I use my Profiler.h program to profile just the execution of reading the file and inserting into the mongodb. Here is my output and you can see I achieved ~19 million inserts in less than 5 min. Would love to see your results.
Number of entries in apache.log 19,220,478 AMI: ami-4a0df923 Operating System: Ubuntu 10.04 EC2 Size: xlarge Mongodb: stable 1.6.5
./logs main() started the env is in dev mode connected ok CPU Calculation: 682,968,964,864 Time took 257.00 seconds. count of logs.ip: 19,220,478 main() completed