[Haskell-cafe] Re: sendfile leaking descriptors on Linux?
thomas.dubuisson at gmail.com
Thu Feb 11 16:17:49 EST 2010
Bardur Arantsson <spam at scientician.net> wrote:
>> then do errno <- getErrno
>> if errno == eAGAIN
>> then do
>> threadDelay 100
>> sendfile out_fd in_fd poff bytes
>> else throwErrno "Network.Socket.SendFile.Linux"
>> else return (fromIntegral sbytes)
> That is, I removed the threadWaitWrite in favor of just adding a
> "threadDelay 100" when eAGAIN is encountered.
> With this code, I cannot provoke the leak.
> Unfortunately this isn't really a solution -- the CPU is pegged at
> ~50% when I do this and it's not exactly elegant to have a hardcoded
> 100 ms delay in there. :)
I don't think it matters wrt the desired final solution, but this is
NOT a 100 ms delay. It is a 0.1 ms delay, which is less than a GHC
time slice and as such is basically a tight loop. If you use a
reasonable value for the delay you will probably see the CPU being
almost completely idle.
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