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Re: multiple access bog down on HP-UX 11i

From: Ryan Hunt <rhunt_at_hp.com>
Date: 2003-11-13 02:40:46 CET

And some more info...
After running a svnadmin recover, future transactions again assume the
run state rather than the sleep state.

Would this indicate that importing simultaneous with a checkout will
cause database corruption?

-Ryan

On Wednesday, November 12, 2003, at 06:00 PM, Ryan Hunt wrote:

> So I have some more information on this problem.
>
> I have say 9 checkouts occurring simultaneously. Load is up to around
> 10. Each process has about 9-10% CPU, and has a state of run. Files
> are being written to the clients at about 30MB per min.
>
> As soon as I start an import for a 10th simultaneous svnserve process
> all process assume the sleep state and drop down to 1% CPU or less.
> Load drops to 1-2.
>
> The import is killed mid stream. All remaining svnserve processes
> performing the checkouts remain in sleep state. While in sleep state
> files are written to the clients at a rate that nonexistent.
>
> Any ideas on why this might occur and how to prevent it?
>
> -Ryan
>
> On Tuesday, November 11, 2003, at 05:35 PM, Ryan Hunt wrote:
>
>> I am running my repository on an HP-UX 11i system using the svn+ssh
>> access method.
>>
>> When 2 separate users start 4 simultaneous checkouts each for a total
>> of 8 checkouts, and a 3rd user initiates an import, the import grinds
>> to a halt, and the checkouts proceed at a rate of .5MB per hour.
>>
>> Each transaction ranges in total size from 200MB to 2.5GB with the
>> largest file size being 600MB.
>>
>> After all the transactions are canceled and another transaction is
>> initiated the same slow pace is achieved.
>>
>> To revive the speed a reboot is required.
>>
>> Load never goes above 1.5, and no resources seem over taxed: disk
>> I/O, memory, CPU all seem fine.
>>
>> Does anyone have any ideas or suggestions to allow multiple
>> simultaneous large transactions??
>>
>> Ryan
>>
>>
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Received on Thu Nov 13 02:39:41 2003

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