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From Aleksandar Ivanisevic <aleksan...@ivanisevic.de>
Subject Re: KahaDB latch wait warnings
Date Thu, 09 Dec 2010 08:38:11 GMT


Sure, AMQ-3076

Gary Tully <gary.tully@gmail.com>
writes:

> In the main, it is not important, that should be at debug or trace
> level logging or removed altogether, it is just an indication of the
> pagefile sync to disk latency and the amount of concurrent writes that
> are pending at the time, an remnant of some performance tuning work
> that was done for 5.4.0. the 100ms limit is arbitrary.
> Do u mind tracking this with a jira issue as it will probably come up again.
>
> On 8 December 2010 13:54, Aleksandar Ivanisevic
> <aleksandar@ivanisevic.de> wrote:
>>
>>
>> Just switched to kahadb on my amq 5.4.1 (fuse) and the log is filling
>> with this:
>>
>>
>> 2010-12-08 14:26:12,668 | WARN  | KahaDB PageFile flush: 3 queued writes, latch
wait took 119 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
>> 2010-12-08 14:28:03,769 | WARN  | KahaDB PageFile flush: 7 queued writes, latch
wait took 140 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
>> 2010-12-08 14:28:39,125 | WARN  | KahaDB PageFile flush: 3 queued writes, latch
wait took 112 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
>> 2010-12-08 14:30:04,928 | WARN  | KahaDB PageFile flush: 8 queued writes, latch
wait took 109 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
>> 2010-12-08 14:30:28,788 | WARN  | KahaDB PageFile flush: 8 queued writes, latch
wait took 18839 | org.apache.kahadb.page.PageFile | ActiveMQ Journal Checkpoint Worker
>>
>> quick code search turns out that this warning is fixed to 100ms
>>
>> http://bit.ly/gYH1Zu
>>
>> why 100ms and why is this important?
>>
>>
>>
>
>
>
> -- 
> http://blog.garytully.com
> http://fusesource.com
>

-- 
Ti si arogantan, prepotentan i peglaš vlastitu frustraciju. -- Ivan
Tišljar, hr.comp.os.linux


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