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archiver: Reduce tree saver concurrency

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Large amount of tree savers have no obvious benefit, however they can
increase the amount of (potentially large) trees kept in memory.
This commit is contained in:
Michael Eischer 2021-08-07 23:33:43 +02:00
parent bba1e81719
commit fa25d6118e
1 changed files with 6 additions and 3 deletions
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9
internal/archiver/archiver.go
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@ -128,9 +128,12 @@ func (o Options) ApplyDefaults() Options {
}
if o.SaveTreeConcurrency == 0 {
// use a relatively high concurrency here, having multiple SaveTree
// workers is cheap
o.SaveTreeConcurrency = o.SaveBlobConcurrency * 20
// can either wait for a file, wait for a tree, serialize a tree or wait for saveblob
// the last two are cpu-bound and thus mutually exclusive.
// Also allow waiting for FileReadConcurrency files, this is the maximum of FutureFiles
// which currently can be in progress. The main backup loop blocks when trying to queue
// more files to read.
o.SaveTreeConcurrency = uint(runtime.GOMAXPROCS(0)) + o.FileReadConcurrency
}
return o