hadd - Man Page

Synopsis

usage: hadd [-a] [-f] [-f[0-9]] [-fk] [-ff] [-k] [-L] [-Ltype] [-O] [-T] [-v V] [-j J] [-dbg] [-d D] [-n N] [-cachesize CACHESIZE] [-experimental-io-features EXPERIMENTAL_IO_FEATURES] TARGET SOURCES

Description

This program will add histograms, trees and other objects from a list of ROOT files and write them to a target ROOT file. The target file is newly created and must not exist, or if -f ("force") is given, must not be one of the source files.

Options

-a

Append to the output

-f

Force overwriting of output file

-f[0-9]

Gives the ability to specify the compression algorithm i and level j

of the target file, by passing the number i*100 + j, e.g. -f505. The

last digit (j) can be set from 0 = uncompressed to 9 = highly

compressed. The first digit (i) is 1 for ZLIB, 2 for LZMA, 4 for LZ4

and 5 for ZSTD. Recommended numbers are 101 (ZLIB), 207 (LZMA), 404

(LZ4), 505 (ZSTD). The default value for this flag is 101

(kDefaultZLIB). See ROOT::RCompressionSetting and TFile::TFile

documentation for more details.

-fk

Sets the target file to contain the baskets with the same compression

as the input files (unless -O is specified). Compresses the meta data

using the compression level specified in the first input or the

compression setting after fk (for example 206 when using -fk206)

-ff

The compression level use is the one specified in the first input

-k

Skip corrupt or non-existent files, do not exit

-L

Read the list of objects from FILE and either only merge or skip those

objects depending on the value of "-Ltype". FILE must contain one

object name per line, which cannot contain whitespaces or '/'. You can

also pass TDirectory names, which apply to the entire directory

content. Lines beginning with '#' are ignored. If this flag is passed,

"-Ltype" MUST be passed as well.

-Ltype

Sets the type of operation performed on the objects listed in FILE

given with the "-L" flag. "SkipListed" will skip all the listed

objects; "OnlyListed" will only merge those objects. If this flag is

passed, "-L" must be passed as well.

-O

Re-optimize basket size when merging TTree

-T

Do not merge Trees

-v

Explicitly set the verbosity level: 0 request no output, 99 is the

default

-j

Parallelize the execution in 'J' processes. If the number of processes

is not specified, use the system maximum.

-dbg

Enable verbosity. If -j was specified, do not not delete partial files

stored inside working directory.

-d

Carry out the partial multiprocess execution in the specified