Re: [Moosefs-users] mfsmaster performance and hardware

[Robert S. <rsa...@ne...>]

Increasing the swap space fixed the fork() issue. It seems that you have 
to ensure that memory available is always double the memory needed by 
mfsmaster. None of the swap space was used over the last 24 hours.

This did solve the extreme comb-like behavior of mfsmaster. It still 
does not resolve its sensitivity to load on the server. I am still 
seeing timeouts on the chunkservers and mounts on the hour due to the 
high CPU and I/O load when the meta data is dumped to disk. It did 
however decrease significantly.

An example from the logs:

Aug  9 04:03:38 http-lb-1 mfsmount[13288]: master: tcp recv error: 
ETIMEDOUT (Operation timed out) (1)
Aug  9 04:03:39 http-lb-1 mfsmount[13288]: master: register error (read 
header: ETIMEDOUT (Operation timed out))
Aug  9 04:03:41 http-lb-1 mfsmount[13288]: registered to master

Robert

On 8/9/11 12:39 PM, Elliot Finley wrote:
> On Tue, Aug 9, 2011 at 5:50 AM, Robert Sandilands<rsa...@ne...>  wrote:
>> On 8/9/11 12:56 AM, Elliot Finley wrote:
>>> Just out of curiosity, what OS are you using?
>>>
>>> Elliot
>> Linux (Centos 5.6 64-bit).
>>
>> Robert
>>
> If/when you get the fork working, please let us (the list) know what it took.
>
> Elliot