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[io] Turn on async prefetching by default. #11256

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[io] Turn on async prefetching by default. #11256

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3 changes: 3 additions & 0 deletions README/ReleaseNotes/v630/index.md
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Expand Up @@ -50,6 +50,9 @@ The following people have contributed to this new version:

## I/O Libraries

Asyncronous prefetching is now enabled.
Turn if off by setting `TFile.AsyncPrefetching` to `0` in `rootrc`.


## TTree Libraries

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2 changes: 1 addition & 1 deletion config/rootrc.in
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Expand Up @@ -467,7 +467,7 @@ RSA.KeyType: 1
#TFile.AsyncReading: no

# Control the usage of asynchronous prefetching capabilities irrespective
# of the TFile implementation. By default it is disabled.
# of the TFile implementation. By default it is enabled.
#TFile.AsyncPrefetching: no

# Enable cross-protocol redirects
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2 changes: 1 addition & 1 deletion io/io/src/TFileCacheRead.cxx
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Expand Up @@ -136,7 +136,7 @@ TFileCacheRead::TFileCacheRead(TFile *file, Int_t buffersize, TObject *tree)

//initialise the prefetch object and set the cache directory
// start the thread only if the file is not local
fEnablePrefetching = gEnv->GetValue("TFile.AsyncPrefetching", 0);
fEnablePrefetching = gEnv->GetValue("TFile.AsyncPrefetching", 1);

if (fEnablePrefetching && file && strcmp(file->GetEndpointUrl()->GetProtocol(), "file")){
SetEnablePrefetchingImpl(true);
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