groot-bench

groot-bench gathers a few programs to benchmark the read/write performances of groot wrt ROOT/C++.

input data

• root://eospublic.cern.ch//eos/root-eos/cms_opendata_2012_nanoaod/Run2012B_DoubleElectron.root (1.8Gb, 23571931 entries)
• toy-data (float64 and/or []float64)

results

• Go-HEP v0.27.0 (Go-1.14), ROOT-6.20/04 (g++-10.1.0) (both on local file)

name                                  time/op
ReadCMSScalar/GoHEP/Zlib-8            3.92s ± 2%  // only read scalar data
ReadCMSScalar/ROOT-TreeBranch/Zlib-8  7.98s ± 2%  // ditto
ReadCMSScalar/ROOT-TreeReader/Zlib-8  6.60s ± 2%  // ditto

name                                  time/op
ReadCMSAll/GoHEP/Zlib-8               18.4s ± 1%  // read all branches
ReadCMSAll/ROOT-TreeBranch/Zlib-8     30.4s ± 2%  // ditto
ReadCMSAll/ROOT-TreeReader/Zlib-8     [N/A]       // comparison meaningless (b/c of loading-on-demand)

name                               time/op
ReadScalar/GoHEP/None-8            705ms ± 2%
ReadScalar/ROOT-TreeBranch/None-8  941ms ± 2%
ReadScalar/ROOT-TreeReader/None-8  1.39s ± 2%
ReadScalar/GoHEP/LZ4-8             751ms ± 2%
ReadScalar/ROOT-TreeBranch/LZ4-8   1.09s ± 2%
ReadScalar/ROOT-TreeReader/LZ4-8   1.53s ± 1%
ReadScalar/GoHEP/Zlib-8            1.31s ± 1%
ReadScalar/ROOT-TreeBranch/Zlib-8  2.18s ± 1%
ReadScalar/ROOT-TreeReader/Zlib-8  2.62s ± 1%

• Go-HEP v0.26.1-0.20200511085556-0f7b59f24c5e

name                     time/op
ReadScalar/GoHEP/None-8  1.27s ± 3%
ReadScalar/GoHEP/LZ4-8   1.39s ± 1%
ReadScalar/GoHEP/Zlib-8  4.10s ± 1%

toy-data

generation

$> make binaries
$> ./bin/gen-data-scalar.go -h
Usage of gen-data-scalar:
  -cpu-profile string
    	path to the output CPU profile
  -lvl int
    	compression level to use (if any) (default -1)
  -nevts int
    	number of events to generate (default 10000000)
  -o string
    	path to output ROOT file to generate (default "scalar.root")
  -seed uint
    	seed for random number generation (default 1234)
  -t string
    	name of the output ROOT tree to generate (default "tree")
  -zip string
    	compression to use (if any)

no-compression

./bin/gen-data-scalar -zip=none -o ./testdata/scalar-none.root

lz4

./bin/gen-data-scalar -zip=lz4 -lvl=0 -o ./testdata/scalar-lz4-0.root
./bin/gen-data-scalar -zip=lz4 -lvl=1 -o ./testdata/scalar-lz4-1.root
./bin/gen-data-scalar -zip=lz4 -lvl=6 -o ./testdata/scalar-lz4-6.root
./bin/gen-data-scalar -zip=lz4 -lvl=9 -o ./testdata/scalar-lz4-9.root

zlib

./bin/gen-data-scalar -zip=zlib -lvl=0 -o ./testdata/scalar-zlib-0.root
./bin/gen-data-scalar -zip=zlib -lvl=1 -o ./testdata/scalar-zlib-1.root
./bin/gen-data-scalar -zip=zlib -lvl=2 -o ./testdata/scalar-zlib-2.root
./bin/gen-data-scalar -zip=zlib -lvl=3 -o ./testdata/scalar-zlib-3.root
./bin/gen-data-scalar -zip=zlib -lvl=6 -o ./testdata/scalar-zlib-6.root
./bin/gen-data-scalar -zip=zlib -lvl=9 -o ./testdata/scalar-zlib-9.root

zstd

./bin/gen-data-scalar -zip=zstd -o ./testdata/scalar-zstd.root