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Re: [Condor-users] controlling memory intensive jobs
- Date: Mon, 9 Nov 2009 09:56:38 +0000
- From: Matt Hope <Matt.Hope@xxxxxxxxxxxxxxx>
- Subject: Re: [Condor-users] controlling memory intensive jobs
The idea is that you have one 'true' slot (which is partitionable) which is defined in config and that then is capable of forming multiple dynamic slots.
The SLOT_TYPE_X_PARTITIONABLE would allow the more compelx case where you might want, say 3 slots, and two of them to be static.
thus, on an 8 core box,
# only need a small amount of memory and one core but should be always available
SLOT_TYPE_1 = cpus=1, ram=256
NUM_SLOTS_TYPE_1 = 2
# the partionable slot, I could leave all these at auto if need be
SLOT_TYPE_2 = cpus=6, memory=auto
SLOT_TYPE_2_PARTITIONABLE = True
NUM_SLOTS_TYPE_2 = 1
In the case you describe you don't need to bother with any of this, you would appear to only need one partitionable slot and that's it.
From: condor-users-bounces@xxxxxxxxxxx [mailto:condor-users-bounces@xxxxxxxxxxx] On Behalf Of Mag Gam
Sent: 07 November 2009 03:41
To: Condor-Users Mail List
Subject: Re: [Condor-users] controlling memory intensive jobs
I am curious about your dynamic policies now. At our lab these servers
are keep having memory problems .
I looked at http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.1/html/Grid_User_Guide/chap-Grid_User_Guide-Dynamic_provisioning.html
and tried to setup dynamic provision.
I have a question about, SLOT_TYPE_X_PARTITIONABLE
What is "X" ? Do i need to do do this in my configuration?
for a 15 core box?
Also, do I also need to do this:
I have done condor_status -l but I don't see DynamicSlot=TRUE
On Thu, Sep 24, 2009 at 9:37 AM, Ian Chesal <ICHESAL@xxxxxxxxxx> wrote:
>> We have 10 servers which have 64GB of memory with 16 cores. We don't
>> want to have people to run all of their memory intensive jobs at once
>> since it would crash the box. What do condor admins typically do to
>> control this? so only 10 jobs runs on 10 different servers?
> I make all my users tell me up front how much memory their job needs to
> run. It's a rough guess, but enough to make sure Condor doesn't schedule
> too many memory intensive jobs on my machines. In the back end I bin the
> memory request so jobs are in one of 5 memory size estimate buckets.
> This makes them easier to deal with when planning machine setups. I
> don't allocate my machine resources evenly across slots. I unbalance
> them unpurpose to service the 5 bins of memory requirements accordingly.
> It can be less efficient if all the jobs in your queue are in the
> largest memory bin -- you end up with slots that are allocated with too
> little memory to run these going unused. But it's better than having
> jobs fail. And it'll hold until dynamic machine partitioning is
> mainstream in Condor.
> - Ian
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