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Old 12-08-2004, 09:13 AM   #1
Andrastus
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Having problems with Kernel AIO with ASE


Hi there.

I'm having problems getting ASE 12.5.3 to run with kernel async io. We are using RH AS 3 with kernel 2.4.21-4.

Any one of you gurus have an idea on how to enable this? Is it a linux setting I have to change or a ASE config file setting?

TIA.

PS: if there is anything else I forgot to add, please just ask.
 
Old 12-10-2004, 08:49 AM   #2
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I'm not sure if this link is of any use, but it implies that you have to have a version of ASE built for the 2.4 kernel:
http://www.dbforums.com/showthread.p...oto=nextoldest

A sybase PDF (here: http://www.sybase.com/content/102490..._ase_final.pdf ) implies that Async IO is enabled by default

Out of curiosity, how do you know it's _not_ running in async mode ? I'm curious becauese I have to test this shortly
 
Old 12-10-2004, 11:48 AM   #3
Andrastus
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Hey.

The ASE log file reports that its using Posix async I/O and not the preferred Kernel async I/O. As far as I know, ASE will try and use kaio when available, and if not, use posix aio.

We got a guy from Sybase into the office today. He brought along a c proggie to test if the kernel is running kaio. The test successfully determined that our RHAS is running with kaio enabled, but then way is Sybase not using it? Some reports claim that Sybase just report it incorrectly, although it does not make sense to me.

The guy from Sybase was running ASE on RH Enterprise with kaio. We are using RHAS 3 and it reports posix. The only difference we could see is that we were running a earlier version of glibc (we're running 2.3.2-95.3 and he 2.3.2-95.27, both on kernel 2.4.21-4).

Think glibc can be the reason? Where can I find the latest or at least version 2.3.2-95.27? It's worth a try.
 
Old 12-15-2004, 07:53 AM   #4
Andrastus
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Seems like an update to your libstdc++ ca fix this problem. Where can I find the latest version of libstdc++ on a non-networked machine?
 
  


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