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From sub3 <st...@subwest.com>
Subject Re: Under IO Load
Date Tue, 12 Aug 2008 12:32:52 GMT

Software installed on C:
Heavy I/O is happening on E:

C: is 10k 74gb drive
E: is 2 15k 750gb drives, raid 0
It is an HP server, w/2 xeon cpus. I don't remember the speed, but it is
about a year old.
It is running Windows 2003 server w/ over 8 gigs of ram.  We never have a
memory problem.

Hope that helps.   Thanks.



elihusmails wrote:
> 
> what is your hardware configuration?
> 
> 
> On Mon, Aug 11, 2008 at 8:23 PM, sub3 <steve@subwest.com> wrote:
> 
>>
>> Sorry, that last sentence sounds wrong, let me restate:
>> When I run several of those Test.java programs I attached, ActiveMQ
>> stops.
>> W/o these running ActiveMQ is fine.
>> So I don't know if it is a system resource issue, if so, what?
>> Or it is a condition that only arises when the system is bogged down with
>> i/o.
>>
>> Any insight would be appreciated. Thanks.
>>
>>
>> sub3 wrote:
>> >
>> > That is correct.  The processes that are performing the i/o on the disk
>> > are separate jvms.  It is not the same as the components using
>> ActiveMQ.
>> > They high i/o usage are somehow causing ActiveMQ to stop.  I've run
>> many
>> > tests, with and without them running, ActiveMQ halts w/o any
>> > warnings/errors & it never recovers.
>> >
>> >
>> > elihusmails wrote:
>> >>
>> >> So if I understand this right, you are sending messages to ActiveMQ
>> while
>> >> performing I/O, and ActiveMQ is not performing any I/O (other than
>> >> caching
>> >> of data) since you are not persisting any data.
>> >>
>> >> Is this true?
>> >>
>> >>
>> >>
>> >> On Mon, Aug 11, 2008 at 5:08 PM, sub3 <steve@subwest.com> wrote:
>> >>
>> >>>
>> >>> I have a system where 1 is sending to several (a & b) and
>> occasionally
>> b
>> >>> sends to c (all queues).  Very simple.  Persistence is set to false.
>> >>> Queue
>> >>> sizes are capped at 50mb.
>> >>>
>> >>> If I put the system under a heavy i/o load (several programs
>> >>> reading/writing
>> >>> lots of files), ActiveMQ will stop.
>> >>>
>> >>> Am I hitting some system resource issue here, and if so, what is it?
>> >>> Also,
>> >>> is there a way to get ActiveMQ to recover?
>> >>>
>> >>> I've attached my activemq.xml file, and a sample program to create
>> i/o
>> >>> load
>> >>> (sometime I run several of these).  I am running on Windows Server
>> 2003.
>> >>>
>> >>> Thanks.
>> >>> http://www.nabble.com/file/p18933907/activemq.xml activemq.xml
>> >>> http://www.nabble.com/file/p18933907/Test.java Test.java
>> >>> --
>> >>> View this message in context:
>> >>> http://www.nabble.com/Under-IO-Load-tp18933907p18933907.html
>> >>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Under-IO-Load-tp18933907p18936148.html
>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>
>>
> 
> 

-- 
View this message in context: http://www.nabble.com/Under-IO-Load-tp18933907p18943417.html
Sent from the ActiveMQ - User mailing list archive at Nabble.com.


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