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Top Forums Shell Programming and Scripting Transpose columns to Rows : Big data Post 302443773 by kurumi on Tuesday 10th of August 2010 04:13:18 AM
Old 08-10-2010
Quote:
Originally Posted by alister
A test run on a small (compared to 2,000x600,000) 500x1000 matrix shows that your i/o heavy approach takes 2m35s versus 5s for the ram hungry solution.
Ok, so the OP has 2000x 600000 columns. that is over 2GB in file size. do you slurp more than 2GB into memory to do such stuff? What about other processes?

Last edited by kurumi; 08-10-2010 at 07:05 AM..
 

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cvm-checkpassword(8)					      System Manager's Manual					      cvm-checkpassword(8)

NAME
cvm-checkpassword - checkpassword interface for CVM modules SYNOPSIS
cvm-checkpassword CVM Command [ arguments ... ] DESCRIPTION
http://cr.yp.to/checkpwd/interface.html http://untroubled.org/cvm/cvm.html See the above links for details on both the CVM and checkpassword interfaces. To use this interface with qmail-pop3d(8), use the following command line: /var/qmail/bin/qmail-popup cvm-checkpassword cvm-unix /var/qmail/bin/qmail-pop3d ./Maildir/ Note: The default mode of operations for this module is to attempt to split a domain name from the account name. If this is not desirable, set $CVM_ACCOUNT_SPLIT_CHARS to an empty string. SEE ALSO
cvm-pwfile(8), cvm-qmail(8), cvm-unix(8), cvm-sql(8), cvm-vmailmgr(8), cvm-benchclient(8), cvm-testclient(8) http://untroubled.org/cvm/cvm.html cvm-checkpassword(8)
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