2009/3/11 Joost 't Hart <[email protected]>
> Pascal Georges wrote:
>
>> Did you tell us how much RAM do you have (total / free) ?
>> File cache is really important with Scid (and other intensive apps).
>>
>
> Thanks Pascal. No, I did not, although Alexander hinted towards it.
>
> I have 1 GB of RAM, and indeed this is probably not sufficient to run the
> compaction on a dbase of this size.
>
Also for Tree operations, 2 GB leads to far better performances than 1 GB. I
experienced some operations going down from several hours to 20 minutes or
so.
>
> Upon opening this base, scid eats already about 350 MB. Which is a lot, but
> not a problem per se.
>
> What I realized only later, is that gamefile compaction after a serious
> re-sort comes with a serious amount of seek operations in the old game file.
> The OS wants to try to accomodate this - indeed by caching. However, caching
> of a 400 MB file on my system, apart from scid taking its bite, is not
> trivial.
>
> I saw immediate improvements after closing any other application. With a
> cheap desktop like wmaker there was even more improvement. Nevertheless, in
> the end, the performance remains disappointing.
>
> One final question from this end: Is eating the 350 MB really required?
> Could´nt we release a lot of this while compacting? Or is there no way to do
> this currently... I see that this memory is not even released after I do
> completely close the data base.
>
Why are you sure the memory was not released ? I don't want to go into
discussions about memory management, but process sizes are often
meaningless.
Pascal
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