[teddyuk]

How common are get time calls so that they would actually be an issue?

I've worked on quite a few systems and can't think of a time where an api for getting the time would have been called so much that it would affect performance?

[tyingq]

Timestamped logs, transaction timeouts, http keepalive timeouts, cache expiration/eviction, etc.

Apache and nginx for example, both call gettimeofday() a lot.

Edit: Quick google searches indicate software like redis and memcached also call it quite often.

[Anderkent]

So does cassandra.

[jankedeen]

Any application code that includes logging of any sort is going to grab time. All of my code (quite a private set and scientific in nature) calls time() at critical points with identifiers so I can easily investigate issues.