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 <vincent.blondeau@worldline.com> 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:pharo-dev-bounces@lists.pharo.org] 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
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