#8391: Temporary ugly fix: Change 'top' to 'prstat' on Solaris for 'getusage.py'
------------------------+---------------------------------------------------
Reporter: drkirkby | Owner: drkirkby
Type: defect | Status: new
Priority: major | Milestone:
Component: solaris | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by drkirkby):
Here is the output of an modified version of Sage 4.4.3, where top is not
installed. The modifications were only to get Sage to build at this point.
The hardware is a Sun Blade 1000 with 2 GB RAM.
top() reports that 'top' is not found, and get_memory_usage() goes into an
infinite loop. If you look at the source code, you can see why the
infinite loop exists.
{{{
-bash-3.00$ ./sage
----------------------------------------------------------------------
| Sage Version 4.3.3, Release Date: 2010-02-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: top()
sh: top: not found
''
sage: get_memory_usage()
sh: top: not found
sh: top: not found
sh: top: not found
sh: top: not found
}}}
Here is the output of the same two commands with the changes I will soon
attach.
{{{
drkir...@redstart:~/fresh/sage-4.3.3$ ./sage
----------------------------------------------------------------------
| Sage Version 4.3.3, Release Date: 2010-02-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: top()
'25519 drkirkby 164M 91M sleep 59 0 0:00:07 9.2% python/1'
sage: get_memory_usage()
91.0
}}}
The program 'top' is not installed - instead prstat is used to get the
information. I also expanded the information someone gets when using
help(top) or help(get_usage_message) - see below.
{{{
sage: help(top)
Help on function top in module sage.misc.getusage:
top()
Return the 'top' or 'prstat' line that contains this running
Sage process.
EXAMPLES:
sage: top() # random output
'72373 python 0.0% 0:01.36 1 14+ 1197 39M+ 34M+
55M+ 130M+'
NOTES:
The external command 'top' (http://www.unixtop.org/) is called on
Linux,
and most other operating systems. The output format of 'top' is not
consistent across all platforms and all versions of 'top'. If the
top() function does not work in Sage, you may need to install 'top'.
The external command 'prstat' is called on the Solaris and OpenSolaris
systems. That is part of Solaris, and will not need to be installed.
The
columns used in the 'prstat' output are:
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
sage: help(get_memory_usage)
Help on function get_memory_usage in module sage.misc.getusage:
get_memory_usage(t=None)
Return memory usage.
INPUT:
- ``t`` - None or output of previous call; (only used
on Linux)
OUTPUT:
- ``Linux`` - Returns float number (in megabytes)
- ``OS X`` - Returns float number (in megabytes) that matches VSIZE
column of 'top'
- ``Solaris or OpenSolaris`` - Returns float number (in megabytes)
that matches RSS
column of 'prstat'. Depending on the memory usage, 'prstat' will
output the
data in KB, MB or GB. In each case, the value returned by this
function will
always be in MB.
- ``other`` - not implemented for any other operating systems
EXAMPLES:
We test that memory usage doesn't change instantly::
sage: t = get_memory_usage()
sage: get_memory_usage(t) # amount of memory more than
when we defined t.
0.0
NOTES:
Currently get_memory_usage() calls ''prstat' (Solaris and
OpenSolaris) to get the data it requires. In the long term,
a better solution would be to use Solaris system calls.
In some instances, 'top' may be used on OS X. This may break
if the memory usage is greater than 9999 MB. However, normally
'top' is not used on OS X.
sage:
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8391#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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