With the winter season coming up try this if you are feeling cold and are working on a laptop.
$ openssl speed
Openssl is a nice way of benchmarking your processor's performance. It tries to calculate the number of mathematical calculations (md5, sha, aes, blowfish et. al hashes) your processor can do in given time. the higher number of calculations, the better

And yes its terribly heats up your CPU at the same time..
If your CPU hasnt heated up yet then try running several openssl benchmarks at the same time.. write a shell script like this...
#!/bin/bash
openssl speed &
openssl speed &
...
...
[repeat 20 lines]
Right now above script is running on the new proliant server and its fans are making such a loud noise as its benchmarking