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Add comment to config

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This commit is contained in:
Alexey Milovidov 2021-02-07 06:00:31 +03:00
parent 280f459f71
commit 58f1d4d910
1 changed files with 5 additions and 0 deletions
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programs/server/config.xml
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@ -284,6 +284,11 @@
In bytes. Cache is single for server. Memory is allocated only on demand.
Cache is used when 'use_uncompressed_cache' user setting turned on (off by default).
Uncompressed cache is advantageous only for very short queries and in rare cases.
Note: uncompressed cache is pointless for lz4, because memory bandwidth is slower than multi-core decompression.
Enabling it will only make queries slower.
If number of CPU cores is in order of 100 and memory bandwidth is in range of 100-200 GB/sec,
there is a chance it is also being pointless for zstd.
-->
<uncompressed_cache_size>8589934592</uncompressed_cache_size>