[Yum-devel] Current yum git desolver is a little slow

[Tim Lauridsen]

Florian Festi wrote:
> Tim Lauridsen wrote:
>> I did some basic testing of the current yum git HEAD vs. yum 3.2.2.
>
> Yes, current git head is a bit slower than 3.2.2. There is a simple 
> reason for that: Linear searches on disk are even slower than linear 
> searches in memory.
>
> In other words: We are still missing some indexes in the sqlite 
> database to really gain speed from the changes. For performance runs 
> you can temporary remove patch 
> 3c2621ba8f8070f24ad3e979f6bd1699f6f6b394 or readd 
> 42283902f929ac131cda7b3497ae047b497e02bc.
>
> There are two possible permanent solutions:
>
> Readd the patch mentions above and extend it that all indexes are 
> created if they are not present yet. I posted timings for creating 
> these indexes some weeks ago (2. Aug "Sqlite DB Indexes").
>
> As alternative or in addition we could patch yum-metadata-parser to 
> just add the needed indexes.
>
> I can provide patches for both as soon as there is a decision with 
> way(s) we want to go.
>
>
I added this
http://devel.linux.duke.edu/gitweb/?p=yum.git;a=commitdiff;h=42283902f929ac131cda7b3497ae047b497e02bc
It speed up things a lot, but makes yum load the metadata every time, 
because the index creation changes the checksum i think.
I we want to create the indexes locally, how do we know when to download 
the sqlite tarball from the repo ?

Tim


Tim