How can I get high precision memory usage per proccess with "ps aux"?
$ ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 3672 1984 ? Ss Dec11 0:07 /sbin/init
root 2 0.0 0.0 0 0 ? S Dec11 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Dec11 0:23 [ksoftirqd/0]
root 6 0.0 0.0 0 0 ? S Dec11 0:00 [migration/0]
...
I need more than 1 digit after point.
Maybe I can format column with %MEM?
Look into the proc filesystem /proc/[pid]/status, /proc/[pid]/statm, /proc/[pid]/smaps.
To get fully detailed memory map /proc/[pid]/maps
Read the proc(5) manual page for all the details.
the ps command have that. you can type man ps for detail.
when the termianl show info after you typed it, you can type /memory , then heighlight contain 'memory''s string. you can type n show next palace with memory.
Related
I notice some process always have VSZ as 0
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 19356 1400 ? Ss Jun13 0:00 /sbin/init
root 2 0.0 0.0 0 0 ? S Jun13 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Jun13 0:00 [migration/0]
root 4 0.0 0.0 0 0 ? S Jun13 0:01 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S Jun13 0:00 [stopper/0]
root 6 0.0 0.0 0 0 ? S Jun13 0:03 [watchdog/0]
root 7 0.0 0.0 0 0 ? S Jun13 0:00 [migration/1]
how to understand why they have 0 VSZ?
VSZ is the Virtual Memory Size. It includes all memory that the process can access, including memory that is swapped out, memory that is allocated, but not used, and memory that is from shared libraries.
So, the top command screenshot you shared showing VSZ values equaling 0, means that those processes are not using VSZ.
NOTE: They are kernel threads and memory statistics are irrelevant for them as they use kernel memory. Just to visualize kernel processes, press c when top command is running and it will show you all [bracketed] entries in last column named COMMAND.
You can get more details on VSZ and learn about its counterpart RSS (Resident Set Size) from here.
Memory occupied by unknown (VMware/CentOS)
Hello.
We have a server that has memory full used issue, but can not find what is eating memory.
Usage of memory has increased few days ago 40% -> neary 100% and stayed there since then.
We’d like to kill whatever eating memory.
[Env]
cat /etc/redhat-release
CentOS release 6.5 (Final)
# arch
x86_64
[status]
#free
total used free shared buffers cached
Mem: 16334148 15682368 651780 0 10168 398956
-/+ buffers/cache: 15273244 1060904
Swap: 8388600 129948 8258652
Result of top (some info are masked with ???)
#top -a
top - 10:19:14 up 49 days, 11:13, 1 user, load average: 1.05, 1.05, 1.10
Tasks: 145 total, 1 running, 143 sleeping, 0 stopped, 1 zombie
Cpu(s): 11.1%us, 18.4%sy, 0.0%ni, 69.5%id, 0.8%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 16334148k total, 15684824k used, 649324k free, 9988k buffers
Swap: 8388600k total, 129948k used, 8258652k free, 387824k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
17940 ??? 20 0 7461m 6.5g 6364 S 16.6 41.5 1113:27 java
4982 ??? 20 0 941m 531m 5756 S 2.7 3.3 611:22.48 java
3213 root 20 0 2057m 354m 2084 S 99.8 2.2 988:43.79 python
28270 ??? 20 0 835m 157m 5464 S 0.0 1.0 106:48.55 java
1648 root 20 0 197m 10m 1452 S 0.0 0.1 42:35.95 python
1200 root 20 0 246m 7452 808 S 0.0 0.0 2:37.42 rsyslogd
Processes that are using memory (some info are masked with ???)
# ps aux --sort rss
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1200 0.0 0.0 251968 7452 ? Sl Sep12 2:37 /sbin/rsyslogd -i /var/run/syslogd.pid -c 5
root 1648 0.0 0.0 202268 10604 ? Ss Sep12 42:36 /usr/lib64/???
??? 28270 0.1 0.9 855932 161092 ? Sl Sep14 106:49 /usr/java/???
root 3213 96.1 2.0 2107704 332932 ? Ssl Oct31 992:25 /usr/lib64/???
??? 4982 0.8 3.3 964096 544328 ? Sl Sep12 611:25 /usr/java/???
??? 17940 6.6 41.5 7649356 6781076 ? Sl Oct20 1113:49 /usr/java/???
Memory is almost 100% used, but with ps and top, we can only find processes that uses half of it.
We have checked slab cache, but it was not the cause.
Slab is only 90444 kB.
Nothing is found in syslog too.
Anyone has any idea how to detect what is eating memory?
Thank you in advance.
Run free -m and see the difference. Column available shows real free memory.
And take a look at the https://www.linuxatemyram.com/
we have restarted server and solved this case.
An important topic in software deveopment / programming is to assess the size of the product, and to match the application footprint to the system where it is running. One may need to optimize the product, and/or one may need to add more memory, use a faster processor, etc. In the case of virtual machines, it is important to make sure the application will work effectively by perhaps making the VM memory size larger, or allow a product to get more resources from the hypervisor when needed and available.
