Amazing work and great news! Thanks a lot.
Doru -- www.tudorgirba.com "Every thing has its own flow" > On 3 Mar 2017, at 13:31, Blondeau Vincent <[email protected]> > wrote: > > Thanks Eliot for the implementation of the new compactor! > > Just to add a piece of information: the mse imported have a size of 40Mb. > > Cheers, > Vincent > > > De : Pharo-dev [mailto:[email protected]] De la part de > Clément Bera > Envoyé : vendredi 3 mars 2017 11:56 > À : Discusses Development of Pharo > Objet : [Pharo-dev] Growing large images: the case of Moose models > > Hello everyone, > > This morning I investigated with Vincent Blondeau a problem reported by the > Moose community a while ago: loading Moose model is slower in Spur (Pharo 5+) > than in pre-Spur (Pharo 4 and older). In general, this problem was present > for anyone growing images to a significant size. > > To investigate the problem, we loaded a 200Mb[3] Moose model on a 250Mb > image, growing the image to 450Mb. Loading such a model takes 2 minutes in > Spur and 1m30s in pre-Spur VMs. > > Using the stable Pharo VM, the analysis results were the following: > - total time spent to load the Model: 2 minutes > - time spent in full GC: 1 minute (4 fullGCs) > - time spent in scavenges[1]: 15 seconds > On the 2 minutes spent, we have 50% of the time spent in full GCs, 12.5% in > scavenges, 37.5% executing code. > > We then used the latest VM that features the new compactor (VM from beginning > of March 2017 and over). The full GC execution time went down from 1 minute > to 2 seconds. > > In addition, we increased the size of Eden[2] from 4Mb to 12Mb. Time spent in > scavenges decreased from 15 seconds to 5 seconds. > > Overall, loading the model is now taking ~50 seconds instead of 2 minutes. > > To increase Eden size, one needs to run a script similar to: > > | currentEdenSize desiredEdenSize | > currentEdenSize := Smalltalk vm parameterAt: 44. > desiredEdenSize := currentEdenSize * 4. > Smalltalk vm parameterAt: 45 put: desiredEdenSize. > > And then restart the image. > > I hope this report can be useful for some of you. I will try to make a blog > post out of it, detailing other GC settings one can change from the image to > improve performance. > > Best, > > Clement > > [1] A scavenge is basically the garbage collection of only young objects > [2] Eden is basically the space where objects are initially allocated. > [3] All numbers in the report are order of magnitudes and not precise numbers > > > > > !!!************************************************************************************* > "Ce message et les pièces jointes sont confidentiels et réservés à l'usage > exclusif de ses destinataires. Il peut également être protégé par le secret > professionnel. Si vous recevez ce message par erreur, merci d'en avertir > immédiatement l'expéditeur et de le détruire. L'intégrité du message ne > pouvant être assurée sur Internet, la responsabilité de Worldline ne pourra > être recherchée quant au contenu de ce message. Bien que les meilleurs > efforts soient faits pour maintenir cette transmission exempte de tout virus, > l'expéditeur ne donne aucune garantie à cet égard et sa responsabilité ne > saurait être recherchée pour tout dommage résultant d'un virus transmis. > > This e-mail and the documents attached are confidential and intended solely > for the addressee; it may also be privileged. If you receive this e-mail in > error, please notify the sender immediately and destroy it. As its integrity > cannot be secured on the Internet, the Worldline liability cannot be > triggered for the message content. Although the sender endeavours to maintain > a computer virus-free network, the sender does not warrant that this > transmission is virus-free and will not be liable for any damages resulting > from any virus transmitted.!!!" > _______________________________________________ > Moose-dev mailing list > [email protected] > https://www.list.inf.unibe.ch/listinfo/moose-dev
