Matthias- This does both and tries to work with the data type to make the output more performant to access. The "(header)" parts are the bookkeeping information the Java virtual machine uses to support memory management and store the object’s type. Bertnard- Add more details to wait events, for example when buffer content could have relfilenode and other information included. It is cheaper to reuse information that is already in local memory than to transfer the information back from the operating system disk cache or to read it off of the disk drive again. I figured going back to ancient times won’t help here. It recompiles GCC’s GIMPLE intermediate language to Graphite & back to better optimize memory references in loops, if there is more than one loop & (as this optimization would’ve already been applied) in absence of OpenMP/etc. To do so, with loop optimizers, copy tables, & dominance info initialized, it iterates over every loop from innermost to outermost skipping ones we’d prefer to keep concise rather than fast. Wait events added because they're cheap but adding this other info adds a lot of additional overhead in certain code paths.

Andres- Suspect overhead is going to be too high and will need a completely different mechanism because collecting all that data for all wait events and most of the time it's not going to be needed and is just expensive. Bertnard- Most of the time you have to guess when you have a waitevent but you don't know what is happening. Hosting Tournaments: If you have aspirations of hosting friendly tournaments, a larger table might be beneficial. Autoclosing received file descriptors for zombie objects, for which a special replacement object might be allocated on upon object de-allocation. Might not go into 16 but the code works. Also have prototype code which allows doing something similar for libc. Bertnard- During 10s you have a bunch of different wait events if some aren't valid maybe is ok but you need to know that it's valid. If database is waiting on something but you don't know what it's waiting on then that's not as helpful. Then it’ll attempt a more thorough/complex positioning of function prologues & epilogues. After a few more checks it restructures the codeblocks/stores to actually remove the branch, & adjusts the referenced instructions to read the right data.

Jeff- If we feel ICU is the right thing, we've been using it for a while and we have found some issues with it and it isn't perfect but generally my feeling is that it's a better path than libc and if the project feels that way then we should start nudging people in that direction. Ring buffer idea, would have to be very small ring buffer to avoid too much overhead and have to poll very very often and that all ends up with a lot of overhead. Andres- Data-dependent branches added to this to collect numbers the overhead is going to be way higher. It recursively iterates over control flow labels to collect their offsets. It then iterates over all the basic blocks examining their last instruction to collect their outgoing control flow graph edges & any invariants within each codeblock. If there are user-facing issues then that's a bug that should be addressed. But, there are potential advantages to using ICU because it's a separated library that you could manage the versioning of instead of being tied to libc. Peter E- When on new platform sometimes it's nice to be able to git clone and build and avoid ICU because ICU is big to download and build.

Peter E- Then just say to use that? Simplest proposal at initdb time could be to pass a flag saying which is needed and then have that track and do initialization and setting up the collation from that provider. Storage of the performance data storage is going to have to be something completely separate from wait event. Joe- There was a regression introduced by the C maintainers where they made a change saying it wouldn't cause a performance issue but it actually does for multi-byte. Tomas- Is there a way to track the version and on server start check the version and refuse to start if needed. Could be extended to build a different version if needed. No extra dependencies on MacOS currently to build and some appreciate that. SHARE ROW EXCLUSIVE Conflicts with the ROW EXCLUSIVE, SHARE UPDATE EXCLUSIVE, SHARE, SHARE ROW EXCLUSIVE, EXCLUSIVE, and ACCESS EXCLUSIVE lock modes. Accessibility: Ensure there’s enough space to walk around and access the table from all angles.

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