Magma November 2006

magma@lists.squeakfoundation.org

7 participants
15 discussions

Magma question
by goran＠krampe.se 03 Nov '06

03 Nov '06

Hi Chris! Ok, so I am frantically getting Gjallar into some deployable shape here. :) Yesterday I played with creating 600 cases programmatically - kinda complex objects, one per commit - took 25 min which isn't all bad - and it was doing other silly things too. The more interesting fact is that Magma indexes seem to do their job perfectly fine with 600 cases in Gjallar. One of these nights I will push 10000 into it and we can see what happens. BUT... one silly question: If I use a reader with an index query - and the cases that the reader finds are already cached into the session - should it really be doing buffer reading? While doing one of these operations using the profiler I kept hitting "Q2Case allInstances size" in a workspace and it constantly showed 85 - just like before. So no new Q2Case objects were created but the profiler spent 10 seconds in Magma doing buffer reads it seems. I had expected it to just get some kind of oid, discover it already has the object in the imag - and that would be it. I can of course provide more info if you need it. regards, Göran

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Re: [solve] Re: Magma with 3.9 : Outage when creating repository
by Chris Muller 02 Nov '06

02 Nov '06

Hi Florent, there are two *projects* on SqueakSource. 1) MagmaTester 2) Magma MagmaTester is supposed to be the "beta" code being worked on. Magma is supposed to be the stable code. Each one has three projects: MagmaClientLoader (client only) MagmaServerLoader (all of client, plus server) MagmaTesterLoader (all of server (and, therefore, client), plus test code) This has caused plenty of confusion with many people in the past, its not you at all. So I would like to do something better so its not so confusing! Anyone have any ideas? ----- Original Message ---- From: florent trolat <trolat.florent(a)laposte.net> To: magma(a)lists.squeakfoundation.org Sent: Wednesday, November 1, 2006 4:45:01 AM Subject: [solve] Re: Magma with 3.9 : Outage when creating repository Maybe I'm not alone to be beginner and stupid ;-): the repository : www.squeaksource.com/MagmaTester the package: MagmaTesterLoader It was not obvious for me MagmaTesterLoader!!! ++ Florent florent trolat a écrit : > Thank you for your help.. > > I've spent many time... but I have always this Outage error! > > I've tried to load MagmaServerLoader from MagmaTester repository! > > Can you give me a goog package and repository for 3.9? > > > Chris Muller a écrit : >> Hi Florent, I'm with you! In working on Magma's next release, I >> believe I have found the cause of this problem. As I've mentioned, I >> think the cause of the problem was that 3.9 opens files in "text" mode >> insteaad of binary mode by default. Opening a file in binary mode, >> closing it, then reopening it, puts it back to text mode! >> >> So I have fixed this. Please load the latest version of >> MagmaServerLoader from the Magma project on SqueakSource and I do not >> think you will encounter this problem again. >> >> - Chris >> >> >> >> ----- Original Message ---- >> From: florent trolat <trolat.florent(a)laposte.net> >> To: magma(a)lists.squeakfoundation.org >> Sent: Monday, October 23, 2006 4:29:38 AM >> Subject: Magma with 3.9 : Outage when creating repository >> >> Hello, >> >> I've an Outage when I try : >> >> MagmaRepositoryController >> create: 'c:\myMagmaFolder' >> root: Dictionary new >> >> ,I've seen this probleme has been already discuss in the mailing list >> but I've not understood the solution! >> >> I have to load another version of magma? (at this moment my version is >> the server version from squeaksource repository) >> >> Thank you. >> >> Florent. >> _______________________________________________ >> Magma mailing list >> Magma(a)lists.squeakfoundation.org >> http://lists.squeakfoundation.org/mailman/listinfo/magma >> >> >> >> >> _______________________________________________ >> Magma mailing list >> Magma(a)lists.squeakfoundation.org >> http://lists.squeakfoundation.org/mailman/listinfo/magma > > _______________________________________________ > Magma mailing list > Magma(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/magma _______________________________________________ Magma mailing list Magma(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/magma

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Re: commit: [] cost
by Chris Muller 02 Nov '06

02 Nov '06

Great question. Generally, it is faster to make the commits "chunkier", i.e., put the commit on the outside: session commit: [ collection do: [:each | each doSomething]] but of course you have to be careful about committing *too much* at once. Magma imposes a (ridiculous) 10-meg limit, but you would never want to get close to that much in one commit, and with larger commits you have higher potential for concurrency with other users. but I assume this question is purely in context of single-user, raw performance. To help answer where to balance, it helps to know know how fast Magma can "oscillate" given a minimum commit (1 object change). As it happens, this is one of the very benchmarks of MagmaBenchmarker which you get for loading MagmaTesterLoader. You can run it or see http://minnow.cc.gatech.edu/squeak/5606 to see results from my computer: writeTests peakCommitRate : 20.3430394894296 per second. oneThousandElementArrayCommit : 15.4977150804689 per second. a1001BufferCommit : 5.99640215870478 per second. aOneMillionBufferCommit : 18 seconds.peakCommitRate goes through all of Magma's apparatus to change one single object. Since this is not especially quick, you want to do more than one object at a time, but you can see one million objects takes 18 second, probably too long. The benchmarker also measures "reads", so you can optimize your ReadStrategy's to bring down large chunks, but not too large. Regards, Chris So the answer depends heavily on what doSomething is. Generally, you want to do a "medium" amount of work in each commit. ----- Original Message ---- From: Hilaire Fernandes <hilaire2006(a)laposte.net> To: magma(a)lists.squeakfoundation.org Sent: Wednesday, November 1, 2006 12:33:42 AM Subject: commit: [] cost Is the cost the same in these two code snippets? session commit: [ collection do: [:each | each doSomething]] collection do: [:each | session commit: [each doSomething]] Hilaire _______________________________________________ Magma mailing list Magma(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/magma

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Re: Magma with 3.9 : Outage when creating repository
by Chris Muller 01 Nov '06

01 Nov '06

Hi Florent, I'm with you! In working on Magma's next release, I believe I have found the cause of this problem. As I've mentioned, I think the cause of the problem was that 3.9 opens files in "text" mode insteaad of binary mode by default. Opening a file in binary mode, closing it, then reopening it, puts it back to text mode! So I have fixed this. Please load the latest version of MagmaServerLoader from the Magma project on SqueakSource and I do not think you will encounter this problem again. - Chris ----- Original Message ---- From: florent trolat <trolat.florent(a)laposte.net> To: magma(a)lists.squeakfoundation.org Sent: Monday, October 23, 2006 4:29:38 AM Subject: Magma with 3.9 : Outage when creating repository Hello, I've an Outage when I try : MagmaRepositoryController create: 'c:\myMagmaFolder' root: Dictionary new ,I've seen this probleme has been already discuss in the mailing list but I've not understood the solution! I have to load another version of magma? (at this moment my version is the server version from squeaksource repository) Thank you. Florent. _______________________________________________ Magma mailing list Magma(a)lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/magma

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commit: [] cost
by Hilaire Fernandes 01 Nov '06

01 Nov '06

Is the cost the same in these two code snippets? session commit: [ collection do: [:each | each doSomething]] collection do: [:each | session commit: [each doSomething]] Hilaire

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Magma November 2006