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In my antecedent article, we covered how we begin and apparent a anchored amount of application PutObject on the AWS S3 .NET client; it was additionally mentioned that we transform the angel afore it is uploaded to AWS S3 – this is a action that is accomplished at atomic 500,000 times a day. With that in apperception I absitively it was account exploring the absolute cipher path. As consistently you can acquisition all the cipher talked about here, and we will be application this angel in our testing. Let us booty a attending at the absolute implementation. Afore we can transform an angel we charge to get a authority of it:-

Do you see that .ToArray()? It is evil. I do not accept the statistics to duke but I apperceive for a actuality I accept apparent images beyond than four megabytes appear through this cipher path. That does not augur able-bodied – a quick aiguille at the accomplishing shows us why:-

The LOH beginning is 85,000 bytes this would beggarly any images beyond than the beginning would go beeline assimilate the LOH – this is a problem, I covered why it is a botheration in my antecedent article. At this point concern got the bigger of me — I absolutely capital to apperceive the admeasurement of images advancing into this service.

This account processes hundreds of bags images per day, all I charge is a quick sample; an abstraction of the admeasurement and appearance of admission data. We accept a job that runs at 14:00 every day to cull the latest images from one of our customers.

Hitting their account manually allotment 14,630 images to be processed. Spinning up a quick animate app to accomplish a HEADrequest and get the Content-Length header:-

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Yikes, that is a huge accepted aberration and 97.58% of the images are aloft the LOH beginning (85,000 bytes). Now that we apperceive the advance of angel sizes, we can resume attractive at the blow of the absolute implementation:-

I accept suspicions about the two MemoryStream’s animadversion about but dotTrace can affirm or abjure my suspicions. Running V1 with the sample angel one hundred times:-

Using dotTrace we can see area the bigger costs are:-

Now that we accept accustomed a baseline — lets get cracking!

If we inline the GetImageFromUrl and aish the CanCreateImageFrom – which is not bare because we analysis the Content-Type beforehand in the cipher aisle (not shown), we can anon accomplish on the admission stream.

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Stats for V2:-

Awesome, a few accessory tweaks and all the metrics accept alone beyond the board.

Using dotTrace again, we can see the aing bigger cost:-

Something is accident central of the architect of GPStream that is costing us dearly. Luckily dotTrace can appearance us the decompiled antecedent which saves us a cruise to Reference Sources:-

You apperceive back you ask yourself a catechism out loud and you can acknowledgment it beeline away?

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No, you can’t. Makes absolute faculty back you anticipate about it and because the admission Beck is not seekable GPStream has to booty a archetype of it.

Okay, aboriginal thing — can we move the amount from framework cipher to our code? It is not appealing but commodity like this works:-

dotTrace shows us that we accept absolutely confused the amount from framework cipher into our code:-

Now we could use our old acquaintance System.Buffers and aloof hire a byte[] arrangement again canyon that to the architect of the MemoryStream. That would work, except two things. Firstly, Content-Length is not affirmed to be set. Secondly, a few weeks beforehand I was dabbling about the .NET disciplinarian for Cassandra back I came beyond Microsoft.IO.RecyclableMemoryStreamand it acquainted like it was absolutely what I bare here. If you appetite to apprentice added about RecyclableMemoryStream Ben Watson has a abundant column on what it is and its assorted use cases. Jumping beeline into V3:-

One of my favourite things about RecyclableMemoryStream is that it is a drop-in backup for MemoryStream. The ArrayPool from System.Buffers requires you to Hire and again Return. Whereas RecyclableMemoryStream handles aggregate for you as it accouterments IDisposable. Anyway, abundant of my account for RecyclableMemoryStream; stats for V3:-

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That is an absurd advance from V1. This is what V3 looks like in dotTrace:-

My ability on System.Drawing is appealing coarse but an afternoon account about it leads me to the cessation that if you can abstain application System.Drawing again you are bigger off. Whilst analytic for an another to System.Drawing, I came beyond this commodity accounting by Omar Shahine. Huh, I never advised the overloads. Takes two abnormal to try this so we ability as well; v3 with useEmbeddedColorManagement disabled and validateImageData angry off these are the stats:-

A accessory access in some areas but a apparent bead in Aiguille Alive Set – great! A hardly added contempo commodity by Bertrand Le Roy goes through the assorted alternatives to System.Drawing. Thankfully, there is a nice little blueprint at the basal that shows achievement in the ambience of time taken.

According to that commodity PhotoSauce.MagicScaler is appealing magic — word of admonishing this library is Windows only. I admiration how abracadabra it absolutely is? Spinning V4 up:-

And the stats:-

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An batty bead in time taken and a advantageous bead in Aiguille Alive Set!

That is magic.

Pun not intended — just afore this commodity was about to be appear I saw this absorbing tweet:-

Naturally I was interested, spinning up V5 gave me agnate after-effects to V4 except a apparent access in time taken, aiguille alive set, and LOH allocations. After a chat on their Gitter I learnt that they are:-

If your angel transformation action is mostly resizing and you are hosted on Windows again attending into application PhotoSauce.MagicScaler with Microsoft.IO.RecyclableMemoryStream you will see a cogent abridgement in assorted achievement accompanying metrics. In our case sixty to ninety allotment reductions.

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