Perl Modules CPAN Error Memory Allocation

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i was trying to install some perl modules to ispconfig and i kept on getting the error with memory allocation problem

perl -MCPAN -e shell
install HTML::Parser
install DB_File
install Net::DNS (when prompted to enable tests, choose “no”)
install Digest::SHA1

Going to read />Could not pipe[/bin/gzip --decompress --stdout |]: Cannot allocate memory at /usr/lib/perl5/5.8.8/CPAN.pm line 5726, line 3.

To fix: Free system RAM

Most of my system RAM were consumed by httpd and mysql. so i stopped them temporarily and bingo! it worked for me. i was sucessfully able to install perl modules.

/etc/init.d/httpd stop
/etc/init.d/mysqld stop