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hepsim:files [2018/08/01 11:09] hepsim17 [ProIO file format] |
hepsim:files [2018/08/30 01:07] (current) hepsim17 |
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It uses varints for integer values (and, by design, for 4-momenta and vertex). | It uses varints for integer values (and, by design, for 4-momenta and vertex). | ||
It's efficient format for events with large number of particles. | It's efficient format for events with large number of particles. | ||
- | The file sizes are typically 30% smaller than traditional ROOT with fixed bytes for floats and integer values. | + | The file sizes for EVGEN files are typically 30% smaller than for traditional ROOT files (with fixed bytes for floats and integers). |
+ | The file format is self-describing. Suported by C++, Java/Jython (read/ | ||
+ | <fc #000080> | ||
+ | Supported by: </ | ||
===== ProIO file format ===== | ===== ProIO file format ===== | ||
- | [[https:// | + | [[https:// |
It is more efficient file format than ProMC when the number of events in the files larger than 64k, | It is more efficient file format than ProMC when the number of events in the files larger than 64k, | ||
- | and when number of particles in files is not large. For Monte Carlo records, the files created by ProIO are about 10-20% smaller in size than those from ProMC. | + | and when number of particles in files is not large (<100). For the latter |
+ | For pp collision events with large number of particles, ProMC and ProIO have same file sizes when | ||
+ | ProIO use mc.proto files with VarintPackedParticles messages (arrays with 4-momenta converted to varints). | ||
+ | See some tests in http:// | ||
- | ===== ROOT file format ===== | ||
- | ROOT files are used to keep fast detector simulations from Delphes | + | |
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+ | <fc # | ||
+ | Supported by: </ | ||
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[[https:// | [[https:// | ||
Geant4 simulation (and reconstruction) using " | Geant4 simulation (and reconstruction) using " | ||
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+ | <fc #000080> | ||
+ | Supported by Jas4PP</ | ||
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+ | ===== ROOT file format ===== | ||
+ | |||
+ | ROOT files are used to keep fast detector simulations from Delphes | ||
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