Neil Brown wrote:
On Thursday August 17, [email protected] wrote:
Can you report the contents of /proc/meminfo before, during, and after
the long pause?
I'm particularly interested in MemTotal, Dirty, and Writeback, but the
others are of interest too.
Thanks,
NeilBrown
I've prepared two logs, from different machines, the first one is on
software RAID5 (4 ATA disks) with deadline scheduler, the second on a
single ATA disk with CFQ scheduler. In the first case 10 writer threads
are sufficient to give large delays, in the second case I've run an
additional tar thread reading from the disk.
The logs are here:
http://galaxy.agh.edu.pl/~szymans/logs/
Each writer starts with:
Writing 200 MB to stdout without fsync
than reports each write() that lasts > 3s along with pid:
6582 - Delayed 4806 ms.
And finishes with:
Max write delay: 14968 ms.
Andrzej.
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