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--- linux:tips [2009/07/23 15:48]
193.164.137.40 Limit the CPU usage of an application (process) - cpulimit
+++ linux:tips [2015/05/08 12:09] (current)
zagi
@@ Line 118: / Line 118: @@
 This will cleanly unmount drives, terminate processes and nicely reboot your machine.
+<note important>**If you suspect memory corruption killed your kernel, be careful with Sync option. It may flush corrupted disk buffers over your filesystem and cause more headache after reboot.**</note>
 **also for more detailed info see:** [[http://en.wikipedia.org/wiki/Magic_SysRq_key]]
@@ Line 300: / Line 302: @@
    * If you want kernel to swap out more process memory and thus cache more file contents increase the value. Otherwise, if you would like kernel to swap less decrease it.
    * More info [[http://lwn.net/Articles/83588/|2.6 swapping behavior]]
+Example:
+   * ''swappiness=0'' tells the kernel to avoid swapping processes out of physical memory for as long as possible
+   * ''swappiness=100'' tells the kernel to aggressively swap processes out of physical memory and move them to swap cache
+   * A value of ''swappiness=10'' is recommended, but feel free to experiment.
 ===== Getting rid of that obsolete delay after password authentication =====
@@ Line 352: / Line 360: @@
 If you have a reliable server with a good RAID card and power supply, you could set the dirty_ratio to 100 and the dirty_background_ratio to 1. This was recommended by a buddy of mine who runs quite a few servers running virtual machines.
+===== convert files from ISO to UTF-8 ====
+<code>
+for x in `find . -name '*.htm'` ; do iconv -f ISO-8859-2 -t UTF-8 $x > "$x.utf8"; rm $x; mv "$x.utf8" $x; done
+</code>
 ===== How do I force users to change their passwords upon first login? =====