[Lustre-discuss] Lustre Debug level

[Wojciech Turek]

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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>> Lustre-discuss at clusterfs.com
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>

Mr Wojciech Turek
Assistant System Manager
University of Cambridge
High Performance Computing service
email: wjt27 at cam.ac.uk
tel. +441223763517



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