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Merge pull request #23322 from azat/disable-min_bytes_to_use_mmap_io

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Disable min_bytes_to_use_mmap_io by default
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alexey-milovidov 2021-04-20 19:27:47 +03:00 committed by GitHub
commit a311a5c0b5
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2 changed files with 4 additions and 1 deletions
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3
docker/test/performance-comparison/config/users.d/perf-comparison-tweaks-users.xml
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@ -17,6 +17,9 @@
<!-- One NUMA node w/o hyperthreading -->
<max_threads>12</max_threads>
<!-- mmap shows some improvements in perf tests -->
<min_bytes_to_use_mmap_io>64Mi</min_bytes_to_use_mmap_io>
</default>
</profiles>
<users>

2
src/Core/Settings.h
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@ -143,7 +143,7 @@ class IColumn;
M(UInt64, optimize_min_equality_disjunction_chain_length, 3, "The minimum length of the expression `expr = x1 OR ... expr = xN` for optimization ", 0) \
\
M(UInt64, min_bytes_to_use_direct_io, 0, "The minimum number of bytes for reading the data with O_DIRECT option during SELECT queries execution. 0 - disabled.", 0) \
M(UInt64, min_bytes_to_use_mmap_io, (64 * 1024 * 1024), "The minimum number of bytes for reading the data with mmap option during SELECT queries execution. 0 - disabled.", 0) \
M(UInt64, min_bytes_to_use_mmap_io, 0, "The minimum number of bytes for reading the data with mmap option during SELECT queries execution. 0 - disabled.", 0) \
M(Bool, checksum_on_read, true, "Validate checksums on reading. It is enabled by default and should be always enabled in production. Please do not expect any benefits in disabling this setting. It may only be used for experiments and benchmarks. The setting only applicable for tables of MergeTree family. Checksums are always validated for other table engines and when receiving data over network.", 0) \
\
M(Bool, force_index_by_date, 0, "Throw an exception if there is a partition key in a table, and it is not used.", 0) \