Tests:
[1] time tar -jxf /scratch/linux-2.6.37.tar.bz2
[2] time find linux-2.6.37 -type f -print0 | sort -z | xargs -0 sha1sum >/dev/null # checksum 35187 files, 392.9 MiB total
+ [3] time sh -c 'make defconfig && make -j4'
==============================================================================
NFS in EC2
[1] 65m39.250s
[2] 26m26.267s
+ [3] real 74m11.919s
+ user 10m59.217s
+ sys 1m26.801s
+
+
==============================================================================
Native NFS on c09-45
2011-03-08
[1] 10m18.149s
11m2.714s (re-run)
+ 10m49.994s (re-run)
[2] 0m25.813s
+ [2] 0m48.673s (cache flushed on sever first)
+ [3] real 4m22.533s
+ user 11m2.869s
+ sys 1m33.366s
==============================================================================
Local disk on c09-45
[1] 30.465s (including final sync; decompression: 0m15.865s)
[2] 0m2.453s
+ [2] 0m26.669s (cache flushed before checksums)
==============================================================================
Local disk on c09-45, mount with -o sync
2011-03-08
[1] 5m12.465s
+ [1] 5m4.895s (re-run)
[2] 0m31.590s (remount, then immediately run)
[2] 25m48.819s (data cache flushed, inodes still cached in memory)
- [2] (proxy entirely restarted: no data cached)
+ [2] 4m34.294s (proxy entirely restarted: no data cached)
+ 5m42.449s (re-run)
+ [3] real 5m49.797s (data in cache)
+ user 11m1.725s
+ sys 1m28.970s
+
+ [3] real 7m40.649s (starting with no cached data)
+ user 11m1.213s
+ sys 1m29.586s
+
+
+
+==============================================================================
+BlueSky, US-West, full-segment requests
+2011-03-08
+
+ [1] 4m47.497s
+ [2] 0m31.271s (remount, then immediately run)
+ [2] 2m6.597s (data cache flushed, inodes still cached in memory)
+ [2] 1m54.408s (proxy entirely restarted: no data cached)
+
+==============================================================================
+BlueSky, US-East, range requests
+2011-03-08
+
+ [1] 5m8.481s
+ [2] 0m34.726s (remount, then immediately run)
+ [2] 57m26.399s (data cache flushed, inodes still cached in memory)
+ [2] 13m45.051s (proxy entirely restarted: no data cached)
+ [2] 3m50.423s (as above but with full segment downloads)
+
+ [3] real 10m48.172s (starting with no cached data)
+ user 11m0.173s
+ sys 1m30.670s
+