Date: Tue, 31 Aug 2004 22:05:00 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: freebsd-stable@freebsd.org Cc: das@FreeBSD.org Subject: Re: vnodes - is there a leak? where are they going? Message-ID: <20040831215959.D31538@ganymede.hub.org> In-Reply-To: <20040831214524.P31538@ganymede.hub.org> References: <20040831205907.O31538@ganymede.hub.org> <20040831214524.P31538@ganymede.hub.org>
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Hrmmm, maybe I'm mis-reading all of this, and going down the wrong paths
here, so hopefully someone will correct if I am ... but, for now ...
Looking at vmstat -m a bit further, the top of the report has:
Memory statistics by bucket size
Size In Use Free Requests HighWater Couldfree
16 13116 28356 2063580697 1280 7822
32 77734 7002 168084205 640 316065
64 465006 48402 2804541088 320 637084
128 100182 60010 591859866 160 1850304
256 500029 12163 1178322001 80 123078
Now, the only things that are using alot of the '256 Size' memory are:
FFS node494513123629K 127870K204800K401104542 0 0 256
vfscache449709 29178K 32434K204800K737673766 0 0 64,128,256,512K
Since only 500029 are 'InUse', and since FFS node is exclusively 256 ...
I'm going to guess that most of vfscache is using something else ... so,
my question becomes if 123000 'Could be Freed', why aren't they?
Assuming, of course, I'm not on the wrong trail here :(
On Tue, 31 Aug 2004, Marc G. Fournier wrote:
>
> As a follow up, looking at vmstat -m .. specifically the work that David did
> on seperating the union vs regular vnodes:
>
> UNION mount 60 2K 3K204800K 162 0 0 32
> undcac 0 0K 1K204800K343638713 0 0 16
> unpath 13146 227K 1025K204800K 43541149 0 0 16,32,64,128
> Export Host 1 1K 1K204800K 164 0 0 256
> vnodes 141 7K 8K204800K 613 0 0
16,32,64,128,256
>
> Why does 'vnodes' show only 141 InUse? Or, in this case, should I be looking
> at:
>
> FFS node496600124150K 127870K204800K401059293 0 0 256
>
> 496k FFS nodes, if I'm reading right?
>
> vs neptune, which is showing only:
>
> FFS node300433 75109K 80257K204800K 3875307 0 0 256
>
>
>
> On Tue, 31 Aug 2004, Marc G. Fournier wrote:
>
>>
>> I have two servers, both running 4.10 of within a few days (Aug 5 for
>> venus, Aug 7 for neptune) ... both running jail environments ... one with
>> ~60 running, the other with ~80 ... the one with 60 has been running for
>> ~25 days now, and is at the border of running out of vnodes:
>>
>> Aug 31 20:58:00 venus root: debug.numvnodes: 519920 - debug.freevnodes:
>> 11058 - debug.vnlru_nowhere: 256463 - vlrup
>> Aug 31 20:59:01 venus root: debug.numvnodes: 519920 - debug.freevnodes:
>> 13155 - debug.vnlru_nowhere: 256482 - vlrup
>> Aug 31 21:00:03 venus root: debug.numvnodes: 519920 - debug.freevnodes:
>> 13092 - debug.vnlru_nowhere: 256482 - vlruwt
>>
>> while the other one has been up for ~1 days, but is using alot less, for
>> more processes:
>>
>> Aug 31 20:58:00 neptune root: debug.numvnodes: 344062 - debug.freevnodes:
>> 208655 - debug.vnlru_nowhere: 0 - vlruwt
>> Aug 31 20:59:00 neptune root: debug.numvnodes: 344062 - debug.freevnodes:
>> 208602 - debug.vnlru_nowhere: 0 - vlruwt
>> Aug 31 21:00:03 neptune root: debug.numvnodes: 344062 - debug.freevnodes:
>> 208319 - debug.vnlru_nowhere: 0 - vlruwt
>>
>> I've tried shutting down all of the VMs on venus, and umount'd all of the
>> unionfs mounts, as well as the one nfs mount we have ... the above #s are
>> after the VMs (and mounts are recreated ...
>>
>> Now, my understanding of the vnodes is that for every file opened, a vnode
>> is created ... in my case, since I'm using unionfs, there are two vnodes
>> per file ... if it possible that there are 'stale' vnodes that aren't being
>> freed up? Is there some way of 'viewing' the vnode structure?
>>
>> For instance, fstat shows:
>>
>> venus# fstat | wc -l
>> 19531
>>
>> So, obviously it isn't just open files that I'm dealing with here, for even
>> if I double that, that is nowhere near 519920 ...
>>
>> So, where else are the vnodes going? Is there a 'leak'? What can I look
>> at to try and narrow this down / provide more information?
>>
>> Even some way of determining a specific process that is sucking back alot
>> of them, to move that to a different machine ... ?
>>
>> Help?
>>
>> ----
>> Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
>> Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
>>
>
> ----
> Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
> Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
>
----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664
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