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Break PERFORMANCE up into subsections.

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Bruce Momjian 2002-01-22 20:50:35 +00:00
parent fdf881d155
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1 changed files with 36 additions and 23 deletions
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@ -1,6 +1,6 @@
TODO list for PostgreSQL
========================
Last updated: Tue Jan 22 15:39:51 EST 2002
Last updated: Tue Jan 22 15:49:54 EST 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@ -372,44 +372,57 @@ VACUUM
* -Allow ANALYZE to ESTIMATE based on certain random precentage of rows (Tom)
* Add LAZY VACUUM (Vadim) [performance]
MISCELLANEOUS
LOCKING
* Make locking of shared data structures more fine-grained
* Add code to detect an SMP machine and handle spinlocks accordingly
* Research use of sched_yield() for spinlock acquisition failure
* -Improve spinlock code [performance] (Tom)
STARTUP TIME
* -Allow compression of log and meta data (Tom)
* Do async I/O for faster random read-ahead of data
* Experiment with multi-threaded backend [thread]
* Get faster regex() code from Henry Spencer <henry@zoo.utoronto.ca>
when it is available
* Use mmap() rather than SYSV shared memory(?) [mmap]
* Use mmap() to write WAL files (?) [mmap]
* Improve Subplan list handling
* Allow Subplans to use efficient joins(hash, merge) with upper variable
* Improve dynamic memory allocation by introducing tuple-context memory
allocation (Tom)
* -Allow GUC configuration of maximum number of open files (Tom)
* -Improve statistics storage in pg_class [performance] (Tom)
* Add connection pooling [pool]
* Allow persistent backends [persistent]
* Create a transaction processor to aid in persistent connections and
connection pooling
* Allow logging of query durations
* Add hash for evaluating GROUP BY aggregates
* -Read pg_hba.conf only on postmaster startup or SIGHUP (Bruce)
* Do listen() in postmaster and accept() in pre-forked backend
* Have pre-forked backend pre-connect to last requested database or pass
file descriptor to backend pre-forked for matching database
WRITE-AHEAD LOG
* Have after-change WAL write()'s write only modified data to kernel
* Reduce number of after-change WAL writes; they exist only to gaurd against
partial page writes
* Turn off after-change writes if fsync is disabled (?)
* -Improve spinlock code [performance] (Tom)
* Do listen() in postmaster and accept() in pre-forked backend
* Have pre-forked backend pre-connect to last requested database or pass
file descriptor to backend pre-forked for matching database
OPTIMIZER/EXECUTOR
* Improve Subplan list handling
* Allow Subplans to use efficient joins(hash, merge) with upper variable
* Improve dynamic memory allocation by introducing tuple-context memory
allocation (Tom)
* Add hash for evaluating GROUP BY aggregates
* Nested FULL OUTER JOINs don't work (Tom)
* Allow merge and hash joins on expressions not just simple variables (Tom)
* Add new pg_proc cachable settings to specify whether function can be
evaluated only once or once per query
* Change FIXED_CHAR_SEL to 0.20 from 0.04 to give better selectivity (Bruce)
* Make locking of shared data structures more fine-grained
* Make IN/NOT IN have similar performance to EXISTS/NOT EXISTS [exists]
* Add code to detect an SMP machine and handle spinlocks accordingly
MISCELLANEOUS
* -Allow compression of log and meta data (Tom)
* Do async I/O for faster random read-ahead of data
* Get faster regex() code from Henry Spencer <henry@zoo.utoronto.ca>
when it is available
* Use mmap() rather than SYSV shared memory or to write WAL files (?) [mmap]
* -Allow GUC configuration of maximum number of open files (Tom)
* -Improve statistics storage in pg_class [performance] (Tom)
* Allow logging of query durations
* -Read pg_hba.conf only on postmaster startup or SIGHUP (Bruce)
SOURCE CODE
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