On Sun, 2011-05-08 at 09:47 +0300, Nadav Har'El wrote: > On Sat, May 07, 2011, Omer Zak wrote about "Re: Disk I/O as a bottleneck?": > > I suspect that speeding up /usr won't help improve performance that > > much. The applications, which seem to be sluggish, deal with a lot of > > user data in /home. Furthermore, this user data varies a lot with time, > > hence it is not that good idea to store it in SSD. > > As usual, "it depends on your workload" applies. > > In my own personal experience (and naturally, it might differ considerably > from your use case), when I see "sluggish behavior" on a desktop machine, > what is actually happening is that "foreground" activity, such as playing or > working with video files, or such as compilation of a large project, causes > a lot of other pages to be swapped out; And then, when you switch to a > different application, it needs to swap pages in - either program text (code) > directly from the executables, or data pages from the swap partition.
I explicitly checked whether my PC is swapping or not (vmstat 1) and it was not. The sluggish behavior was not due to any RAM shortage. The contents of /proc/sys/vm/swappiness are: 60 I did find (using iostat -x -k 1) that both /usr and /home are heavily used (and %util hits 100% for both of them). In my PC they are in separate partitions but on the same hard disk (which is managed by LVM with encryption, except for a smallish boot partition). [OFFTOPIC] It was great experience to see all this thread resulting from my single posting. I can understand how it comes that some people enjoy trolling mailing lists. </wicked_grin> --- Omer -- We live in a world of stupid people who enjoy being stupid. My own blog is at http://www.zak.co.il/tddpirate/ My opinions, as expressed in this E-mail message, are mine alone. They do not represent the official policy of any organization with which I may be affiliated in any way. WARNING TO SPAMMERS: at http://www.zak.co.il/spamwarning.html _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
