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MQSeries.net Forum Index » General Discussion » Persistent I/O synchronization method?

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mtravis
PostPosted: Mon Sep 13, 2004 1:39 am    Post subject: Persistent I/O synchronization method? Reply with quote

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Joined: 18 Aug 2004
Posts: 2
Hi. I'm wondering if anybody here offhand knows the mechanism used to synchronize logfile data with physical disk media. I'm particularly interested in Solaris and Linux versions of Websphere MQ 5.3.

fsync() ? fdatasync() ? O_SYNC ? O_DSYNC ?

Anything ring a bell? I suppose I may be able to find out by trussing enough processes and looking for open() and write() calls on log files.

On Solaris at least I'm finding quite drastic difference in performance between the function calls and the open() mechanisms.

Any help would be much appreciated.

Thanks!
Mark
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mtravis
PostPosted: Fri Sep 17, 2004 3:43 pm    Post subject: Reply with quote

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Joined: 18 Aug 2004
Posts: 2
I found the answer.

lsof -f g -- /var/mqm/log

tells me that the .LOG files were opened with flags R,W,DSYN

DSYN corresponds to O_DSYNC I'm sure.

That's on Solaris. I'm sure Linux is similar.
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