[GE users] fairshare fairness

Ron Chen ron_chen_123 at yahoo.com
Fri Feb 11 01:02:37 GMT 2005


May be I am asking a stupid question...

Is SGE running in SGEEE mode (can you take a look at
the product_mode file)?

 -Ron

--- Mike Brown <Michael.Brown at motorola.com> wrote:
>   I've got a question about fairshare under the
> share tree only policy. 
>  I'm running 5.3p5.
> 
> Suppose two users exist, and each should have 50%
> cpu time.  User A's 
> jobs are long, and User B's jobs are short.  If the
> queues are full of 
> User A's jobs and User B starts submitting jobs, the
> share tree should 
> allow 50% (suppose CF=1) of cpu time to User B.  
> 
> It seems like SGE only allocates every other job to
> User B (instead of 
> equal cpu time).  Since B's jobs are shorter, User A
> still gets the 
> majority of cpu time, which is unfair.  If we set
> CF=0, User B will 
> dominate the queues until usage is balanced, which
> is undesirable.  If 
> we set CF >> 1, we either under- or over-favor B
> depending on the ratio 
> of A and B's job lengths.
> 
> I'd like to give user B a short term allowance of
> 75%, though in this 
> case, giving B 75% by job is not fair.  How can this
> be accomplished?
> 
> Thanks,
> 
> Mike
> 
> 
> 
>
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