James <wirel...@tampabay.rr.com> [14-12-06 18:16]: > <meino.cramer <at> gmx.de> writes: > > > > on different systems I see the write stats (/proc/dikstats) to > > physical existing disks steadily increasing. > > Looking at the output of lsof I cannot find any file suspicous > > for receiving those writes. > > Ok so in my experiences you need a (2) pronged approach. > > (1) Then pursue quantifying with tools just what is causing the > writes, strategies for minimization and monitoring as needed. > > So folks are going down path (1) with you, that is fine. > > (2) First minimize those write to your non-mechanical memory. > > Path (2) > on any and all minimized gentoo or embedded gentoo systems, > I start out with USE="-*" to keep things minimum. Yea that tweaks the > devs now, but minimal system are just that, minimized, imho, so that > is a firm standard I always operation on. Set the minimum > number of global flags and the thinest profile that will work for > your system. Every flag invokes more code and hence more processes, > more files, more writing to media. > > Also, all log files should be written off the embeded system via > NFS or other similar mechanisms. > > If you want further help, put up a document where folks can spend > $20 and get a similar board up and running embedded gentoo. Then > they can see exactly what you see have and you can work as a team, or not, > your call. > > I have dozens of tricks to minimize a gentoo system. But it is quite > a bit of work, just so you know. It's not a do this and it great. It > more like, try this, study the result and then alter the strategy. > > hth, > James >
Hi, thank you very for all help I received regarding my question. The system is already down to a limit. The by default running processes are: root 1 0 0 15:36 ? 00:00:00 init [3] root 2 0 0 15:36 ? 00:00:00 [kthreadd] root 3 2 0 15:36 ? 00:00:01 [ksoftirqd/0] root 5 2 0 15:36 ? 00:00:00 [kworker/0:0H] root 7 2 0 15:36 ? 00:00:00 [khelper] root 8 2 0 15:36 ? 00:00:00 [kdevtmpfs] root 160 2 0 15:36 ? 00:00:00 [writeback] root 162 2 0 15:36 ? 00:00:00 [crypto] root 164 2 0 15:36 ? 00:00:00 [bioset] root 166 2 0 15:36 ? 00:00:00 [kblockd] root 168 2 0 15:36 ? 00:00:00 [cfg80211] root 169 2 0 15:36 ? 00:00:00 [kworker/0:1] root 280 2 0 15:36 ? 00:00:00 [kswapd0] root 296 2 0 15:36 ? 00:00:00 [fsnotify_mark] root 372 2 0 15:36 ? 00:00:00 [ipv6_addrconf] root 398 2 0 15:36 ? 00:00:00 [deferwq] root 406 2 0 15:36 ? 00:00:12 [mmcqd/0] root 412 2 0 15:36 ? 00:00:00 [kworker/0:2] root 415 2 0 15:36 ? 00:00:00 [jbd2/mmcblk0p2-] root 416 2 0 15:36 ? 00:00:00 [ext4-rsv-conver] root 563 1 0 15:37 ? 00:00:00 /lib/systemd/systemd-udevd --daemon root 952 1 0 15:37 ? 00:00:00 /usr/sbin/ifplugd --iface=usb0 root 1380 1 0 15:37 ? 00:00:00 /usr/sbin/sshd root 1399 1 0 15:37 tty1 00:00:00 /sbin/agetty 38400 tty1 linux root 1400 1 0 15:37 tty2 00:00:00 /sbin/agetty 38400 tty2 linux root 1401 1 0 15:37 tty3 00:00:00 /sbin/agetty 38400 tty3 linux root 1402 1 0 15:37 tty4 00:00:00 /sbin/agetty 38400 tty4 linux root 1403 1 0 15:37 tty5 00:00:00 /sbin/agetty 38400 tty5 linux root 1404 1 0 15:37 tty6 00:00:00 /sbin/agetty 38400 tty6 linux root 1405 1 0 15:37 ttyS0 00:00:00 /sbin/agetty -L 9600 ttyS0 vt100 root 1406 1380 0 15:37 ? 00:00:02 sshd: root@pts/0 root 1412 1406 0 15:37 pts/0 00:00:00 screen -R -d root 1414 1412 0 15:37 ? 00:00:01 SCREEN -R -d root 1415 1414 0 15:37 pts/1 00:00:05 -/bin/zsh root 1434 2 0 15:38 ? 00:00:00 [kworker/0:1H] root 1866 2 0 15:43 ? 00:00:00 [kworker/u2:0] root 8556 2 0 16:49 ? 00:00:00 [kworker/u2:2] The count of getty processes may be decreaseable...but the rest is ok, I think. When I do a ftop I get no process, which have an open file handle for writes...sometimes screen writes to utmp but thats it. I suspect the swapfile I mounted as swapdevice for being guilty. I will deactivate that and we will see then. When looking at /proc/diskstats: Will I see writes to FIFOs on the disk as writes to the disk??? If YES...it would explain it... Best regards, Meino
