I am doing some data recovery using ddrescue on a sata ssd. The process has been running for 24 hours, and has 24 to go (at least) in any event, the PC has 16GB ram, and ...
j0h's user avatar
  • 3,689
1 vote
0 answers
37 views

mysqld thread count exceeds max_connections

As the question title suggests: I have set max_connections = 2 in my my.cnf file, but when I activate my mysql daemon, the thread count sits at 37. I am searching online but cannot find indication my ...
user10709800's user avatar
0 votes
1 answer
33 views

QNX resource manager full duplex or half duplex

I am using a resource manager to read the data from the communication channel and send it to the application. I have doubt, is the QNX resource manager half duplex or full duplex? Can simultaneous ...
sagar's user avatar
  • 3
1 vote
1 answer
522 views

HP Pavilion x360 Convertible, installing Linux, endless IRQ and logging loop

When installing a Linux OS (e.g. Mint) from a live cd or USB stick, editing /etc/default/grub does not solve the problem. You can add or edit a line like GRUB_CMDLINE_LINUX_DEFAULT="quiet splash ...
Ruud Harmsen's user avatar
3 votes
1 answer
429 views

Is the kilobyte used by time and ulimit commands either 1000 (SI) or 1024 (old school) bytes?

From man time: M Maximum resident set size of the process during its lifetime, in Kilobytes. From ulimit -a: max memory size (kbytes, -m) unlimited But a "kilobyte" may mean ...
abukaj's user avatar
  • 165
0 votes
2 answers
543 views

Will `rm -rf` continue deleting if it can't delete something in the middle?

Consider a dir garbage containing many files and directories. If I run rm -rf garbage, but some files or directories within garbage are busy by the OS/NFS/etc., so rm -rf will fail for them. Will it ...
Serge Rogatch's user avatar
0 votes
1 answer
875 views

sleep in Bash if/else sleep vs <condition> && sleep clamining cpu

I wrote a script to check on the battery and if it is below 5% notify the user. The script is put to sleep for 1 minute after every check. If I write the script in the following way, the cpu workload ...
jeykey's user avatar
  • 33
0 votes
1 answer
4k views

JAVA OPTS Xms Xmx MetaspaceSize MaxMetaspaceSize relationship with server resources

I have just started working with jboss application servers and recently we had a problem when trying to deploy an application in a new test server (RHEL 7), it happened that, when starting the jboss ...
miguel ramires's user avatar
0 votes
0 answers
504 views

Memory runs out and PC freezes

I have been having issues playing video games on my PC, as I keep running out of RAM (8GB). When I run out of RAM, my displays and everything else freezes, except playing audio keeps looping. I have ...
tempacc's user avatar
  • 317
0 votes
1 answer
29 views

Changing rights and owner in one command to safe resources

I have a backup script with the following function: function change_rights() { chown -R ${OWNER}:${GROUP} ${DIR} find ${DIR} -type f -exec chmod 0640 {} \; find ${DIR} -type d -exec chmod ...
manifestor's user avatar
  • 2,483
2 votes
0 answers
524 views

Is there a program that will show me the average CPU usage over the last minute for every process?

One feature I miss from Windows is that the Resource Monitor program would show, among other statistics, the average CPU usage over the last minute for each program. On Linux I use either Gnome system ...
A. Kriegman's user avatar
2 votes
1 answer
427 views

Get memory/cpu usage by application

What I need I want to monitor system resources (namely memory and cpu usage) by application - not just by process. Just as the Windows Task Manager is grouping resources by the "calling mother ...
Y. Shallow's user avatar
2 votes
1 answer
1k views

systemd ignores drop-in configuration files - what am I doing wrong?

On one of my machines with Debian Buster (which ships systemd 241), I wanted to watch resource usage via systemd-cgtop. When I started this utility, I was seeing memory usage, but neither CPU usage ...
Binarus's user avatar
  • 3,440
1 vote
0 answers
555 views

How to determine whether a process would run out-of-memory?

A testsuite has a couple of tests, that will consume a quite a lot of memory (11GB) or so. This is typically not a problem when running those tests on my developer machine, but within the context of ...
umläute's user avatar
  • 6,482
-1 votes
1 answer
183 views

Why can't http be changed to https in ubuntu?

Why can't http be changed to https in ubuntu? Err:1 https://ports.ubuntu.com/ubuntu-ports focal InRelease Could not connect to ports.ubuntu.com:443 (91.189.91.38). - connect (111: Connection refused)...
user487583's user avatar
0 votes
1 answer
549 views

How to know how many resources a process uses in all its execution time? linux

I would like to know if there is a program to analyze how many resources it takes to execute a command. for example as follows: # magic_program python3 app.py And that the program tells you how many ...
fraco_oxza's user avatar
0 votes
1 answer
423 views

How to get the correct device to limit block IO for docker container?

