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Interview Question for Software Engineer: Platforms at Google:
Apr 4, 2011
You have two programs, A and B. Each of them takes 1 minute to run separately on a Linux machine, when run on a freshly booted system. What can you tell me about the two programs if: a) when run together, they take 2 minutes to run b) when run together, they take 1 minute to run c) when run together, they take 30 seconds to run
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May 23, 2012
The trick to answering the third option seems to have to do with multithreading as stated by aaron. As he says, it may be prefetching/caching of data. It may also be the case that under load the size of a thread pool increases (that is, under a single thread of execution no multithreading occurs but under > 1 thread, a thread pool is increased to 4) such that the program executes faster.
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by aaron: