Re: How to improve db performance with $7K?

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От	PFC
Тема	Re: How to improve db performance with $7K?
Дата	15 апреля 2005 г. 10:07:51
Msg-id	op.so9qe5y2th1vuj@localhost обсуждение исходный текст
Ответ на	Re: How to improve db performance with $7K? (Alex Turner)
Ответы	Re: How to improve db performance with $7K? (Alan Stange)
Список	pgsql-performance

Дерево обсуждения

How to improve db performance with $7K? (Steve Poe, 26 марта 2005 г., 03:24:19 )
Re: How to improve db performance with $7K? (Tom Lane, 26 марта 2005 г., 03:59:24 )
Re: How to improve db performance with $7K? (Steve Poe, 26 марта 2005 г., 04:32:05 )
Re: How to improve db performance with $7K? (Will LaShell, 26 марта 2005 г., 04:03:25 )
Re: How to improve db performance with $7K? ("Joshua D. Drake", 26 марта 2005 г., 04:13:53 )
Re: How to improve db performance with $7K? (Steve Poe, 26 марта 2005 г., 11:25:14 )
Re: How to improve db performance with $7K? (Bjoern Metzdorf, 26 марта 2005 г., 12:59:43 )
Re: How to improve db performance with $7K? (Josh Berkus, 26 марта 2005 г., 23:56:47 )
Re: How to improve db performance with $7K? (Steve Poe, 27 марта 2005 г., 00:16:48 )
Re: How to improve db performance with $7K? (Cott Lang, 29 марта 2005 г., 02:43:39 )
Re: How to improve db performance with $7K? (Steve Poe, 29 марта 2005 г., 08:31:47 )
Re: How to improve db performance with $7K? (Cott Lang, 29 марта 2005 г., 18:53:04 )
Follow-Up: How to improve db performance with $7K? (Steve Poe, 01 апреля 2005 г., 06:01:17 )
Re: Follow-Up: How to improve db performance with $7K? (Thomas F.O'Connell, 01 апреля 2005 г., 12:10:12 )
Re: Follow-Up: How to improve db performance with $7K? (Kevin Brown, 06 апреля 2005 г., 08:45:14 )
Re: Follow-Up: How to improve db performance with $7K? ("Steinar H. Gunderson", 06 апреля 2005 г., 15:28:22 )
Re: Follow-Up: How to improve db performance with $7K? (Thomas F.O'Connell, 07 апреля 2005 г., 08:40:43 )
Re: Follow-Up: How to improve db performance with $7K? (Vivek Khera, 02 апреля 2005 г., 01:23:44 )
Re: Follow-Up: How to improve db performance with $7K? (Will LaShell, 02 апреля 2005 г., 20:21:50 )
Re: How to improve db performance with $7K? (Steve Poe, 27 марта 2005 г., 00:31:21 )
Re: Follow-Up: How to improve db performance with $7K? (PFC, 06 апреля 2005 г., 17:26:36 )
Re: Follow-Up: How to improve db performance with $7K? ("Steinar H. Gunderson", 06 апреля 2005 г., 17:33:56 )
Re: How to improve db performance with $7K? (PFC, 29 марта 2005 г., 13:50:06 )
Re: How to improve db performance with $7K? (Dave Cramer, 29 марта 2005 г., 16:17:13 )
Re: How to improve db performance with $7K? (Greg Stark, 29 марта 2005 г., 22:11:23 )
Re: How to improve db performance with $7K? (Alex Turner, 04 апреля 2005 г., 17:44:08 )
Re: How to improve db performance with $7K? (Steve Poe, 04 апреля 2005 г., 19:52:07 )
Re: How to improve db performance with $7K? (Alex Turner, 04 апреля 2005 г., 23:13:59 )
Re: How to improve db performance with $7K? (Vivek Khera, 04 апреля 2005 г., 23:25:22 )
Re: How to improve db performance with $7K? (Alex Turner, 04 апреля 2005 г., 23:33:40 )
Re: How to improve db performance with $7K? (William Yu, 06 апреля 2005 г., 11:30:57 )
Re: How to improve db performance with $7K? (Alex Turner, 06 апреля 2005 г., 19:35:18 )
Re: How to improve db performance with $7K? (William Yu, 07 апреля 2005 г., 00:01:52 )