The linux top(1) command is great, with its ability to sort by different fields, add optional fields, highlight sort criteria on-screen, and switch sort field with < and >. On most systems though, there are very many processes running, making "at-a-glance" examination a little difficult. Consider:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ PPID SWAP nFLT COMMAND
2181 root 20 0 7565m 3.2g 7028 S 2.7 58.3 86:41.17 1 317m 10k java
1751 root 20 0 137m 2492 1056 S 0.0 0.0 0:02.57 1 5104 76 munin-node
11598 postgres 20 0 146m 23m 11m S 0.0 0.4 7:51.63 2143 3600 28 postmaster
1470 root 20 0 243m 1792 820 S 0.0 0.0 0:01.89 1 2396 23 rsyslogd
3107 postgres 20 0 146m 26m 11m S 0.0 0.5 7:40.61 2143 936 58 postmaster
3168 postgres 20 0 132m 14m 11m S 0.0 0.2 8:27.27 2143 904 53 postmaster
3057 postgres 20 0 138m 19m 11m S 0.0 0.3 6:55.63 2143 856 36 postmaster
3128 root 20 0 85376 900 896 S 0.0 0.0 0:00.11 1636 852 2 sshd
1728 root 20 0 80860 1080 952 S 0.0 0.0 0:00.61 1 776 0 master
3130 manager 20 0 85532 844 672 S 0.0 0.0 0:01.03 3128 712 36 sshd
436 root 16 -4 11052 264 260 S 0.0 0.0 0:00.01 1 688 0 udevd
2211 root 18 -2 11048 220 216 S 0.0 0.0 0:00.00 436 684 0 udevd
2212 root 18 -2 11048 220 216 S 0.0 0.0 0:00.00 436 684 0 udevd
1636 root 20 0 66176 524 436 S 0.0 0.0 0:00.12 1 620 25 sshd
1486 root 20 0 229m 2000 1648 S 0.0 0.0 0:00.79 1485 596 116 sssd_be
2306 postgres 20 0 131m 11m 9m S 0.0 0.2 0:01.21 2143 572 64 postmaster
3055 postgres 20 0 135m 16m 11m S 0.0 0.3 10:18.88 2143 560 36 postmaster
...etc... This is for about 20 processes, but there are well over 100 processes.
In this example I was sorting by SWAP field.
I would like to be able to aggregate related processes based on the "process group" of which they are a part, or based on the USER running the process, or based on the COMMAND being run. Essentially I want to:
Aggregate by PPID, or
Aggregate by USER, or
Aggregate by COMMAND, or
Turn off aggregation
This would allow me to see more quickly what is going on. The expectation is that all the postgres processes would show up together, as a single line, with process group leader (2143, not captured in the snippet) displaying aggegated metrics. Generally the aggregation would be a sum (VIRT, RES, SHR, %CPU, %MEM, TIME+, SWAP, nFLT), but sometimes not (as for PR and NI, which might be shown as just --).
For processes whose PPID is 1, it would be nice to have an option of toggling between aggregating them all together, or of leaving them listed individually.
Aggegation by the name of the process (java vs. munin-node, vs. postmaster, vs. chrome) would also be a nice option. The COMMAND arguments would not be used when aggregating by command name.
This would be very valuable when tuning an application. How can I do this, aggregating top data for at-a-glance viewing in larger scale systems? Has anyone written an app, perhaps that uses top in batch mode, to create a summary view like I'm discussing?
FYI, I'm specifically interest in something for CentOS, but this would be helpful on any OS variant.
Thanks!
...Alan
I'm new to linux.
How can I show a list of all processes that says about each process if it's running or suspended?
I've tried
ps -ef|grep myusername
but it doesn't say if the processes are running or not.
also tried
ps ux
same thing, it doesn't say if the processes are running or not.
I'm looking for something like this list:
I get this list when I move a process to background, I don't know how to see it otherwise...
You can use "ps" to list processes, This (ps aux) will list all the processes. Given an example output of it below.
ps aux | more
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.1 189160 9376 ? Ss 15:51 0:04 /usr/lib/systemd/systemd --switched-root --system --deserialize 20
root 2 0.0 0.0 0 0 ? S 15:51 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S 15:51 0:00 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S< 15:51 0:00 [kworker/0:0H]
root 7 0.0 0.0 0 0 ? S 15:51 0:06 [rcu_sched]
root 8 0.0 0.0 0 0 ? S 15:51 0:00 [rcu_bh]
root 9 0.0 0.0 0 0 ? S 15:51 0:04 [rcuos/0]
By checking the STAT of the process ( UNDER "STAT" ) you can identify the process states, Below are some possible states codes.
R running or runnable (on run queue)
D uninterruptible sleep (usually IO)
S interruptible sleep (waiting for an event to complete)
Z defunct/zombie, terminated but not reaped by its parent
T stopped, either by a job control signal or because it is being
traced
You can type "man ps" to get more info.
You can use htop to see the list of processes and there is a column for process state
What does a C process status mean in htop?
http://www.howtogeek.com/howto/ubuntu/using-htop-to-monitor-system-processes-on-linux/
ps -p PID -o comm=
Enter the code above where PID is PID of the process.
Following command will be more helpful to you.
Use the command : sudo lsof -i -n -P
This command lists the Application Name, PID, User, IP version, Device ID and the Node with Port Name. It shows both TCP and UDP.
Variations :
To format it in a nice, readable way; use :
sudo lsof -i -n -P | more
To view view only TCP connections :
sudo lsof -i -n -P | grep TCP | more
To view view only UDP connections :
sudo lsof -i -n -P | grep UDP | more
I want to make a Linux application that send a message to a remote host when a local system (where the application runs) is going to suspend, hibernate or shutdown. I googled how to do this and found acpi_listen but it doesn't work.
Here is the result of ps aux | grep acpi on the system I tested (Ubuntu 10.04 LTS):
root 35 0.0 0.0 0 0 ? S Dec03 0:00 [kacpid]
root 36 0.0 0.0 0 0 ? S Dec03 0:00 [kacpi_notify]
root 37 0.0 0.0 0 0 ? S Dec03 0:00 [kacpi_hotplug]
root 934 0.0 0.0 2048 872 ? Ss Dec03 0:00 acpid -c /etc/acpi/events -s /var/run/acpid.socket
Communicating with acpid directly via a UNIX domain socket wouldn't work since that's the way acpi_listen works, although I didn't try it. Is there any other way?
Listen for them over D-Bus.