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List:       lustre-discuss
Subject:    [Lustre-discuss] Number of processes in Lustre tunable?
From:       srramasw () cisco ! com (Sridharan Ramaswamy (srramasw))
Date:       2007-01-23 11:39:58
Message-ID: B14199FA0DBAAF4AA89E83EB41D3543502EAE702 () xmb-sjc-22c ! amer ! cisco ! com
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I'm tring to measure the overhead of having Lustre on the system.  Among
other things, I noticed it starts lot of processes,
 
root      4565     1  0 Jan03 ?        00:00:00 [ll_mdt_attr_14]
root      4636     1  0 Jan03 ?        00:00:01 [ll_ost_13]
root      4651     1  0 Jan03 ?        00:00:08 [ll_ost_io_13]
root      4550     1  0 Jan03 ?        00:00:03 [ll_mdt_14]
root      4516     1  0 Jan03 ?        00:00:00 [ldlm_cb_31]

I can account about 200 processes related to Lustre on an OST node. That
seems a lot considering we would like to run other applications on the
same node. Is it possible to tune these number of processes down? Say
reduce 32 ldlm process to about 8. What kind of performance degradation
to expect if we can do that?
 
thanks,
Sridharan
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