Hi Cliff,
Thanks for exhaustive answer.
Is that mean that in lustre 1.6.3 by default debug level is set for
production lustre?
Do you have any suggestions what I could "turn off" to get better
performance?
Cheers,
Wojciech
On 16 Nov 2007, at 17:10, Cliff White wrote:
Wojciech Turek wrote:
Hi,
Lustre manual 1.6 v18 says that that in production lustre debug
level should be set to fairly low. Manual also says that I can
verify that level by running following commands:
# sysctl portals.debug
This gives ne following error
error: 'portals.debug' is an unknown key
Sigh. This is another error in the manual. As you might suspect,
the correct answer is 'lnet.debug'
# sysctl lnet.debug
lnet.debug = ioctl neterror warning error emerg ha config console
cat /proc/sys/lnet/debug
gives output:
ioctl neterror warning error emerg ha config console
cat /proc/sys/lnet/subsystem_debug
undefined mdc mds osc ost class log llite rpc lnet lnd pinger
filter echo ldlm lov lmv sec gss mgc mgs fid fld
manual says that in order to set reasonable production debug level
one need to put numeric value into debug files like below:
echo 0x3f0400 > /proc/sys/lnet/debug
Will this work under lustre 1.6.3 or maybe it is old reference
from 1.4 release and there is new way of changing lustre debug
level in new releases?
The hex bitmasks will work with 1.6.3, however we have added nice
human-readable strings. '-1' will
still set all values 'on' and is a simple way to see the entire list..
# echo -1 > /proc/sys/lnet/debug
# cat /proc/sys/lnet/debug
trace inode super ext2 malloc cache info ioctl neterror net warning
buffs other dentry nettrace page dlmtrace error emerg ha rpctrace
vfstrace reada mmap config console quota sec
# echo "ioctl neterror warning error emerg ha config console" > /
proc/sys/lnet/debug
# cat /proc/sys/lnet/debug
ioctl neterror warning error emerg ha config console
cliffw
Thanks,
Wojciech Turek
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Mr Wojciech Turek
Assistant System Manager
University of Cambridge
High Performance Computing service
email: [EMAIL PROTECTED]
tel. +441223763517
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