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Use pg_pread() and pg_pwrite() for data files and WAL.

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Cut down on system calls by doing random I/O using offset-based OS
routines where available.  Remove the code for tracking the 'virtual'
seek position.  The only reason left to call FileSeek() was to get
the file's size, so provide a new function FileSize() instead.

Author: Oskari Saarenmaa, Thomas Munro
Reviewed-by: Thomas Munro, Jesper Pedersen, Tom Lane, Alvaro Herrera
Discussion: https://postgr.es/m/CAEepm=02rapCpPR3ZGF2vW=SBHSdFYO_bz_f-wwWJonmA3APgw@mail.gmail.com
Discussion: https://postgr.es/m/b8748d39-0b19-0514-a1b9-4e5a28e6a208%40gmail.com
Discussion: https://postgr.es/m/a86bd200-ebbe-d829-e3ca-0c4474b2fcb7%40ohmu.fi
This commit is contained in:
Thomas Munro
2018-11-07 09:51:50 +13:00
parent 3fd2a7932e
commit c24dcd0cfd
6 changed files with 42 additions and 288 deletions
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2
src/backend/access/heap/rewriteheap.c
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@ -935,7 +935,7 @@ logical_heap_rewrite_flush_mappings(RewriteState state)
* Note that we deviate from the usual WAL coding practices here,
* check the above "Logical rewrite support" comment for reasoning.
*/
written = FileWrite(src->vfd, waldata_start, len,
written = FileWrite(src->vfd, waldata_start, len, src->off,
WAIT_EVENT_LOGICAL_REWRITE_WRITE);
if (written != len)
ereport(ERROR,