failed to allocate memory (NoMemoryError)

/usr/local/lib/ruby/1.8/pstore.rb:349:in `dump'
/usr/local/lib/ruby/1.8/pstore.rb:349:in `dump'
/usr/local/lib/ruby/1.8/pstore.rb:330:in `transaction'
./tdiary.rb:995:in `parser_cache'
./tdiary.rb:868:in `store_parser_cache'
./tdiary/defaultio.rb:144:in `transaction'
./tdiary.rb:1516:in `load'
./tdiary.rb:1501:in `initialize'
index.rb:35:in `new'
index.rb:35