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After optionally deleting debug instructions, it’ll "start the function" by generating labels for the hot & cold partitions of the function if any, disables assembler’s preprocessing, outputs any constants used in this function, computes alignment to hold/code partitions if any, … Now that we have growable arrays of values, we can add one to Chunk to store the chunk’s constants. Andres- store the buffer ID and then get the rest from shared buffers and doesn't introduce a lot of overhead by default. This benchmark needs some development, but already shows that we can saturate the buffer manager. Peter has done some benchmarking on the buffer manager. What Amit is doing to make the buffer manager more scalable. Amit wants to make the hash map for the buffer much more concurrent. A single lookup in the buffer mapping hash is 6000ns, it's way high. But that shifts contention to the mapping lock. Amit thinks there shouldn't be much contention at low numbers of buffers, but Haas contends that it's a matter of how many backends you have.

There are some issues with that. No changes have been made to the database file itself yet, though presumably there are changes being held in user memory. But if there was an approved workflow, this would make things a lot easier for reviewers. And a handful of other minor things. Noah pointed out that as commitfests get later, people push in things they really shouldn't. We want to constrain how we rebase things. Simon would like the ability to track buffers outside of the buffer pool so that we can know if we want to increase the size of the cache. Peter and Andres discussed buffer algorithms at some length. Peter mentioned CAR which is a successor to ARC. Jeff mentioned that pinning shared buffers also needed optimization. The alternative is to count accesses in one operation or how many buffers are accessed at the same time. Peter found that reference period was a much better idea than anything tied to the transaction, based on wall clock time instead of anything else. Greg's only workaround for checking clock time was to have a daemon which cyclically checks clock time in the background.

Maybe we could have a local recent pinned cache. How does data get into that cache? Then performs various checks to determine how to rearrange the data. That hashtable is reprocessed into bitmasks & arrays, temporarily adds fake exit edges to noreturn functions & infinite loops, computes an order to the control flow edges, then iterates over the collected stores inserting & deleting them where previously decided after discarding abnormal edges. Then we can try it out before we bless it. And since this is out from under the control of SQLite, there is nothing that SQLite can do to prevent it. There was a discussion about rebasing. There was more discussion about merge vs. There was a lot of back-and-forth and small fixes four per hour for logical replication. Andres uses this for his replication stuff. An attempt to avoid locally-committed-but-not-replicated-to-standby-transactions in synchronous replication -- Andres- Not sure why this needs to be solved..? Andres- There should be only a few places that need more than one. Heikki- Maybe linked list approach could be used for basically all of these cases instead since very few cases where there aren't structs. Most of the time, there is already extra capacity, so you don’t need to copy.

Smith asked about spinning up a copy of the app. What Peter wants are feature branches, which we could reference by commit hash in the CF app. Those live in a hash table owned by the VM, so we’ll declare another helper function for marking all of the objects in a table. For each arg it opens the given ELF file recursing into archives, opens an LibEBL backend, outputs a header, initializes various strings, retrieves the section-header string table index, & outputs it in a choice of format each involve an iteration over the ELF sections. There’s a more complex Joystick driver which applies to multiple device identifiers, includes some locking & state tracking, & it’s own character device file. In C there’s various edge cases which the standards explicitly do not specify. See if restructuring ifs (2 different cases) reveals more opportunities. Josh said that he prefers pulling from git repos to patches for testing.

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