[ZODB-Dev] Build compression into ZODB 3.11?

[Jürgen Herrmann]

Am 20.03.2012 15:27, schrieb Jim Fulton:
> On Thu, Mar 15, 2012 at 11:09 AM, Jim Fulton <jim at zope.com> wrote:
>> On Wed, Mar 14, 2012 at 1:47 PM, Jim Fulton <jim at zope.com> wrote:
> ...
>
>> At some point soonish, I'll do some
>> tests against a large database.
>
> On a database with 180 million records, 150 million of which
> are compressable:
>
>            Compressed        Compress      Uncompress
>            Size % of         time          time
>            uncompressed      microseconds  microseconds
> -------------------------------------------------------
> zlib        38                96           12.5
> lz4         52                7.4          1.6
> -------------------------------------------------------
>
> lz4 is an order of magnitude faster than zlib, however,
> lz4-compressed records were 36% larger.
>
> For me, I don't think the speedup is worth the loss of compression.
>
> Jim
>
Do you have an estimation on how much of the whole store cpu time
is used for compression?

best regards,
jürgen
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