[Bug 282704] KDE 4.7 is very slow on ext3 root partition

[zanetu at live.com]

https://bugs.kde.org/show_bug.cgi?id=282704

--- Comment #30 from zanetu at live.com ---
(In reply to comment #29)
> Can you execute the followings commands as root to see what kind of I/O and
> what processes are causing it?
> 
> before you start the slow process (or KDE session)
> 
> echo 1 > /proc/sys/vm/block_dump
> 
> after it is running
> 
> dmesg | awk '/READ/ {sub(/\(.*\):/,"",$2); print $2}' | sort | uniq -c |
> sort -rn | head
> dmesg | awk '/WRITE/ {sub(/\(.*\):/,"",$2); print $2}' | sort | uniq -c |
> sort -rn | head
> dmesg | awk '/dirtied/ {sub(/\(.*\):/,"",$2); print $2}' | sort | uniq -c |
> sort -rn | head
> dmesg | awk '/WRITE|READ|dirtied/ {sub(/\(.*\):/,"",$2); print $2}' | sort |
> uniq -c | sort -rn | head
> echo 0 > /proc/sys/vm/block_dump
> 
> to know the processes to blame. 
> NOTE: If you not see program names, only numbers, replace $2 with $3.
> 
> seen at
> http://balajitheone.blogspot.com.es/2011/04/io-wait-load-tracking-to-process.
> html
> 
> The main problem with this bug is that there are no tools to know where are
> the I/O bottlenecks in a program (or I do not know any). (just like
> callgrind but for I/O)
> Therefore, we do not know (yet) if this is for opening/closing a lot of
> files, syncing files, or ...

# echo 1 > /proc/sys/vm/block_dump
# dmesg | awk '/READ/ {sub(/\(.*\):/,"",$3); print $3}' | sort | uniq -c | sort
-rn | head
    152 chrome
    149 knotify4
    117 Chrome_FileThre
     64 Chrome_DBThread
     63 firefox-bin
     51 Chrome_CacheThr
     36 Chrome_SafeBrow
     19 PAC
      4 Chrome_IOThread
      1 Chrome_ProcessL
# dmesg | awk '/WRITE/ {sub(/\(.*\):/,"",$3); print $3}' | sort | uniq -c |
sort -rn | head
    210 kjournald
    174 flush-8:0
     57 firefox-bin
      5 konsole
      3 rs:main
      1 chrome-sandbox
# dmesg | awk '/dirtied/ {sub(/\(.*\):/,"",$3); print $3}' | sort | uniq -c |
sort -rn | head
    253 chrome-sandbox
     93 knotify4
     54 Chrome_FileThre
      7 Chrome_CacheThr
      5 firefox-bin
      1 Chrome_DBThread
# dmesg | awk '/WRITE|READ|dirtied/ {sub(/\(.*\):/,"",$3); print $3}' | sort |
uniq -c | sort -rn | head
   1212 kjournald
    170 flush-8:0
    120 Chrome_SyncThre
    112 Chrome_FileThre
     33 Chrome_HistoryT
     25 Chrome_DBThread
     18 chrome
     12 firefox-bin
      5 Chrome_CacheThr
      2 WorkerPool/6761
# echo 0 > /proc/sys/vm/block_dump

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