postgres

Commit Graph

Author	SHA1	Message	Date
Tom Lane	391eb5e5b6	Reimplement free-space-map management as per recent discussions. Adjustable threshold is gone in favor of keeping track of total requested page storage and doling out proportional fractions to each relation (with a minimum amount per relation, and some quantization of the results to avoid thrashing with small changes in page counts). Provide special- case code for indexes so as not to waste space storing useless page free space counts. Restructure internal data storage to be a flat array instead of list-of-chunks; this may cost a little more work in data copying when reorganizing, but allows binary search to be used during lookup_fsm_page_entry().	23 years ago
Tom Lane	88dc31e3f2	First cut at recycling space in btree indexes. Still some rough edges to fix, but it seems to basically work...	23 years ago
Tom Lane	b2735fcd52	Performance improvement for MultiRecordFreeSpace on large relations --- avoid O(N^2) behavior. Problem noted and fixed by Stephen Marshall <smarshall@wsicorp.com>, with some help from Tom Lane.	23 years ago
Bruce Momjian	e50f52a074	pgindent run.	23 years ago
Bruce Momjian	d84fe82230	Update copyright to 2002.	24 years ago
Tom Lane	386f1809a7	Fix logic error in insert_fsm_page_entry: because compact_fsm_page_list removes any empty chunks, the chunk previously added won't be there anymore, so it's possible there is zero free space in the rel's page list afterwards. Must loop back and rerun the part that adds a chunk to the list.	24 years ago
Bruce Momjian	ea08e6cd55	New pgindent run with fixes suggested by Tom. Patch manually reviewed, initdb/regression tests pass.	24 years ago
Bruce Momjian	6783b2372e	Another pgindent run. Fixes enum indenting, and improves #endif spacing. Also adds space for one-line comments.	24 years ago
Bruce Momjian	b81844b173	pgindent run on all C files. Java run to follow. initdb/regression tests pass.	24 years ago
Tom Lane	8a52b893b3	Further cleanup of dynahash.c API, in pursuit of portability and readability. Bizarre '(long *) TRUE' return convention is gone, in favor of just raising an error internally in dynahash.c when we detect hashtable corruption. HashTableWalk is gone, in favor of using hash_seq_search directly, since it had no hope of working with non-LONGALIGNable datatypes. Simplify some other code that was made undesirably grotty by promixity to HashTableWalk.	24 years ago
Tom Lane	5999e78fc4	Another round of cleanups for dynahash.c (maybe it's finally clean of portability issues). Caller-visible data structures are now allocated on MAXALIGN boundaries, allowing safe use of datatypes wider than 'long'. Rejigger hash_create API so that caller specifies size of key and total size of entry, not size of key and size of rest of entry. This simplifies life considerably since each number is just a sizeof(), and padding issues etc. are taken care of automatically.	24 years ago
Tom Lane	499abb0c0f	Implement new 'lightweight lock manager' that's intermediate between existing lock manager and spinlocks: it understands exclusive vs shared lock but has few other fancy features. Replace most uses of spinlocks with lightweight locks. All remaining uses of spinlocks have very short lock hold times (a few dozen instructions), so tweak spinlock backoff code to work efficiently given this assumption. All per my proposal on pghackers 26-Sep-01.	24 years ago
Tom Lane	8a59f336bb	Minor performance improvement in MultiRecordFreeSpace.	25 years ago
Tom Lane	42748087c1	First non-stub implementation of shared free space map. It's not super useful as yet, since its primary source of information is (full) VACUUM, which makes a concerted effort to get rid of free space before telling the map about it ... next stop is concurrent VACUUM ...	25 years ago
Tom Lane	af5ced9cfd	Further work on connecting the free space map (which is still just a stub) into the rest of the system. Adopt a cleaner approach to preventing deadlock in concurrent heap_updates: allow RelationGetBufferForTuple to select any page of the rel, and put the onus on it to lock both buffers in a consistent order. Remove no-longer-needed isExtend hack from API of ReleaseAndReadBuffer.	25 years ago
Tom Lane	e0c9301c87	Install infrastructure for shared-memory free space map. Doesn't actually do anything yet, but it has the necessary connections to initialization and so forth. Make some gestures towards allowing number of blocks in a relation to be BlockNumber, ie, unsigned int, rather than signed int. (I doubt I got all the places that are sloppy about it, yet.) On the way, replace the hardwired NLOCKS_PER_XACT fudge factor with a GUC variable.	25 years ago

16 Commits (21591967bc19c749a100fb97ec82f6086ce5cc3c)