Log of /trunk/tree/tree/src/TTreeCacheUnzip.cxx
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43517 -
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Modified
Tue Mar 27 21:54:05 2012 UTC (2 years, 9 months ago) by
pcanal
File length: 42306 byte(s)
Diff to
previous 43516
Fix coding conventions RN9 (Non-static data members begin with 'f' followed by a capital letter; methods begin with a capital letter.);
Revision
42856 -
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Modified
Thu Feb 2 21:09:30 2012 UTC (2 years, 11 months ago) by
pcanal
File length: 42264 byte(s)
Diff to
previous 41891
In TTreeCache remove the (mostly unused) location notion of owner (fOwner) as the ownership is now shared explicitly between a TTree and its TFile. In TTreeCache::UpdateBranches, also migrate the ownership from one file to the other
Revision
37985 -
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Modified
Fri Feb 4 21:37:55 2011 UTC (3 years, 11 months ago) by
pcanal
File length: 42511 byte(s)
Diff to
previous 34234
From Constantin Loizides:
Explicitly check the validity of the zipped buffer before calling
R__unzip, this allow for better error recovery.
Introduce R__unzip_header which does the check and calculate the length values
Revision
31457 -
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Modified
Mon Nov 30 13:36:37 2009 UTC (5 years, 1 month ago) by
brun
File length: 42136 byte(s)
Diff to
previous 31120
From Fabrizio:
In TFileCacheRead add a new virtual function GetUnzipBuffer in order
to avoid InheritsFrom in TBasket::ReadBasketBuffers.
In TTreeCacheUnzip optimizations related to CPU cycles and memory.
Related fixes to TFileCacheRead. Also comment "if gDebug" statements.
In TXNetFile fixes related to the reporting of TTreePerfStats.
Revision
23685 -
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Added
Wed May 7 15:18:39 2008 UTC (6 years, 8 months ago) by
brun
File length: 34596 byte(s)
Introducing a parallel unzipping algorithm for pre-fetched buffers. Since we already know what buffers are going to be read, we can decompress a few of them in advance in an additional thread and give the impression that the data decompression comes for free (we gain up to 30% in reading intensive jobs).
The size of this unzipping cache is 20% the size of the TTreeCache and can be modified with TTreeCache::SetUnzipBufferSize(Long64_t bufferSize). Theoretically, we only need one buffer in advance but in practice we might fall short if the unzipping cache is too small (synchronization costs).
This experimental feature is disabled by default, to activate it use the static function TTreeCache::SetParallelUnzip(TTreeCacheUnzip::EParUnzipMode option = TTreeCacheUnzip::kEnable). The possible values to pass are: TTreeCacheUnzip::kEnable to enable it,TTreeCacheUnzip::kDisable to disable it and TTreeCacheUnzip::kForce to force it. Since it will only work if you have more than one core, the TTreeCacheUnzip::kForce option is useful to run it even if you have only one cpu (to measure the overhead, for example).
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