Re: sync_file_range()
От | Simon Riggs |
---|---|
Тема | Re: sync_file_range() |
Дата | |
Msg-id | 1150746813.2587.98.camel@localhost.localdomain обсуждение исходный текст |
Ответ на | Re: sync_file_range() (Greg Stark <gsstark@mit.edu>) |
Список | pgsql-hackers |
On Mon, 2006-06-19 at 15:04 -0400, Greg Stark wrote: > > We fsync the xlog at transaction commit, so only the leading edge needs > > to be synced - would the call help there? Presumably the OS can already > > locate all blocks associated with a particular file fairly quickly > > without doing a full cache scan. > > Well in theory the transaction being committed isn't necessarily the "leading > edge", there could be more work from other transactions since the last work > this transaction actually did. Near enough. > > Other files are fsynced at checkpoint - always all dirty blocks in the > > whole file. > > Well couldn't it be useful for checkpoints if it there was some way to know > which buffers had been touched since the last checkpoint? There could be a lot > of buffers dirtied since the checkpoint began and those don't really need to > be synced do they? Qingqing had a proposal for something like that, but seemed not worth it after analysis. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com
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