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pageserver: reduce default compaction_upper_limit to 20 #10889

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Feb 19, 2025
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pageserver: reduce default compaction_upper_limit to 20 #10889

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9 changes: 5 additions & 4 deletions libs/pageserver_api/src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -544,10 +544,11 @@ pub mod tenant_conf_defaults {
pub const DEFAULT_COMPACTION_PERIOD: &str = "20 s";
pub const DEFAULT_COMPACTION_THRESHOLD: usize = 10;

// This value needs to be tuned to avoid OOM. We have 3/4 of the total CPU threads to do background works, that's 16*3/4=9 on
// most of our pageservers. Compaction ~50 layers requires about 2GB memory (could be reduced later by optimizing L0 hole
// calculation to avoid loading all keys into the memory). So with this config, we can get a maximum peak compaction usage of 18GB.
pub const DEFAULT_COMPACTION_UPPER_LIMIT: usize = 50;
// This value needs to be tuned to avoid OOM. We have 3/4*CPUs threads for L0 compaction, that's
// 3/4*16=9 on most of our pageservers. Compacting 20 layers requires about 1 GB memory (could
// be reduced later by optimizing L0 hole calculation to avoid loading all keys into memory). So
// with this config, we can get a maximum peak compaction usage of 9 GB.
pub const DEFAULT_COMPACTION_UPPER_LIMIT: usize = 20;
pub const DEFAULT_COMPACTION_L0_FIRST: bool = false;
pub const DEFAULT_COMPACTION_L0_SEMAPHORE: bool = true;

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