IRC log of #zope3-dev for Friday, 2008-12-05

« Thursday, 2008-12-04 Index Saturday, 2008-12-06 »
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Theuni1J1m: If I understand your blob zeo cache patch correctly, the default check frequency option will cause the real cache boundary to be up to 200% of the cache size boundary18:38
J1mYes.18:38
J1mThat math probably wants to be reworked.18:38
J1mIt also gets more complex with multiple clients sharing the same blob directory.18:39
Theuni1right18:39
Theuni1My concern for the default value would be to choose something where the results are obvious to the user.18:40
J1mWe'll often have 8 clients sharing a blob directory.18:40
J1mYeah, although they will also probably be wrong.18:40
J1malso note that the default is to put no limit on it.18:40
Theuni1Ah. That's an obvious default. :)18:40
J1mBut things could be rearranged a bit.  I'll probably revisit this when I have a bit more time.18:41
Theuni1So the math for one client is "worst case size = limit size * (1 + check_size/100)"18:41
J1mYes, I think so.18:42
Theuni1for multiple clients I'd assume worst case = limit_size * (1 + check_size*clients/100)18:42
J1mThere are lots of edge cases.18:42
Theuni1I think the worst case is relatively straight.18:42
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J1mIt might be better to set the check size to something much smaller, like 10 or 20 and then reduce the size to (1-check) * target18:43
J1mor 100- or whatever.18:44
J1mso if we check every 10% of the target, we'd reduce to 90% of the target.18:44
J1mso then the target would be the theoretical worst case.18:44
J1mI didn't put much effort into this detail in the first cut as there are harder issues to deal with.18:45
Theuni1sure.18:45
Theuni1i stumbled over this first as I'm reading the diff top down :)18:45
J1mOT, I'm going to refactor blob storage into a mix-in and the existing wrapper.18:47
J1mI'm then going to make FileStorage and MappingStorage support blobs directly.18:47
J1mThis will allow much better packing.18:48
Theuni1Sounds like you ran into issues with the proxy?18:48
Theuni1ah18:48
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Theuni1thought something like that18:48
J1mI think the proxy was a good start as it allowed us to work things out without disturbing too many other things.18:48
Theuni1yup18:49
J1mBut now, I'm inclined to make it easy for storages to support blobs directly, mainly, again, to do a better job with packing.18:49
J1mThe biggest challenge will be coming up with reusable tests.18:49
Theuni1Interesting. I would have expected them to be.18:50
Theuni1At least for zeoraid we've thrown them into the mix IIRC.18:50
J1mI don't now what "them" you are refering to.18:50
Theuni1the blob tests. but we didn't. right. they're in doctests.18:51
Theuni1I've gotta grab food and be social a bit. :)18:52
J1mdoctests can be made resuable.18:52
Theuni1i'm not arguing that18:52
J1msure, I'm hungry too.18:52
Theuni1they just aren't in the current state :)18:52
J1mYup18:52
Theuni1enjoy your food18:52
J1myou too18:52
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Theuni2J1m: i ran a simulation on your check ration and size suggestion and doing 10% check size and 100-check target for cache compaction i end up with a high mark of 104% and a low mark of 89% while checking about every 0.002% of all operations19:48
Theuni2s/ration/ratio/19:48
Theuni2Ah. Actually, the margin that we grow over the cache size equals roughly under the maximum object size in the database.19:50
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