Re: How to improve db performance with $7K? (Alex Turner, 07 апреля 2005 г., 02:12:22 )
Re: How to improve db performance with $7K? ("Jim C. Nasby", 07 апреля 2005 г., 02:41:40 )
Re: How to improve db performance with $7K? (Alex Turner, 07 апреля 2005 г., 04:32:54 )
Re: How to improve db performance with $7K? (Alex Turner, 07 апреля 2005 г., 05:12:25 )
Re: How to improve db performance with $7K? (Alex Turner, 07 апреля 2005 г., 05:24:01 )
Re: How to improve db performance with $7K? (Greg Stark, 07 апреля 2005 г., 07:01:24 )
Re: How to improve db performance with $7K? (Alex Turner, 07 апреля 2005 г., 07:06:58 )
Re: How to improve db performance with $7K? (Tom Lane, 07 апреля 2005 г., 08:15:32 )
Re: How to improve db performance with $7K? (Kevin Brown, 14 апреля 2005 г., 05:57:10 )
Re: How to improve db performance with $7K? (Greg Stark, 14 апреля 2005 г., 06:37:39 )
Re: How to improve db performance with $7K? (Kevin Brown, 14 апреля 2005 г., 08:36:15 )
Re: How to improve db performance with $7K? (Tom Lane, 14 апреля 2005 г., 14:44:20 )
Re: How to improve db performance with $7K? (Kevin Brown, 15 апреля 2005 г., 02:03:51 )
Re: How to improve db performance with $7K? (Alex Turner, 15 апреля 2005 г., 02:24:39 )
Re: How to improve db performance with $7K? (PFC, 15 апреля 2005 г., 10:14:04 )
Re: How to improve db performance with $7K? (Tom Lane, 15 апреля 2005 г., 02:42:19 )
Re: How to improve db performance with $7K? (Kevin Brown, 15 апреля 2005 г., 05:03:52 )
Re: How to improve db performance with $7K? (Tom Lane, 15 апреля 2005 г., 05:29:08 )
Re: How to improve db performance with $7K? (Kevin Brown, 16 апреля 2005 г., 00:53:55 )
Re: How to improve db performance with $7K? (Greg Stark, 15 апреля 2005 г., 18:01:52 )
Re: How to improve db performance with $7K? (Vivek Khera, 15 апреля 2005 г., 15:43:46 )
Re: How to improve db performance with $7K? ("Joshua D. Drake", 15 апреля 2005 г., 15:58:34 )
Re: How to improve db performance with $7K? (Vivek Khera, 15 апреля 2005 г., 16:10:20 )
Re: How to improve db performance with $7K? (Kevin Brown, 16 апреля 2005 г., 00:58:35 )
Re: How to improve db performance with $7K? (Matthew Nuzum, 19 апреля 2005 г., 01:44:30 )
Re: How to improve db performance with $7K? ("Jim C. Nasby", 19 апреля 2005 г., 23:08:46 )
Re: How to improve db performance with $7K? (Rosser Schwarz, 14 апреля 2005 г., 14:48:56 )
Re: How to improve db performance with $7K? (Kevin Brown, 16 апреля 2005 г., 01:33:40 )
Re: How to improve db performance with $7K? (Greg Stark, 14 апреля 2005 г., 18:03:50 )
Re: How to improve db performance with $7K? (Bruce Momjian, 18 апреля 2005 г., 20:58:44 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 22:49:56 )
Re: How to improve db performance with $7K? (Alvaro Herrera, 18 апреля 2005 г., 22:56:36 )
Re: How to improve db performance with $7K? (Bruce Momjian, 19 апреля 2005 г., 01:51:38 )
Re: How to improve db performance with $7K? ("Douglas J. Trainor", 07 апреля 2005 г., 08:59:21 )
Re: How to improve db performance with $7K? (, 07 апреля 2005 г., 19:38:44 )
Re: How to improve db performance with $7K? (Alex Turner, 07 апреля 2005 г., 19:46:41 )
Re: How to improve db performance with $7K? (, 07 апреля 2005 г., 20:30:10 )
Re: How to improve db performance with $7K? ("Douglas J. Trainor", 07 апреля 2005 г., 13:56:09 )
Re: How to improve db performance with $7K? (PFC, 15 апреля 2005 г., 10:07:51 )
