[webkit-dev] Reminder regarding formatting uint64_t

Michael Catanzaro mcatanzaro at igalia.com
Wed Feb 27 18:46:51 PST 2019

On Wed, Feb 27, 2019 at 6:05 PM, Keith Rollin <krollin at apple.com> wrote:
> The underlying Cocoa os_log facility

Yeah this is really interesting too. RELEASE_LOG is Cocoa-specific, 
because it's only backed by os_log. So when you change debug LOGs to 
RELEASE_LOG, you're removing the logging for other platforms. I wonder 
if we should change that.

> is able to greatly compress the logs stored in memory and on disk, as 
> well as get corresponding performance benefits, by taking advantage 
> of the fact that the formatting string is a literal that can be found 
> in the executable’s binary image. When you log with a particular 
> formatting string, that string is not included in the log archive, 
> but a reference to it is. In the case that Michael gives, a reference 
> to the big formatting string is stored along with the pointer, the 
> unsigned long long, and the integer. In the above example, a 
> reference to “%s” is stored, along with the fully-formatted 
> string. This latter approach takes up a lot more memory.



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