I found there is some problem with SLE problem: each time I am
copying large files into removable disk or I am tar some big files, the
whole system became very slow: almost all the program and windows stuck
there… No matter how well (I get a 24 CPU (3.6 GHZ), 32 GB memory
workstation) is my CPU or memory is, the problem always happen. I don’t
install beagle and compiz in my system.
I found there is some problem with SLE problem: each time I am
copying large files into removable disk or I am tar some big files,
the whole system became very slow: almost all the program and windows
stuck there… No matter how well (I get a 24 CPU (3.6 GHZ), 32 GB
memory workstation) is my CPU or memory is, the problem always
happen. I don’t install beagle and compiz in my system.
How to solve this problem ?
THX
[/color]
Hi
Sounds like I/O rather than CPU/RAM. How are you transferring to
removable disk, USB eSATA? How fast are the hard drives in your system,
10K RPM or SSD?
Exactly. The main bottleneck of almost every system in the world is
I/O. When your system is busy using the disk, especially when it is
reading from it (to get the files) and writing to it (to create the tar)
at the same time your system will seem slow because of that bottleneck
no matter how much RAM or how many CPUs you have.
When you’re sitting at a stoplight (waiting on something else) it
doesn’t matter how fast your car goes or how much your pickup can carry;
the stop light is going to keep you from getting anything done.
I found there is some problem with SLE problem: each time I am
copying large files into removable disk or I am tar some big files,
the whole system became very slow: almost all the program and windows
stuck there… No matter how well (I get a 24 CPU (3.6 GHZ), 32 GB
memory workstation) is my CPU or memory is, the problem always
happen. I don’t install beagle and compiz in my system.
How to solve this problem ?
THX
[/color]
Hi
Sounds like I/O rather than CPU/RAM. How are you transferring to
removable disk, USB eSATA? How fast are the hard drives in your system,
10K RPM or SSD?
my disk is 7200 rpm. I use USB removable disk for copying files. But I
don’t understand even I tar the files or untar files in local machine,
the whole system becomes very slow. Is there any methods to solve this
problem?
Exactly. The main bottleneck of almost every system in the world is
I/O. When your system is busy using the disk, especially when it is
reading from it (to get the files) and writing to it (to create the
tar)
at the same time your system will seem slow because of that bottleneck
no matter how much RAM or how many CPUs you have.
When you’re sitting at a stoplight (waiting on something else) it
doesn’t matter how fast your car goes or how much your pickup can
carry;
the stop light is going to keep you from getting anything done.
Good luck.
Want to yell at me in person?
Come to BrainShare 2011 in October: http://tinyurl.com/brainshare2011
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.15 (GNU/Linux)
Comment: Using GnuPG with Mozilla - ‘Enigmail: A simple interface for
OpenPGP email security’ (http://enigmail.mozdev.org/)
It does, but you don’t notice it because windows is slow all of the
time.
If you really think it doesn’t happen in windows you’re really not
looking. I/O is a constant in the computing world… it’s inherent with
all kinds of things and especially disks with moving (spinning) parts.
Exactly. The main bottleneck of almost every system in the world is
I/O. When your system is busy using the disk, especially when it is
reading from it (to get the files) and writing to it (to create the
tar)
at the same time your system will seem slow because of that
bottleneck no matter how much RAM or how many CPUs you have.
When you’re sitting at a stoplight (waiting on something else) it
doesn’t matter how fast your car goes or how much your pickup can
carry;
the stop light is going to keep you from getting anything done.
Good luck.
Want to yell at me in person?
Come to BrainShare 2011 in October: http://tinyurl.com/brainshare2011 -----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.15 (GNU/Linux)
Comment: Using GnuPG with Mozilla - ‘Enigmail: A simple interface
for OpenPGP email security’ (http://enigmail.mozdev.org/)
How are you objectively measuring the slowness of the system
before/during/after the tar operation?
[/color]
before the tar operations, everything goes well: I can do any
operations I want such as edit document. However, when I tar/untar
something big, my mouse stuck there and software windows become
white… I can’t do any operations anymore until the tar/untar
finished.
The only time I’ve seen behaviour like you describe was about five years
ago no a machine that was old enough to have a PATA harddisk and DMA had
somehow been disabled. The system was hopelessly unresponsive when there
was any significant disk access going on. Given the specs you mentioned
I very much doubt you have a PATA harddisk though.
What does this give you?
Code:
$ for i in {1…5};do hdparm -t /dev/sda;done
I get figures of around 80 MB/sec.
This sounds like an issue that could be very difficult to diagnose.
Have you considered raising a Service Request with Novell?
Are you using tar operation on removable or on physical disk? With file
system are you using?
Do you anytime check the value “%wa = waiting operation” in the top
during tar or coping? If is bigger then “%id” there is possible mistake
in the disk partitioning.
I had these problem with 4096-Byte Sector Hard Drives, and it sound
very similar. Witch OS create the partitions? If windows, that can
be problem.
Are you using tar operation on removable or on physical disk? With file
system are you using?
Do you anytime check the value “%wa = waiting operation” in the top
during tar or coping? If is bigger then “%id” there is possible mistake
in the disk partitioning.
I had these problem with 4096-Byte Sector Hard Drives, and it sound
very similar. Witch OS create the partitions? If windows, that can
be problem. ;-)[/color]
Thank you very much for kind reply. I do the tar operation in physical
disk and I use ext3 which is the same with removable disk. someone
suggest me to use this command to check something, but I don’t know
what’s that:
