On Tue, Aug 20, 2013 at 04:02:42PM +0200, Heinz Diehl wrote:
> On 20.08.2013, Heinz Diehl wrote:
>
> > Then, open another one and run fsync-tester. The numbers that count to
> > compare different elevators on your system is the output fsync-tester
> > generates while your machine is generating the "bigfile".
>
> And while your're at it, you could also consider doing some
> fsmark runs (without the load), e.g.:
>
> ./fs_mark -S 1 -D 10000 -N 100000 -d /home/htd/fsmark/test -s 65536 -t4 -w 4096 -F
>
> Notice the -t switch, which lets you specify the number of
> threads used.
Here they are:
CFQ:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/mihai/tmp/c/fs_mark-3.3 -s 65536 -t4 -w 4096 -F
# Version 3.3, 4 thread(s) starting at Tue Aug 20 23:30:40 2013
# Sync method: INBAND FSYNC: fsync() per file in write loop.
# Directories: Round Robin between directories across 10000
# subdirectories with 100000 files per subdirectory.
# File names: 40 bytes long, (16 initial bytes of time stamp
# with 24 random bytes at end of name)
# Files info: size 65536 bytes, written with an IO size of
# 4096 bytes per write
# App overhead is time in microseconds spent in the test not
# doing file writing related system calls.
#
FSUse% Count Size Files/sec App Overhead
77 4000 65536 50.4 88160
77 8000 65536 43.2 104150
77 12000 65536 44.4 94512
Deadline:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/mihai/tmp/c/fs_mark-3.3/test -s 65536 -t4 -w 4096 -F
# Version 3.3, 4 thread(s) starting at Tue Aug 20 23:42:19 2013
# Sync method: INBAND FSYNC: fsync() per file in write loop.
# Directories: Round Robin between directories across 10000
# subdirectories with 100000 files per subdirectory.
# File names: 40 bytes long, (16 initial bytes of time stamp
# with 24 random bytes at end of name)
# Files info: size 65536 bytes, written with an IO size of
# 4096 bytes per write
# App overhead is time in microseconds spent in the test not
# doing file writing related system calls.
#
FSUse% Count Size Files/sec App Overhead
77 4000 65536 47.6 92902
77 8000 65536 41.6 101888
77 12000 65536 39.6 97937
Noop:
# ./fs_mark -S 1 -D 10000 -N 100000 -d /home/mihai/tmp/c/fs_mark-3.3/test -s 65536 -t4 -w 4096 -F
# Version 3.3, 4 thread(s) starting at Tue Aug 20 23:48:10 2013
# Sync method: INBAND FSYNC: fsync() per file in write loop.
# Directories: Round Robin between directories across 10000
# subdirectories with 100000 files per subdirectory.
# File names: 40 bytes long, (16 initial bytes of time stamp
# with 24 random bytes at end of name)
# Files info: size 65536 bytes, written with an IO size of
# 4096 bytes per write
# App overhead is time in microseconds spent in the test not
# doing file writing related system calls.
#
FSUse% Count Size Files/sec App Overhead
77 4000 65536 46.8 89478
77 8000 65536 42.0 101337
77 12000 65536 43.2 95834
It does not look like significant differences between schedulers.
Mihai
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