FreeSpaceMapRewrite
From PostgreSQL wiki
Performance testing
Raw speed
To measure the raw speed of just the FSM, I'm using a C user-defined function that just stresses the FSM by doing random FSM requests.
The results are quite interesting:
| 0.3MB | 3.3MB | 33MB | 326MB | 3255MB | ||
|---|---|---|---|---|---|---|
| CVS HEAD | 2652 | 1763 | 1078 | 413 | 77 | 7.9 |
| patched | 133 | 356 | 421 | 420 | 339 | 468 |
Here's the script used for this test fsmtest-20080822.tgz