Re: How to improve db performance with $7K? (Alan Stange, 15 апреля 2005 г., 13:12:02 )
Re: How to improve db performance with $7K? (Dave Cramer, 03 апреля 2005 г., 06:52:14 )
Re: How to improve db performance with $7K? ("Alexander Kirpa", 27 марта 2005 г., 19:23:10 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 14 апреля 2005 г., 15:02:49 )
Re: How to improve db performance with $7K? ("Matthew Nuzum", 14 апреля 2005 г., 15:55:52 )
Re: How to improve db performance with $7K? (Greg Stark, 14 апреля 2005 г., 17:55:27 )
Re: How to improve db performance with $7K? (PFC, 14 апреля 2005 г., 18:42:40 )
Re: How to improve db performance with $7K? (Tom Lane, 14 апреля 2005 г., 18:22:21 )
Re: How to improve db performance with $7K? ("Dave Held", 14 апреля 2005 г., 18:21:20 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 14 апреля 2005 г., 18:32:02 )
Re: How to improve db performance with $7K? (Steve Poe, 14 апреля 2005 г., 18:45:12 )
Re: How to improve db performance with $7K? ("Joshua D. Drake", 14 апреля 2005 г., 19:17:14 )
Re: How to improve db performance with $7K? (William Yu, 18 апреля 2005 г., 08:18:09 )
Re: How to improve db performance with $7K? (Greg Stark, 18 апреля 2005 г., 15:00:52 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 15:17:31 )
Re: How to improve db performance with $7K? (Greg Stark, 18 апреля 2005 г., 15:44:10 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 16:56:55 )
Re: How to improve db performance with $7K? (Jacques Caron, 18 апреля 2005 г., 17:32:38 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 18:16:26 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 18:21:08 )
Re: How to improve db performance with $7K? (Jacques Caron, 18 апреля 2005 г., 18:51:53 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 19:30:07 )
Re: How to improve db performance with $7K? (Jacques Caron, 18 апреля 2005 г., 18:28:41 )
Re: How to improve db performance with $7K? (Greg Stark, 18 апреля 2005 г., 18:24:44 )
Re: How to improve db performance with $7K? (Alan Stange, 18 апреля 2005 г., 17:34:58 )
Re: How to improve db performance with $7K? (John A Meinel, 18 апреля 2005 г., 17:36:22 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 18:18:29 )
Re: How to improve db performance with $7K? ("Joshua D. Drake", 18 апреля 2005 г., 18:28:41 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 18:50:58 )
Re: How to improve db performance with $7K? (Steve Poe, 18 апреля 2005 г., 17:46:52 )
Re: How to improve db performance with $7K? (Alex Turner, 18 апреля 2005 г., 18:19:39 )
Re: How to improve db performance with $7K? (Jacques Caron, 18 апреля 2005 г., 17:42:51 )
Re: How to improve db performance with $7K? ("Jim C. Nasby", 20 апреля 2005 г., 00:03:40 )
Re: How to improve db performance with $7K? (William Yu, 18 апреля 2005 г., 20:37:58 )
Re: How to improve db performance with $7K? ("Dave Held", 14 апреля 2005 г., 18:46:23 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 15 апреля 2005 г., 18:27:24 )
Re: How to improve db performance with $7K? ("Dave Held", 18 апреля 2005 г., 15:20:49 )
Re: How to improve db performance with $7K? ("Jim C. Nasby", 20 апреля 2005 г., 00:05:37 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 18 апреля 2005 г., 18:42:23 )
Re: How to improve db performance with $7K? ("Jim C. Nasby", 20 апреля 2005 г., 00:12:25 )
Re: How to improve db performance with $7K? (Alex Turner, 20 апреля 2005 г., 17:40:41 )
