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However, with ext3 filesystem on the same system, the `sudo sync` is negligible. | However, with the ext3 filesystem on the same system, the `sudo sync` is negligible. |
Benchmarks of COW directory copies and removal in [:cowbuilder: cowbuilder].
Details
The numbers in the copy column were generated using:
time sudo cp -al /var/cache/pbuilder/base.cow /tmp/new
and in the remove column:
time sudo rm -rf /tmp/new
Everything is in seconds. XFS filesystems:
computer |
copy |
remove |
computer details |
pc232 |
16.1 |
18.2 |
Intel Core 2 Duo, ST3250820AS /dev/sda1 (10GB, xfs, 80% full), sid, i386 |
pc232 |
9.0 |
10.0 |
Intel Core 2 Duo, ST3250820AS /dev/sda2 (10GB, xfs, 2.4% full), sid, i386 |
august |
9.3 |
10.9 |
Intel Core 2 Quad, ST3320620AS /dev/sda1 (20GB, xfs, 20% full), sid, i386 |
august |
5.8 |
9.5 |
Intel Core 2 Quad, ST3320620AS /dev/sda3 (233GB, xfs, 0.2% full), sid, i386 |
dakol |
0.48 |
0.5 |
AMD Athlon 64 3800+, ST3160827AS /dev/sda7 (135GB, xfs, 32% full), sid, amd64 |
fuji |
13.9 |
16.4 |
Intel Core Duo, WDC WD1600BEVS-2 /dev/sda1 (14GB, xfs, 33% full), sid, i386 |
Ext3 filesystems:
computer |
copy |
remove |
computer details |
pc232 |
0.2 |
0.14 |
Intel Core 2 Duo, ST3250820AS /dev/sda2 (10GB, ext3, 2.4% full), sid, i386 |
august |
0.22 |
0.13 |
Intel Core 2 Quad, ST3320620AS /dev/sda5 (42GB, ext3, 0.9% full), sid, i386 |
dakol |
0.22 |
0.15 |
AMD Athlon 64 3800+, ST3160827AS /dev/sda5 (2GB, ext3, 14.5% full), sid, amd64 |
Note 1: All copies were done on the same partition, the number of which is noted in the computer details column.
Note 2: XFS filesystem was created using mkfs.xfs, ext3 filesystem was created with mkfs.ext3. No options added.
Note 3: On dakol with XFS filesystem, cp takes 0.5s, sudo sync takes 3s (!), rm takes 0.5s, and another sudo sync takes 2.8s. However, with the ext3 filesystem on the same system, the sudo sync is negligible.
Conclusion
The ext3 filesystem is truly superior to XFS for the cowbuilder purpose. Just use it and you'll be fine.