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Add option to specify segment size in blocks

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The tests don't have much coverage of segment related code, as we don't create
large enough tables. To make it easier to test these paths, add a new option
specifying the segment size in blocks.

Set the new option to 6 blocks in one of the CI tasks. Smaller numbers
currently fail one of the tests, for understandable reasons.

While at it, fix some segment size related issues in the meson build.

Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20221107171355.c23fzwanfzq2pmgt@awork3.anarazel.de
This commit is contained in:
Andres Freund
2022-12-07 19:32:59 -08:00
parent bf07ab492c
commit d3b111e320
6 changed files with 132 additions and 24 deletions
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24
meson.build
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@ -419,7 +419,19 @@ meson_bin = find_program(meson_binpath, native: true)
cdata.set('USE_ASSERT_CHECKING', get_option('cassert') ? 1 : false)
cdata.set('BLCKSZ', get_option('blocksize').to_int() * 1024, description:
blocksize = get_option('blocksize').to_int() * 1024
if get_option('segsize_blocks') != 0
if get_option('segsize') != 1
warning('both segsize and segsize_blocks specified, segsize_blocks wins')
endif
segsize = get_option('segsize_blocks')
else
segsize = (get_option('segsize') * 1024 * 1024 * 1024) / blocksize
endif
cdata.set('BLCKSZ', blocksize, description:
'''Size of a disk block --- this also limits the size of a tuple. You can set
it bigger if you need bigger tuples (although TOAST should reduce the need
to have large tuples, since fields can be spread across multiple tuples).
@ -429,7 +441,7 @@ cdata.set('BLCKSZ', get_option('blocksize').to_int() * 1024, description:
Changing BLCKSZ requires an initdb.''')
cdata.set('XLOG_BLCKSZ', get_option('wal_blocksize').to_int() * 1024)
cdata.set('RELSEG_SIZE', get_option('segsize') * 131072)
cdata.set('RELSEG_SIZE', segsize)
cdata.set('DEF_PGPORT', get_option('pgport'))
cdata.set_quoted('DEF_PGPORT_STR', get_option('pgport').to_string())
cdata.set_quoted('PG_KRB_SRVNAM', get_option('krb_srvnam'))
@ -3132,9 +3144,11 @@ if meson.version().version_compare('>=0.57')
summary(
{
'data block size': cdata.get('BLCKSZ'),
'WAL block size': cdata.get('XLOG_BLCKSZ') / 1024,
'segment size': cdata.get('RELSEG_SIZE') / 131072,
'data block size': '@0@ kB'.format(cdata.get('BLCKSZ') / 1024),
'WAL block size': '@0@ kB'.format(cdata.get('XLOG_BLCKSZ') / 1024),
'segment size': get_option('segsize_blocks') != 0 ?
'@0@ blocks'.format(cdata.get('RELSEG_SIZE')) :
'@0@ GB'.format(get_option('segsize')),
},
section: 'Data layout',
)