openstack team mailing list archive

[Sandy Walsh <sandy.walsh@xxxxxxxxxxxxx>]

Was the db on a separate server or loopback?

On 03/23/2012 05:26 PM, Mark Washenberger wrote:
> 
> 
> "Johannes Erdfelt" <johannes@xxxxxxxxxxx> said:
> 
>>
>> MySQL isn't exactly slow and Nova doesn't have particularly large
>> tables. It looks like the slowness is coming from the network and how
>> many queries are being made.
>>
>> Avoiding joins would mean even more queries, which looks like it would
>> slow it down even further.
>>
> 
> This is exactly what I saw in my profiling. More complex queries did
> still seem to take longer than less complex ones, but it was a second
> order effect compared to the overall volume of queries. 
> 
> I'm not sure that network was the culprit though, since my ping
> roundtrip time was small relative to the wall time I measured for each
> nova.db.api call.
> 
> 
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