Something is very wrong with disk caching in 7.0

Martin Nilsson martin at gneto.com
Sat Aug 6 08:21:35 GMT 2005


Julian Elischer wrote:
> Martin Nilsson wrote:
> 
>> Martin Nilsson wrote:
>>
>>  >
>>  > This can't be rigt, why are active processes swapped out just to use
>>  > the memory for caching a file that is written to once! The box have
>>  > 2.5GB memory, it should be plenty for this!
>>
>>
>>
>> Some serching reveals that this is the same bug as Julian found 07/28.
>> Re:  VFS/VM over-runs. Was: Apparent strange disk behaviour in 6.0
> 
> 
> there is a patch that helps with this problem in testing, It helps
> in teh case where there is just 1 huge file pushing everything else out
> but if there is another problem that affects the system when there
> are multiple files doing IO then in may not help..
> It is not clear whether you experience the problem with 1 single
> file or with many small files being written to.

My problems are with one big file, the database in the first test is
mostly one big table with 20 million rows. In the second test the big
10GB ibdata file is what causes it.


> 
>>
>> Who is working on this? It should be put on the TODO for 6.0 so it's 
>> not lost.
>>
>> /Martin
>>
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