(I posted this question at stackoverflow, but maybe here is the more appropriate place, if necessary - I'll delete the other question.) I need to put a limit on block IO operations speed for a number ...
gai-jin's user avatar
  • 135
1 vote
0 answers
40 views

Hide HOST resources from a docker container [duplicate]

I have a linux server with 100GB of RAM & 56Cores, I run a docker container with limit in Memory and CPU and I use cgroups too (I limited Memory & CPU to 50GB & 20Cores). With all that ...
Saeed Bibak's user avatar
6 votes
3 answers
3k views

What is the historical reason for limits on file descriptors (ulimit -n)

When I first borrowed an account on a UNIX system in 1990, the file limit was an astonishing 1024, so I never really saw that as a problem. Today 30 years later the (soft) limit is a measly 1024. I ...
Ole Tange's user avatar
  • 35.8k
2 votes
0 answers
27 views

System too busy for magic SysRq [duplicate]

Sometimes (perhaps once a month) my system stops responding so bad that it won't react to magic SysRq combinations (which are allowed and do work properly at all other times). I'm quite sure this is ...
The Vee's user avatar
  • 310
0 votes
0 answers
121 views

Limiting the resources used by a process

This is now the third time I've had this problem and had to look up how to do it with the specific caveats of my particular instance. As such I want to write a script that will go through all the ...
LambdaBeta's user avatar
0 votes
2 answers
408 views

massive resource consumption during mkfs.ntfs on a zvol, why (and how can I limit this)?

On my machine mkfs.ntfs is slow and results in massive use of resources, preventing me from using the machine for anything else. According to top it (or rather directly related zvol processes) is ...
Stonecraft's user avatar
1 vote
1 answer
1k views

Systemd resource limits not working as expected

I'm running Ubuntu 20.04 with systemd 245. I'm testing out systemd's resource control features; particularly the memory usage controls. The relevant section of my unit file looks like this: [Unit] ...
jezza's user avatar
  • 138
0 votes
1 answer
241 views

Relationship between RAM and CPU to assign to servers

I would like to know if there is any method, formula, recommendation or good practice to establish the relationship between CPU and RAM on a server, be it physical or virtual, I have recently seen ...
miguel ramires's user avatar
0 votes
1 answer
262 views

Systemd resource management via CGroup

I want to know how can I limit ( or eliminate any limitation for ) the resource consumption (i.e CPU and memory usage ) of systemd slices via CGroup ? There's a command named systemd-cgtop which ...
Parsa Mousavi's user avatar
2 votes
0 answers
78 views

drm/kms: Limit graphics memory usage of process

Is there a way to limit the amount of graphics resources allocated by a process in the DRM/KMS subsystem, similar to the way one can limit system memory consumption with rlimits and cgroups? Is there ...
novice's user avatar
  • 429
1 vote
1 answer
256 views

Do context switches take up memory?

I’m relatively new to Linux, and I had a few questions about context switching. What kind of system resources does a context switch take up? Does it take up memory? If so, will the memory show up as ...
Ramsey Alsheikh's user avatar
1 vote
0 answers
2k views

Multiple Processes getting stopped with error “Resource temporarily unavailable” and “can't fork” resulting in crash

We are running a script on Dell Edge gateway 3002 to send data to cloud, but after running for 4-5 days the gateway becomes unresponsive(hanged state) and can't be pinged. The gateway has Ubuntu 18.04....
Prototype's user avatar
1 vote
0 answers
32 views

How to measure the resource use of a system call?

I've written two system calls, and want to compare the memory used up by each one. How could I go about doing this? I've tried getrusage, but almost all of the fields are 0. Thank you!
Ramsey Alsheikh's user avatar
1 vote
0 answers
312 views

Compiling a program causes my system to run out of memory, any workarounds?

During the compilation my system runs out of memory on a compilation unit. How can I deal with this issue? One way is to enable swap but just doing that would make the machine unuable while the ...
saga's user avatar
  • 1,401
2 votes
0 answers
48 views

Where is getrusage defined? [duplicate]

I've been looking into the getrusage function, which I see a prototype for within the file /include/linux/resource.h. I've tried to trace the directives to find where the actual function is, but I ...
Ramsey Alsheikh's user avatar
0 votes
0 answers
35 views

What deteriorating component in my laptop is causing poor performance while playing videos

I have a laptop which I have been using for years. I was always able to watch Youtube videos and hours-long HD videos stored on my hard drive just fine. However, recently the device started poorly ...
cablewelo2ma's user avatar
2 votes
2 answers
836 views

Who would win, RLIMIT_NPROC or user namespaces?

