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branches/innodb+: Add posix_fadvise() caching hints to the temporary files

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that are used in merge sort when creating indexes.
This commit is contained in:
marko 2008-03-03 10:27:57 +00:00
parent 5cf58ce919
commit db0d73fe6f
1 changed files with 25 additions and 4 deletions
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29
row/row0merge.c
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@ -40,6 +40,11 @@ Completed by Sunny Bains and Marko Makela
#include "ut0sort.h"
#include "handler0alter.h"
/* Ignore posix_fadvise() on those platforms where it does not exist */
#if defined __WIN__
# define posix_fadvise(fd, offset, len, advice) /* nothing */
#endif /* __WIN__ */
#ifdef UNIV_DEBUG
/* Set these in order ot enable debug printout. */
static ibool row_merge_print_cmp;
@ -641,6 +646,9 @@ row_merge_read(
(ulint) (ofs & 0xFFFFFFFF),
(ulint) (ofs >> 32),
sizeof *buf);
/* Each block is read exactly once. Free up the file cache. */
posix_fadvise(fd, ofs, sizeof *buf, POSIX_FADV_DONTNEED);
if (UNIV_UNLIKELY(!success)) {
ut_print_timestamp(stderr);
fprintf(stderr,
@ -664,11 +672,18 @@ row_merge_write(
{
ib_uint64_t ofs = ((ib_uint64_t) offset)
* sizeof(row_merge_block_t);
ibool success;
return(UNIV_LIKELY(os_file_write("(merge)", OS_FILE_FROM_FD(fd), buf,
(ulint) (ofs & 0xFFFFFFFF),
(ulint) (ofs >> 32),
sizeof(row_merge_block_t))));
success = os_file_write("(merge)", OS_FILE_FROM_FD(fd), buf,
(ulint) (ofs & 0xFFFFFFFF),
(ulint) (ofs >> 32),
sizeof(row_merge_block_t));
/* The block will be needed on the next merge pass,
but it can be evicted from the file cache meanwhile. */
posix_fadvise(fd, ofs, sizeof *buf, POSIX_FADV_DONTNEED);
return(UNIV_LIKELY(success));
}
/************************************************************************
@ -1416,6 +1431,12 @@ row_merge(
of.fd = *tmpfd;
of.offset = 0;
/* The input file will be read sequentially, starting from the
beginning and the middle. In Linux, the POSIX_FADV_SEQUENTIAL
affects the entire file. Each block will be read exactly once. */
posix_fadvise(file->fd, 0, 0,
POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE);
/* Merge blocks to the output file. */
foffs0 = 0;
foffs1 = half;