问题
I am really confused between libev and libuv.
Is libuv just a wrapper on libev on POSIX systems?
If not where does it differ?
回答1:
No longer, since libuv-v0.9
Here is the libuv github issue which tracked the removal of libev from libuv.
The reasons for removal are, to quote from the above linked issue:
In case any project watchers are wondering, libev served us well but:
It only supports level-triggered I/O. On Linux, we want to use edge-triggered mode - it cuts down the number of syscalls by a substantial margin.
libev's inner loop does a lot of things we don't really need. Gutting the inner loop like we did in 649ad50 gave a 40% performance increase on some benchmarks.
回答2:
For completeness, as of today, we still don't use edge-triggered I/O on Linux.
来源：https://stackoverflow.com/questions/25174517/is-libuv-just-a-wrapper-on-libev-on-posix-systems