Posted 2009-08-18 22:40:00 GMT
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Stefano Casazza's excellent, and now newly released, ULib framework pulled ahead of teepeedee2 (11757.27 requests per second vs 11313.29 for tpd2). This framework shares many of the goals of teepeedee2: a stripped down set of language features used, and is a general system for doing all sorts of IO (for example, it includes a nicely Object Orientated HTTP client).
I'm curious about the search engine component of ULib, but I've been too busy to check it out. Maybe I will be able to have a look at it another time. Please feel free to comment if you've used it.
It diverges from tpd2 with the fact that (like the original teepeedee) it is written in C++, so doesn't have to contend with Lisp related idiocies regarding pointers (teepeedee2 has to pass both the start and end offsets as well as a pointer to array itself instead of just a pointer and a length, as displaced arrays are a performance joke under SBCL). Additionally, ULib can run on MS Windows and has some documentation, which puts teepeedee2 to shame.
Stefano introduced me to an interesting pair of socket options — TCP_DEFER_ACCEPT (in teepeedee2 now), which is a stripped down version of FreeBSD's kevent accept filters that means the accept(2) system call will only return if at least one data packet has arrived, and TCP_CORK. I was using TCP_CORK before, though with the writev mechanism it is not so generally useful, but I found it to cause the time waiting for the buffer to be flushed to be charged to the teepeedee2 process. Stefano never uncorks the socket (this is fine for Connection: close mode as the close(2) will flush everything), so never incurs the penalty. He measured a nearly 10% benchmark increase from using it. I tried it but without determining that there was any measurably significant benefit.
(On a related note, what is happening with the new accept4(2) syscall which should save setting O_NONBLOCK with fcntl? The wrapper for it seems not to have made it to libc yet.)
It's fine to see a competitive framework to compare teepeedee2 to, and I hope Stefano and I will continue to share ideas. ULib is officially the fastest — let's see if I can squeeze out another 4%.
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