Envoy: [Question] Envoy binary size increase

[appario]

We had forked envoy around the v1.11 release and at that time the stripped binary size was around 27M. I recently merged the v1.14 release and noticed that the binary size had doubled to 55M for the same build config. Are there any high level new filter/features that were added in the last couple of releases that would cause such a jump?

@sumukhs

[mattklein123]

Nothing specific comes to mind, but that's a huge increase. Not sure what filters, etc. you are bringing in. I would definitely only compile the filters you are actually using. @junr03 has done size analysis for Envoy Mobile and can possibly provide some scripts if you are looking to better understand where size is being spent.

[appario]

That would be very helpful. Thanks!

[moderation]

I know from testing that the Kafka filter alone adds about 11MB. This is another reason why I advocate for custom builds where only the extensions you need are compiled into the binary (vs. the kitchen sink images / approach).

[junr03]

@appario I would make sure you are only compiling what you need per @mattklein123 and @moderation's suggestion. Is that the case for your data point? Additionally one salient point is that since v1.11 the v3 APIs were introduced. That by no means account for such a big increase, but it does account for a non-trivial amount (for example, it accounts for ~10% of Envoy Mobile's size under some measures).

You could follow the instructions here to do some analysis on your Envoy binary. I have used a tool called Bloaty, per the instructions. Bloaty even allows you to compare binaries and see where the increases happened.

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