Messages in this thread | | | Subject | Re: wild imbalance in kswapd state | Date | Tue, 18 Aug 1998 13:17:07 +0200 | From | Olaf Titz <> |
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> Has anyone actually verified whether or not the dcache is indeed a > win on large news servers with 50-100 GB of disk at all?
This may be off optic a bit, but if you have such a big spool you are strongly advised to use INN 2.1 and the storage API. With classic spool directories become so huge that performance sucks big time, dcache or not. (The most expensive operation is open(...,O_CREAT,...) which _must_ traverse the whole directory, and the second is link() which must do likewise, for each and every article received. You don't fit 10,000+ complete directories in any dcache.)
Even the timehash storage is a big win over classical layout because the directories it uses are smaller, the access pattern much more well-behaved (only one directory gets written to at a time) so that the dcache actually helps, and the links are unnecessary.
olaf
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