Hello rooters, I'm writing data like in the following example (using root 3.01/06, with a '+' in the pragma statement for MyClass): { MyClass *cls = new MyClass; TFile file("name", "RECREATE", "title", 0); TTree tree("name, "title"); tree.Branch("MyClass", "MyClass", &cls, 320000, 0); for (int i=0; i<1e6; i++) { FillDataIntoMyClass(&cls); tree.Fill(); } file.Write(); delete cls; } Because this is rather slow, I used gprof to find out where the time is spend and if I trust its output, only ~15% of all the time (CPU time, which should not include I/O) is spend in my part of the program. This means about 85% of the CPU-time is spent in root (I/O). In this example speed is really critical. Is there a way to accelerate the root output? I don't think that it is a question of hardware limitation because the machine and disks are really powerfull. Rem: MyClass contains four arrays. Two about 1kB, and two around 8kB. (around 18kB in total) Thanks in advance, Thomas.
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