#3758: Huge regression in concurrent app performance and reliability under
threaded runtime
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Reporter: bos | Owner: simonmar
Type: bug | Status: new
Priority: high | Milestone: 6.12.2
Component: Runtime System | Version: 6.12.1
Resolution: | Keywords:
Difficulty: | Os: Linux
Testcase: | Architecture: x86_64 (amd64)
Failure: Runtime crash |
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Comment (by bos):
Simon, thanks for looking into this.
I tried the same benchmarks, only this time using a Mac running ab as the
client over a gigabit ethernet connection.
With 6.12.1, {{{-N2 -qg}}}, I get good numbers: just below 15,000 requests
per second.
With plain {{{-N2}}} (hence using parallel GC), the numbers don't take as
big a dive as when I was running client and server on a single box, but
they still drop to about 7,500 requests per second, a 50% reduction in
throughput.
Since the server has nothing else running on it in this case, I really do
have 2 CPUs available. I think :-)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3758#comment:8>
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