Joel Liu's Library tagged mass → View Popular

06 Mar 08

There is a qmail patch (big concurrency) that will allow running more
remotes. The default kernal in RedHat 6.1 limits you to 512 total processes
and half that per user. I have recompiled the kernel for 2560 total
processes and 2048 per user. See the file
/usr/src/linux/include/linux/tacks.h.
I can get about 50K emails per hour using 400 remotes. That would take 10
hours with your list. The qmail queue size seems to stabilaze between 10K
and 15K during the run. There is usually between 300-400 remotes running.
1 more annotations...
- I am currently experimenting with bypassing qmail altogether. Using shared
  memory I fork off 1000 child processes to chew on a list in parallel. Each
  child will call qmail-inject only if its direct attempt fails. My testing
  is still rough but it looks like I can get a 5 to 10 fold improvement.

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