Out of curiosity are these numbers from single runs or do you average?
Run three times and took the middle in this time.
What are the uncertainties on these numbers? Even on the Rackspace machines I was finding very large variances in my benchmarks, largely due to far outliers. I didn't investigate too far but it seems that a non-trivial fraction of connections were failing.
If cores are in sleep mode, the results are poor. You need to warm cores up somehow. I forget how to disable the deep sleep mode by a command on Linux. (Open a special file and write something?) I believe that Andi knows that. To my experience, 1G network is NOT good enough.
# And I was disappointed a bit because GHC does not automatically do # this inline.
Yeah, this isn't the first time I've been caught assuming that GHC will inline.
I read your code and you export these functions. That's why GHC does not inline them automatically. --Kazu