MemFS v2 û A Memory-based File System on HP-UX 11i v2

The system under test consisted of a HP rx5670 server comprising of 2 x 900MHz Itanium CPUs,
8GB RAM.
Figure 4: Connectathon benchmark results
Hfs VxFS Ramdisk
Default
(sec)
Log
(sec)
Delaylog
(sec)
VxFS
(sec)
MemFS
(sec)
Linux
ext3fs
(sec)
Linux
tmpfs
(sec)
Create
2501.46 699.41 23.48 6.44 4.91 197.51 0.82
Remove
989.77 677.42 8.54 5.38 3.82 26.88 0.91
Lookup across mounts
0.0 0.0 0.0 0.3 0.0 0.0 0.0
Setattr
0.0 6.0 0.1 0.1 0.0 0.0 0.0
Write
0.23 0.54 0.52 0.2 0.3 0.4 0.0
Read
0.1 0.1 0.1 0.1 0.1 0.0 0.0
Readdir
1.24 1.2 0.1 0.1 0.1 0.2 0.1
Link and Rename
3.71 1.8 0.6 0.1 0.0 0.0 0.0
Symlink and Readlink
3.73 2.51 0.1 0.1 0.1 0.0 0.0
Statfs
0.0 0.0 0.0 0.0 0.0 0.22 0.0
The Connectathon basic test results indicate that MemFS performs slightly better than RAMdisk/VxFS,
and far better than disk based filesystems, but not as good as Linux tmpfs.
SDET Benchmark
The Software Development Environment Throughput (SDET) benchmark is a highly scalable, multi-
process benchmark which exercises most of the kernel (except networking). The benchmark was
designed to apply a representative model workload to a system at increasing levels of concurrency in
order to generate a graph of throughput vs. offered load. SDET, is however, a system benchmark,
and therefore may not give an accurate picture of filesystem performance only.
The system under test consisted of a HP rx5670 server comprising of 2 x 900MHz Itanium CPUs,
8GB RAM. The same test system was installed with Red Hat Linux 2.4.21-4 and the SDET benchmark
was run on tmpfs and ext2fs.