My application processes thousands of files sequentially, reading input files, and outputting new files. I am using Solaris 10U4. While running the application in a verbose mode, I see that it runs very fast but pauses about every 7 seconds for a second or two. This is while reading 50MB/second and writing 73MB/second (ARC cache miss rate of 87%). The pause does not occur if the application spends more time doing real work. However, it would be nice if the pause went away.
I have tried turning down the ARC size (from 14GB to 10GB) but the behavior did not noticeably improve. The storage device is trained to ignore cache flush requests. According to the Evil Tuning Guide, the pause I am seeing is due to a cache flush after the uberblock updates. It does not seem like a wise choice to disable ZFS cache flushing entirely. Is there a better way other than adding a small delay into my application? Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
