Disk writes much slower in Bookworm i386 [Was: svnadmin dump ...]
I have done additional research, and it now appears that programs that do extensive disk writes run much slower (3-6x) in Bookworm than they did in Bullseye. The two cases I have observed are 'svnadmin dump', and extracting an SQL backup of a Bacula database from Postgresql (backup file about 3 GB). Operations that perform extensive reads (a Bacula backup operation to magnetic tape, 600 GB) seem to run at the same speed as before.
At the moment, this is a 32-bit PAE system. I don't know of an obvious reason why that would matter. At the time of the upgrade, the system memory was enlarged from 16 to 32GB, in anticipation of converting the system from i386 to amd64.
Suggestions for tracking this down would be welcome.
Ken
Sent: Thursday, August 10, 2023 12:04 PM
To: 'debian-user@lists.debian.org'
Subject: svnadmin dump much slower in Bookworm
A set of svnadmin dump commands that run as part of a backup procedure seem to be _much_ slower in Bookworm than in Bullseye. Prior to the upgrade to Bullseye, these commands took slightly less than one hour. After the upgrade, similar commands (dumping a few more revisions) require more than six hours. The script that performs these commands has not been changed. Has anyone else seen this problem?
Thanks,
Ken
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