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I am really confused between libev and libuv.

Is libuv just a wrapper on libev on POSIX systems?

If not where does it differ?

mehdi lotfi
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user1775896
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2 Answers2

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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:

  1. 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.

  2. 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.

Steve Lorimer
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For completeness, as of today, we still don't use edge-triggered I/O on Linux.

saghul
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