I'm still spending some time managing my development servers. Backing up virtual machine images is a CPU intensive operation, so I'd imagine my 8 core server wouldn't have a problem with it. I was wrong, for some strange reason, 7Zip was using only one core. After some tests, I've found out the relevance of the compression method:
| method | #cores used |
| zip | 1 |
| 7z | 2 |
| bzip2 | 8 |
I've yet to measure the core usage efficiency, but until otherwise proven bzip2 will be my default compression method on this servers.
PS: I'd expect 7z to have a better compression rate than bzip2, but the time frame to compress images is crucial on these servers.
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