Severe performance degradation on Linux

[Maarten Hoes]

Hi,


For what its worth, i can easily reproduce the script takes fairly long
(about ~50 seconds on my vm's) to complete on both Ubuntu 14.04 and Fedora
21, both with the distro supplied binaries and a recent master.

I ran the script using strace -f. It shows a lot of calls on futex(
'FUTEX_WAIT_PRIVATE'), though im not sure how relevant that may be. I
attached the strace output.


- Maarten
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