[SOLVED] per process disk usage

alesz · 10-11-2005, 03:22 AM

My disk is bottle neck of my system too many times.

How could I see per-process disk usage (writing, reading, time spent for I/O for disk?)?
It can be a CLI or GUI program.

freakyg · 10-11-2005, 08:32 PM

Quote:

Originally posted by alesz
My disk is bottle neck of my system too many times.

is DMA enabled?? try this

Code:

hdparm -Tt /dev/hdxx

Emmanuel_uk · 10-12-2005, 12:58 AM

there is a tutorial knocking around on iostat and vmstat about bottleneck,
it was in linuxjournal I think, it might even be on LQ
because if I remember well Jeremy wrote it.
Anyhow, iostat (and maybe vmstat) might be what you need

alesz if you google for it and it meet your need, why not put
the link back in this thread

alesz · 10-12-2005, 07:15 AM

I did the hdparm test again, as also before posting the first post.

The test is 3x repeated for accurate results.

Code:

# hdparm -Tt /dev/hdb

/dev/hdb:
 Timing cached reads:   1848 MB in  2.00 seconds = 922.30 MB/sec
 Timing buffered disk reads:  102 MB in  3.05 seconds =  33.47 MB/sec

# hdparm -Tt /dev/hdb

/dev/hdb:
 Timing cached reads:   1872 MB in  2.00 seconds = 934.74 MB/sec
 Timing buffered disk reads:   94 MB in  3.02 seconds =  31.14 MB/sec
# hdparm -Tt /dev/hdb

/dev/hdb:
 Timing cached reads:   1856 MB in  2.00 seconds = 928.14 MB/sec
 Timing buffered disk reads:   88 MB in  3.02 seconds =  29.18 MB/sec

The DMA is enabled:

Code:

 
# hdparm -d /dev/hdb

/dev/hdb:
 using_dma    =  1 (on)

Could it be the filesystem (ext3?)? The swap is sometimes even empty when the bottle neck occurs.

I have a Fedora Core 4 system, which is mostly compiled against i386, but the kernel is compiled against i686.
Is it a kernel problem, disk problem or a configuration problem?

When more processes use the disk, the scheduling algorithm for disk access goes nuts and the response times are pretty bad. Is there a way to set per process disk or i/o priority?

Answer to Emmanuel_uk:
The article link about iostat is
http://www.linuxquestions.org/questi...icle&artid=532
Another good utility for i/o monitoring is sar: it displays %iowait per daily intervals every 10 minutes.

But I still can't see per process i/o usage.

Emmanuel_uk · 10-26-2005, 04:47 AM

lsof /dev/hda
or
lsof -p process id

Combined with bash + awk + grep + ls
If you sum the relevant file size

it should give you the total disk usage per process

Can you please post the script here if you go that way.
I am sure people will comment / help / improve / test it

regards

avangel · 12-03-2010, 11:02 PM

This thread seems to be quite old, but with no meaningful answer.
iotop seems to be the right tool.
For ubuntu you can install it by 'sudo apt-get install iotop'.
I found it by the 3rd google hit for "linux disk usage by process":
http : // reviewhubs . com /linuxtips/2009/06/iotop-howto-find-disk-usage-of-each.html
I put spaces to the url so that I can post this message.

syg00 · 12-04-2010, 12:00 AM

Welcome to LQ - but you'll find yourself unpopular waking up "dead" threads.

Iotop relies on taskstats - which wasn't merged into the mainline kernel until 2007. Hence was/is irrelevant to a 2005 thread.
Search LQ and you will find several threads on iotop.