Re: [PERFORM] Disk writes
Hi, Reimer, carlosreimer wrote: > There is some performance problems with the server and I discovered with > vmstat tool that there is some process writing a lot of information in > the disk subsystem. [..] > I could I discover who is sending so many data to the disks? It could be something triggered by your crontab (updatedb comes in my mind, or texpire from leafnode etc.). Another idea would be that you have statement logging on, or something else that produces lots of kernel or syslog messages[1], and your syslogd is configured to sync() after every line... HTH, Markus [1] We once had such a problem because an ill-compiled kernel having USB verbose logging on... -- Markus Schaber | Logical Tracking&Tracing International AG Dipl. Inf. | Software Development GIS Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [PERFORM] Disk writes
On Thu, 2006-07-27 at 20:25, carlosreimer wrote: > Hi, > > We've a fedora core 3 box with PostgreSQL 8.0. > > There is some performance problems with the server and I discovered > with vmstat tool that there is some process writing a lot of > information in the disk subsystem. > > I stopped the database and even so vmstat showed the same rates of > disk writes. > > I could I discover who is sending so many data to the disks? Does top show any processes running? On my FC4 laptop, the one that kept cranking up all the time was prelink. I don't really care if it takes an extra couple seconds for an app to open each time, so I disabled that. The other process I've seen do this, on older flavors of linux mostly, is kswapd erroneously writing and reading the swap partition a lot. Seems to happen when the swap partition is smaller than physical memory, and there's a lot of other I/O going on. But I think that got fixed in the 2.6 kernel tree. ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [PERFORM] Disk writes
> I could I discover who is sending so many data to the disks? Documentation/laptop-mode.txt in the Linux kernel tree has some instructions how to track down unwanted disk writes. -- Florian Weimer<[EMAIL PROTECTED]> BFK edv-consulting GmbH http://www.bfk.de/ Durlacher Allee 47tel: +49-721-96201-1 D-76131 Karlsruhe fax: +49-721-96201-99 ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
[PERFORM] Disk writes
Hi, We've a fedora core 3 box with PostgreSQL 8.0. There is some performance problems with the server and I discovered with vmstat tool that there is some process writing a lot of information in the disk subsystem. I stopped the database and even so vmstat showed the same rates of disk writes. I could I discover who is sending so many data to the disks? Thanks in advance, Reimer
