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Fix read concurrency to work in parallel count

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When the prefetch size is limited to the multipart size, the entire parallel logic of the read flow does not have an opportunity to use parallel get.
This fix increases the read performance significantly over our own s3 on-premise solution.
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Guy 2015-11-30 18:38:15 +02:00
parent d7a4fc2927
commit 6067af6ef1
1 changed files with 1 additions and 1 deletions
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src/fdcache.cpp
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@ -1448,7 +1448,7 @@ ssize_t FdEntity::Read(char* bytes, off_t start, size_t size, bool force_load)
// load size(for prefetch)
size_t load_size = size;
if(static_cast<size_t>(start + size) < pagelist.Size()){
size_t prefetch_max_size = max(size, static_cast<size_t>(S3fsCurl::GetMultipartSize()));
size_t prefetch_max_size = max(size, static_cast<size_t>(S3fsCurl::GetMultipartSize() * S3fsCurl::GetMaxParallelCount()));
if(static_cast<size_t>(start + prefetch_max_size) < pagelist.Size()){
load_size = prefetch_max_size;