Messages in this thread | | | Date | Fri, 15 Jan 1999 14:40:21 +0700 | From | Agus Budy Wuysang <> | Subject | Re: MM deadlock [was: Re: arca-vm-8...] |
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Andrea Arcangeli wrote: > > On Wed, 13 Jan 1999, Alan Cox wrote: > > > > >> Could somebody spare a minute to explain why is that so, and what > > > >> needs to be done to make SHM swapping asynchronous? > > > > > > > Maybe because nobody care about shm? I think shm can wait for 2.3 to be > > > > improved. > > > > > > "Nobody"? Oracle uses large shared memory regions for starters. > > > > All the big databases use large shared memory objects. > > I was't aware of that. I noticed that also postgres (a big database) uses > shm but it's _only_ something like 1 Mbyte (at least during trivial > usage). With my current code such 1 Mbyte would not be touched unless
Our current database size 1.6Gb, locks & buffers are using "large" SHM heavily. Due to Linux SHMMAX = 16M, allocation is divided into serveral 16M segments.
current database buffers = 130,000 * 1024 bytes locks = 65536 * 18 bytes
Quick Spec: Dual PPro 200MHz, 256Mb Ram Kernel 2.2.0-pre6 Progress 7.3C08 via latest iBCS 2.1.x emulator
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