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Monitoring CPU and RAM Usage (linux-dash and alternatives)
I have had a RN104, (OS 6.4.2), for some time now but have often thought that it was running a bit slow. For example I have DVBLink TV Server installed and when opening it up from another device it o...
That was just my opinion. It isn't bogus or misleading, just only so much the little Marvell Armada CPU can do :) Honestly, has I said it serves up my media files perfectly. I just found running some of the varous apps (Plex, the Virus scan, pigwo, and enabling iTunes or DNLA) running at the same time while trying to access the files via Plex (streaming mkv files) it isn't effient and uses a lot of CPU. That is why I mentioned running top and saving the output so you can see the CPU use and Waits.
The way we have it set up is probably simple but more or less it is the centralized storage for our home. All of our computers back up to it. It also serves our media (Music and Movies) via Plex. Plex is running on Ubuntu and NFS mounting the NAS shares. Once a week the 104 sends its data to another PC in the house with lots of storage who shoots it up to Crashplan. Documents, photos, computer backups, and music mostly - I don't back up the movies since I have the physical media still.
Down the road I'm sure I'll expand my Ubuntu server with a raid card and ZFS or some other files system/RAID and remove the 104 since it would be significantly faster with regards to disk I/O and network. But so far NAS to TV or other streaming device it is ok and I can tolerate the 20 - 30MB/Sec transfer rate it seems to see when transferring files.
So yeah, it is good at one or two things but not for running Plex or some of the more CPU intensive applications while also serving up media. I think that is pretty fair to say. It really comes down to the CPU and Memory amount it has as the limiting factor.
The load average on my RN102 is between 0.1 and 0.2 when the NAS is idling. That is using 6.5.0-T338 beta firmware, and is measured with top.
Sorry, I don't understand - what does "measured with top" mean?
What does load average between 0.1 and 0.2 equate to? (10 to 20% CPU usage ??).
Do you have any services such as DVBLink TV Server or Logitech Media Server running in the background?
Paul608085 wrote:
Sorry, I don't understand - what does "measured with top" mean?
top is a standard linux command line tool - http://linux.about.com/od/commands/l/blcmdl1_top.htm
What does load average between 0.1 and 0.2 equate to? (10 to 20% CPU usage ??).
No. It's not directly related to CPU usage. It's the average number of processes either using the CPU or queued up waiting for the CPU.
http://www.howtogeek.com/194642/understanding-the-load-average-on-linux-and-other-unix-like-systems/
Do you have any services such as DVBLink TV Server or Logitech Media Server running in the background?
Plex is installed/running and the iTunes server is enabled enabled.
OK, now I think I understand: "Top" is a tool built in to the ReadyNAS operating system?
I SSH'd in and ran Top and this is the result, (when idling):
top - 19:30:46 up 19:24, 3 users, load average: 9.48, 9.12, 8.37
Tasks: 148 total, 1 running, 147 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.3 us, 0.7 sy, 0.0 ni, 99.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 508680 total, 480724 used, 27956 free, 268 buffers
KiB Swap: 523708 total, 1180 used, 522528 free, 102272 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12386 root 20 0 5440 2580 2212 R 0.5 0.5 0:01.32 top
2735 root 20 0 106m 2680 732 S 0.2 0.5 3:32.63 leafp2p
3317 squeezeb 20 0 117m 94m 2364 S 0.2 19.0 4:18.39 squeezeboxserve
4852 root 20 0 0 0 0 S 0.2 0.0 0:08.60 kworker/0:1
12369 root 20 0 10416 4724 4084 S 0.2 0.9 0:00.33 sshd
1 root 20 0 7272 2024 480 S 0.0 0.4 0:09.56 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreaddAll other commands shown had 0% for both CPU and memory.
What do the "load averages" of 9.48, 9.12 and 8.37 actually mean? They seem to be a lot higher than your 0.1 to 0.2.
I tried to explain what the stat means. At any point in time there can be 0-x processes either using the CPU or waiting for their turn to use it. That's the load. The load average is simply the average value of x. The total CPU utilitization is about 1% in your system, even though the load average is much higher.
The new kernel in 6.5.0 might be a factor in my load average being lower than yours. My number in the past was much higher, but I don't recall when that changed.
Are you seeing performance problems?
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