"Fossies" - the Fresh Open Source Software Archive
Member "stress-1.0.5/doc/stress.txt" (2 Oct 2021, 3156 Bytes) of package /linux/privat/old/stress-1.0.5.tar.gz:
As a special service "Fossies" has tried to format the requested text file into HTML format (style: standard
) with prefixed line numbers.
Alternatively you can here view
the uninterpreted source code file.
2 stress - tool to impose load on and stress test a computer system
5 stress [OPTIONS]
8 stress is a tool that imposes a configurable amount of CPU, memory, I/O,
9 or disk stress on a POSIX-compliant operating system and reports any errors
10 it detects.
12 stress is not a benchmark. It is a tool used by system administrators to
13 evaluate how well their systems will scale, by kernel programmers to evaluate
14 perceived performance characteristics, and by systems programmers to expose
15 the classes of bugs which only or more frequently manifest themselves when
16 the system is under heavy load.
19 -?, --help Show this help statement.
20 --version Show version statement.
21 -v, --verbose Be verbose.
22 -q, --quiet Be quiet.
23 -n, --dry-run Show what would have been done.
24 -t, --timeout <N> Timeout after N seconds. This option is ignored by -n.
25 --backoff <N> Wait for factor of microseconds before starting work.
26 -c, --cpu <N> Spawn N workers spinning on sqrt().
27 -i, --io <N> Spawn N workers spinning on sync().
28 -m, --vm <N> Spawn N workers spinning on malloc()/free().
29 --vm-bytes <B> Malloc B bytes per vm worker (default is 256MB).
30 --vm-stride <B> Touch a byte every B bytes (default is 4096).
31 --vm-hang <N> Sleep N secs before free (default none, 0 is inf).
32 --vm-keep Redirty memory instead of freeing and reallocating.
33 -d, --hdd <N> Spawn N workers spinning on write()/unlink().
34 --hdd-bytes <B> Write B bytes per hdd worker (default is 1GB). The file
35 will be created with mkstemp() in the current directory.
37 Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).
40 The simple case is that you just want to bring the system load average up to an
41 arbitrary value. The following forks 13 processes, each of which spins in a
42 tight loop calculating the sqrt() of a random number acquired with rand().
44 stress -c 13
46 Long options are supported, as well as is making the output less verbose. The
47 following forks 1024 processes, and only reports error messages if any.
49 stress --quiet --cpu 1k
51 To see how your system performs when it is I/O bound, use the -i switch. The
52 following forks 4 processes, each of which spins in a tight loop calling
53 sync(), which is a system call that flushes memory buffers to disk.
55 stress -i 4
57 Multiple hogs may be combined on the same command line. The following does
58 everything the preceding examples did in one command, but also turns up the
59 verbosity level as well as showing how to cause the command to self-terminate
60 after 1 minute.
62 stress -c 13 -i 4 --verbose --timeout 1m
64 You can write a file of arbitrary length to disk. The file is created with
65 mkstemp() in the current directory.
67 stress -d 1 --hdd-bytes 13
69 Large file support is enabled.
71 stress -d 1 --hdd-bytes 3G
74 stress was originally developed by Amos Waterland <firstname.lastname@example.org> and
75 is maintained by some volunteers.
77 Currently, source code and newer versions are available at