From: Hegarty, John (John.Hegarty@pearson.com)
Date: Tue Apr 29 2003 - 15:25:28 EDT
Hi managers,
We've just upgraded from an alpha running 4.0F to an EV45 running 5.1B with
the latest patch kit installed. The applications we run mmap a 400M file
which they use for shared data structures. This mmap file is locked into
memory with the mlockall routine. Now that we are running 5.1B we are having
serious performance issues when under load and what I suspect is happening
is that the system is writing the file back to disk approximately every 30
seconds. Under 4.0F that was apparently done when the last program detached
the mmap as near as we can determine. We have tried setting
AdvfsSyncMmapPages = 0 and new_wire_method = 0 and neither has helped the
situation, the system still puts all the programs into an uninterruptible
sleep and we see large amounts of disk activity on the volume containing the
mmap file every half minute or so. We also tried moving the mmap file to a
UFS volume which helped somewhat but the performance is still not at all
comparable to what it was under 4.0F. Any suggestions?
Thanks in advance,
John Hegarty
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