When I check graphics process on Ubuntu system. I see gfx_0.0.0 as a process.
ps -ef | grep -i gfx
root 760 2 0 Jan13 ? 00:03:01 [gfx_0.0.0]
I am not running any application but still since system bootup I observe this process.
Can anyone please help me to understand what exactly gfx_0.0.0 process ? How it is getting created?
ps -ef | grep -i gfx
root 760 2 0 Jan13 ? 00:03:01 [gfx_0.0.0]
Trying to understand what is this process and who is creating it and why?
Related
I'm running RHEL (kernel 4.1.12) with Docker (1.12.1) and my docker service dockerd became a zombie [dockerd] <defunct> with PID 412
# ps -a | grep dockerd
1 412 412 412 ? -1 Zsl 0 23:28 [dockerd] <defunct>
and it holds resources, in particular a device 251:4 (/dev/dm-4) which is a Device Mapper managed:
# dmsetup ls
docker-251:0-6815748-pool (251:1)
docker-251:0-6815748-e97dd950.......59a691feaf6 (251:4)
# lsof | grep 251,4
dockerd 412 6844 root 1257u BLK 251,4 0t0 2439769 /dev/dm-4
as a result, removing the thin entry docker-251:0-6815748-e97dd950.......59a691feaf6 fails
# dmsetup remove docker-251:0-6815748-e97dd950.......59a691feaf6
device-mapper: remove ioctl on docker-251:0-6815748-e97dd950.......59a691feaf6 failed: Device or resource busy
Command failed
Any suggestions how to cleanup the leftovers of the docker service (e.g., all the DM entries) besides restarting the whole system?
Is it really possible that a zombie process holds resources?
$ jcmd -l
418 sun.tools.jcmd.JCmd -l
$ jstat -gcutil -t 10 250ms 1
10 not found
I am aware of the bug in jdk related to attaching jstat as root to a process running as a different user.
Here, this docker container has one user root and as can be seen below from the ps command, cassandra is running under root.
$ whoami
root
I have tried to do the following:
$ sudo -u root jcmd -l
Any help is appreciated.
Docker container is debian:jessie
running java version:
openjdk version "1.8.0_66-internal"
Here's the output of ps -ef:
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 17:40 ? 00:00:00 /bin/bash /run.sh
root 10 1 11 17:40 ? 00:02:25 java -ea -javaagent:/usr/share/c
root 375 0 0 17:49 ? 00:00:00 bash
root 451 375 0 18:00 ? 00:00:00 ps -ef
Aside: jstack successfully dumps out the stack traces of the threads.
I know at least two possible reasons why this can happen.
Java is run with -XX:+PerfDisableSharedMem option. This option helps sometimes to reduce JVM safepoint pauses, but it also makes JVM invisible to jps and jstat. This is a very likely case, because you are running Cassandra, and recent Cassandra has this option ON by default.
Java process has a different mount namespace, so that /tmp of Java process is not physically the same directory as /tmp of your shell. The directory /tmp/hsperfdata_root must be accessible in order to use jps or jstat. This is also a plausible reason since you are using docker containers.
I know if I type ps -ef I get the processes. But how can I read the process tree of a user say xyz, so that I can draw it in hierarchal form?
Should I read the file path towards process and draw it as a tree structure? Or what?
Here is a selection from a larger ps -ef output:
UID PID PPID C STIME TTY TIME CMD
....
xyz 15152 15112 0 23:08:00 pts/19 0:00 usr/bin/bash
xyz 15112 15106 0 23:07:54 ? 0:00 /local/openssh/4.5p1/sbin/sshd -R
root 236 6535 0 21:27:06 ? 0:01 /local/openssh/4.5p1/sbin/sshd -R
xyz 15431 15152 0 23:09:30 pts/19 0:00 ps -ef
.....
How can I draw the process hierarchy of xyz?
Thanks
pstree [options] [pid or username];
see http://www.linfo.org/pstree.html and http://manpages.ubuntu.com/manpages/precise/man1/pstree.1.html
You can use htop -u USERNAME and then press F5
Does anyone know how to use procps-3.2.8 in listing all the running processes of ubuntu/linux?
And how to kill them using procps-3.2.8?
please provide the step-by-step procedure and provide useful links about procps.
procps is the package which contains the many command line utility provided. You can find the complete information about each utility option under the procpcs from the below location:
On the homepage we can get the following information about procps:
procps is the package that has a bunch of small useful utilities that give information about processes using the /proc filesystem. The
package includes the programs ps, top, vmstat, w, kill, free, slabtop,
and skill.*
http://www.linuxfromscratch.org/lfs/view/7.2/chapter06/procps.html
http://procps.sourceforge.net/
How to use procps-3.2.8 in listing all the running processes?
ps is the part of procps package and there are numerous ways to list the all running process(For detailed information do man ps).
mantosh#mantosh4u:~/practice$ ps -V
procps version 3.2.8
mantosh#mantosh4u:~/practice$ ps -AF
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
root 1 0 0 6143 2544 3 14:38 ? 00:00:00 /sbin/init
root 2 0 0 0 0 1 14:38 ? 00:00:00 [kthreadd]
.............................................................................
root 3320 2 0 0 0 0 15:13 ? 00:00:00 [kworker/u:2]
root 3334 2 0 0 0 1 15:18 ? 00:00:00 [kworker/1:0]
How to kill them using procps-3.2.8?
pkill is part of procps package which contains numerous command line option to kill a process. For detailed information man pkill on your terminal.
mantosh#mantosh4u:~/practice$ pkill -V
pkill (procps version 3.2.8)
mantosh#mantosh4u:~/practice$ pkill -f gedit
In the above example, the gedit was the process name which has been killed.
I'm running a java process (doing some database manipulations) and I ran ps -lp 5631232
F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
202001 A 205 5631232 263213 0 60 20 3f46b46120 70156 * pts/6 1:09 java
the 'TIME' has not been changed for a long while. The status is A (active), so I think it didn't halt.
I just don't know how can I find out what's going wrong out there? Anyone can tell me how to detect the problem and/or what could be the problem?
I'm using AIX system.