On Sun, Mar 24, 2013 at 1:47 AM, Ken <[email protected]> wrote: > Off the top of my head (without bothering to dig into the code): > > - there's some O(N) operation in node relating to number of workers > like looking them up in an array > - the operating system is introducing latency, e.g. due to context > switching or paging. Have you tried tracking all the potentially relevant > system performance stats in parallel with your runs to see if any of them > spike? > > Yes, strace -c seems to suggest that write() itself gets slower: https://gist.github.com/baudehlo/5204847
> I'm curious why sending messages is the key performance metric? The > reason I suggested an alternate benchmark is because the difference between > sending 220K/s and 180K/s would only seem to matter if the receiver could > somehow do more net work at the higher rate. I'm struggling to imagine > what task it could perform that wouldn't make that difference immaterial. > That performance is beyond what I personally need, for sure. The results are more just a curiosity. But imagine a system that needs to perform millions of operations per second (think of stock trading systems). They are currently built in Java or C/C++ and use threads for performance to ensure scalability on multi-CPU boxes. They use systems like this one which can perform 130M operations/sec: http://psy-lob-saw.blogspot.ca/2013/03/single-producerconsumer-lock-free-queue.html- I was mostly just curious to see what level of ops/sec cluster's child node communication protocol could achieve (and yes I realize why it has so much higher overhead - I wasn't expecting close to 130M/s). Clearly cluster.send() isn't the right way to build that in Node, but after I got the results I just wanted to know why it slows down so dramatically with more nodes. Matt. -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