Depending on configuration, unprivileged (non-root) processes can create a user namespace. RLIMIT_NPROC limits the number of processes per user. If I enter a user namespace, can I create processes ...
sourcejedi's user avatar
  • 51.1k
1 vote
0 answers
30 views

Launch a program to only specific resources

Question: How can I launch a program such that it only uses X ram and Y CPU cores, etc? I happen to be using Ubuntu in this case, but since I often am on other distros, I need a general GNU/Linux ...
wblan's user avatar
  • 11
0 votes
0 answers
142 views

how to determine the impact of an running application on system load average due to CPU resource usage?

As of my knowledge Linux system load average is affected by any means that can affect the system like CPU resource usage, memory consumption, disk I/O, network I/O etc. In top command I am checking ...
AYUSH SENAPATI's user avatar
1 vote
1 answer
410 views

Is this really the official website for DirectFB?

The README document in the DirectFB source tarball lists the official website as www.directfb.org; however, that site seems rather ... odd, to say the least. It starts off talking about Linux, but ...
Time4Tea's user avatar
  • 2,405
2 votes
0 answers
3k views

Why is this `dd` command producing `Resource busy` errors?

I'm attempting to recover anything possible from a known-bad hard disk (failing, or failed). I began with dd and realized I didn't unmount. After unmounting volumes, I was able to correctly begin the ...
user3.1415927's user avatar
17 votes
1 answer
2k views

Is it wrong to think of "memfd"s as accounted "to the process that owns the file"?

https://dvdhrm.wordpress.com/2014/06/10/memfd_create2/ Theoretically, you could achieve [memfd_create()] behavior without introducing new syscalls, like this: int fd = open("/tmp", O_RDWR | ...
sourcejedi's user avatar
  • 51.1k
3 votes
1 answer
278 views

Is there a command or a serie of commands to make the computer use as much resources as possible?

I am looking for one or possibly more commands, or a combination of commands, to get my PC to use as much resources as possible. I want to check how my computer behaves when subject to the maximum ...
chalky's user avatar
  • 33
3 votes
2 answers
12k views

pcs cluster not moving resource when instructed to move

for whatever reason I'm no more able to move resources with pcs pacemaker-1.1.16-12.el7_4.8.x86_64 corosync-2.4.0-9.el7_4.2.x86_64 pcs-0.9.158-6.el7.centos.1.x86_64 Linux server_a.test.local 3.10.0-...
yesOrMaybeWhatever's user avatar
3 votes
1 answer
804 views

What could be using 6GB of my swap?

I have a mystery: what is using 6GB of my swap? My kernel version is 4.15.9-300.fc27.x86_64. This happened following some crashes. dmesg shows I had a segfault in a gnome-shell process (which ...
sourcejedi's user avatar
  • 51.1k
2 votes
1 answer
934 views

systemd shows as reading 300M in atop?

I just installed atop, waited half an hour, and looked at the logs with atop -r /var/log/atop/atop_20180216. Why does my systemd --user instance show hundreds of megs of disk usage, including tens of ...
sourcejedi's user avatar
  • 51.1k
1 vote
0 answers
126 views

systemd resource management (specific case: mysql)

I have a problem tying to figure out, how the resource management in systemd works. To make clear where I am and how I got there, I should start with explaining my situation: After migrating a mysql-...
rohr's user avatar
  • 156
2 votes
3 answers
17k views

Increasing open files limit for all processes: Do I need to set Soft/Hard limits?

I'm trying to fix the following error that I get after a day or two of running my game server. 2017/12/13 12:08:35 http: Accept error: accept tcp [::]:8081: accept4: too many open files; retrying in ...
SJ19's user avatar
  • 121
2 votes
1 answer
243 views

How does Qubes do memory management, especially with regard to shared objects?

I'm just reading about Qubes OS, and I have a very simple question -- how does it do memory management and shared object use? Feel free to correct any misconceptions or errs in vocab, but we have the ...
Evan Carroll's user avatar
  • 31.8k
0 votes
1 answer
1k views

Get size of multiple folders - How to calculate server resources consumption of the process?

I need to get the size of multiple folders (with subfolders and several files) and update a database, in order to limit the users upload to my server. This process must be done periodically, in the ...
Guybrush's user avatar
  • 155
1 vote
0 answers
68 views

Limit a process or users physical memory share

I have a system running many processes on behalf of other users. Virtual memory space with 64bit operating systems is less of a concern, but my users will still often use up all the physical memory ...
Fire Lancer's user avatar
6 votes
2 answers
1k views

Prevent a script exhausing system resources and crashing entire system

I was thinking if there is "canonical" way to have this? Background & description I have to install some program on live server. Although I do trust the vendor (FOSS, Github, multiple ...
Miloš Đakonović's user avatar
3 votes
1 answer
71 views

Docker user executing a process cannot be removed

I have some resources used by a specific user that I had to delete because it was taking a lot of resources from the server. When I listed the processes in the server the deleted user now shows as “...
VaTo's user avatar
  • 3,191