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Top Forums Shell Programming and Scripting Parallel Runs in UNIX/Linix Shell Scripting Post 302975465 by Don Cragun on Monday 13th of June 2016 03:55:09 PM
Old 06-13-2016
I do not understand what you're trying to do.

Are you saying that you want 100 copies of split running at the same to split a single file into 100 chunks? That is not the way split works! And, the split utility takes at most two file operands; not an unlimited number as indicated by the filec... in your example split command (and the comma in filea, will be used as the base part of the names of your output files (the first four of which will be named filea,aa, filea,ab, filea,ac, and filea,ad) assuming you remove the remaining file operands which would cause split
to fail with a syntax error.

You say your input file has about 1 million records. Are the records fixed length or variable length? Are you absolutely positive that files of 2,097,152 bytes will contain complete records (i.e., that the start of a record won't be in one of your split files and the end of that record won't be at the start of the next split file)?

After you have created a bunch of files (all but the last of which contain exactly 2,097,152 bytes), what do you want to do with these files? You say you want to run them. Are each of these 2,097,152 byte files a shell script???

Does your system have 100 CPUs? If not, trying to run 100 jobs in parallel will slow down processing; not provide faster processing!

Are you going to distribute the output files from split onto different disk drives? Do you have 100 different disk drives? Will running these 100 files in parallel overwhelm your I/O subsystem?

What operating system are you using?

What shell are you using?
 

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split(1)						      General Commands Manual							  split(1)

NAME
split - split a file into pieces SYNOPSIS
line_count] suffix_length] [file [name]] nsuffix_length] [file [name]] Obsolescent n] [file [name]] DESCRIPTION
reads file and writes it in pieces (default 1000 lines) onto a set of output files. The name of the first output file is name with appended, and so on lexicographically, up to (only ASCII letters are used, a maximum of 676 files). If no output name is given, is the default. If no input file is given, or if is given instead, the standard input file is used. Options recognizes the following command-line options and arguments: The input file is split into pieces line_count lines in size. suffix_length letters are used to form the suffix of the output filenames. This option allows creation of more than 676 output files. The output file names created cannot exceed the maximum file name length allowed in the directory containing the files. The input file is split into pieces n bytes in size. The input file is split into pieces n x 1024 bytes in size. No space separates the n from the The input file is split into pieces n x 1048576 bytes in size. No space separates the n from the The input file is split into pieces n lines in size. This option is obsolescent and is equivalent to using the option. EXTERNAL INFLUENCES
Environment Variables determines the locale for the interpretation of text as single- and/or multi-byte characters. determines the language in which messages are displayed. If or is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty variable. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. SEE ALSO
csplit(1). STANDARDS CONFORMANCE
split(1)
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