Re: [Monetdb-developers] monetdbd takes too long to start

Hi, just used getnameinfo() instead of gethostbyaddr() in openConnectionTCP() and it doesn't gain any time improvement. In addition, inspecting openConnectionUDP(), I saw that it uses getnameinfo() instead of gethostbyaddr() and it is slow as well. What I found, though, is that the trouble is caused by INADDR_ANY (i.e., 0.0.0.0). If 127.0.0.1 or a specific, external ip is given, then both getnameinfo() and gethostbyaddr() return instantaneously. After all, is there any point of resolving 0.0.0.0? Anyway, regardless the ip given, I think that resolving should be done in a timely manner, don't you think. Time permitting, I shall further inspect the problem to find out whether it is an issue in glibc or specific to system configuration (of Ubuntu). Regards, Babis On Sat, Dec 10, 2011 at 6:40 PM, Charalampos Nikolaou wrote:

That is what I was intending to do, but first I opted to ask the experts.

Regards, Babis

On Sat, Dec 10, 2011 at 2:15 PM, Stefan Manegold wrote:

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Babis,

since we don't have Ubuntu machines running and (hence) are no Ubuntu experts, please feel free to replace gethostbyaddr() and gethostbyname() by getaddrinfo() and getnameinfo() in your local checkout of MonetDB and report what you experience.

Stefan

On Sat, Dec 10, 2011 at 01:01:15PM +0200, Charalampos Nikolaou wrote:

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Unfortunately, disabling IPv6 still requires exactly the same amount of time.

Any other suggestions?

Thanks, Babis

On Sat, Dec 10, 2011 at 10:23 AM, Fabian Groffen wrote:

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On 10-12-2011 03:06:39 +0100, Stefan de Konink wrote:

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Op 10-12-11 03:02, Charalampos Nikolaou schreef:

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Have you investigated this issue? Do you know what causes such a delay? Is it present in other OSs too?

On Ubuntu, is by any chance IPv6 enabled? This could already count for a 5s resolving time-out, based on the fallback scenario where IPv4 is used anyway.

Could very well be.  It's a Ubuntu-only "feature".

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