Re: How to improve db performance with $7K? ("Dave Held", 19 апреля 2005 г., 13:34:24 )
Re: How to improve db performance with $7K? (Alex Turner, 20 апреля 2005 г., 18:52:02 )
Re: How to improve db performance with $7K? (William Yu, 21 апреля 2005 г., 05:02:58 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 19 апреля 2005 г., 14:35:46 )
Re: How to improve db performance with $7K? (Bruce Momjian, 19 апреля 2005 г., 16:10:34 )
Re: How to improve db performance with $7K? (, 19 апреля 2005 г., 16:23:17 )
Re: How to improve db performance with $7K? ("Jim C. Nasby", 20 апреля 2005 г., 00:15:31 )
What to do with 6 disks? (Jeff Frost, 20 апреля 2005 г., 01:00:53 )
Re: What to do with 6 disks? ("Jim C. Nasby", 20 апреля 2005 г., 01:56:07 )
Re: What to do with 6 disks? (Josh Berkus, 20 апреля 2005 г., 03:02:32 )
Re: Opteron vs Xeon (Was: What to do with 6 disks?) (Jeff Frost, 20 апреля 2005 г., 04:40:42 )
Re: Opteron vs Xeon (Was: What to do with 6 disks?) ("J. Andrew Rogers", 20 апреля 2005 г., 06:03:21 )
Re: Opteron vs Xeon (Was: What to do with 6 disks?) (Jeff Frost, 20 апреля 2005 г., 06:21:39 )
Re: Opteron vs Xeon (Was: What to do with 6 disks?) (William Yu, 20 апреля 2005 г., 15:09:58 )
Re: Opteron vs Xeon (Was: What to do with 6 disks?) (Vivek Khera, 20 апреля 2005 г., 15:38:11 )
Re: What to do with 6 disks? (Vivek Khera, 20 апреля 2005 г., 15:36:34 )
Re: What to do with 6 disks? (William Yu, 20 апреля 2005 г., 03:07:00 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 19 апреля 2005 г., 16:13:25 )
Re: How to improve db performance with $7K? (Bruce Momjian, 19 апреля 2005 г., 16:16:14 )
Re: How to improve db performance with $7K? (Dawid Kuroczko, 20 апреля 2005 г., 08:55:49 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 19 апреля 2005 г., 16:26:06 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 20 апреля 2005 г., 16:18:52 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 20 апреля 2005 г., 16:44:32 )
Re: How to improve db performance with $7K? ("Dave Held", 20 апреля 2005 г., 18:49:17 )
Re: How to improve db performance with $7K? ("Mohan, Ross", 20 апреля 2005 г., 19:02:15 )


> My argument is that a sufficiently smart kernel scheduler *should*
> yield performance results that are reasonably close to what you can
> get with that feature.  Perhaps not quite as good, but reasonably
> close.  It shouldn't be an orders-of-magnitude type difference.

    And a controller card (or drive) has a lot less RAM to use as a cache /
queue for reordering stuff than the OS has, potentially the OS can us most
of the available RAM, which can be gigabytes on a big server, whereas in
the drive there are at most a few tens of megabytes...

    However all this is a bit looking at the problem through the wrong end.
The OS should provide a multi-read call for the applications to pass a
list of blocks they'll need, then reorder them and read them the fastest
possible way, clustering them with similar requests from other threads.

    Right now when a thread/process issues a read() it will block until the
block is delivered to this thread. The OS does not know if this thread
will then need the next block (which can be had very cheaply if you know
ahead of time you'll need it) or not. Thus it must make guesses, read
ahead (sometimes), etc...

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Дата: 15 апреля 2005 г., 09:58:34
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