Win32::SystemInfo - Memory and Processor information on Win32 systems
use Win32::SystemInfo;
# Get Memory Information
my %mHash;
if (Win32::SystemInfo::MemoryStatus(%mHash))
{
...process results...
}
To get specific values:
my %mHash = (TotalPhys => 0, AvailPhys => 0);
if (Win32::SystemInfo::MemoryStatus(%mHash))
{
...mHash contains only TotalPhys and AvailPhys values...
}
Change the default return value:
Win32::SystemInfo::MemoryStatus(%mHash,"MB");
# Get Processor Information
my $proc = Win32::SystemInfo::ProcessorInfo();
if ($proc >= 586) { ... }
my %phash;
Win32::SystemInfo::ProcessorInfo(%phash);
for (my $i = 0; $i < $phash{NumProcessors}; $i++) {
print "Speed of processor $i: " . $phash{"Processor$i"}{MHZ} . "MHz\n";
}
With this module you can get total/free memory on Win32 systems, including installed RAM (physical memory) and page file. This module will also let you access processor information, including processor family (386,486,etc), speed, name, vendor, and revision information.
Module provides two functions:
%mHash - The hash that will receive the results.
Certain values can be set prior to the
call to retrieve a subset. (See below)
$format - Optional parameter. Used to set the order
of magnitude of the results. (See below)
Determines the current memory status of a Win32 machine. Populates %mHash with the results. Function returns undef on failure.
Values returned through the hash:
MemLoad - Windows NT 3.1 to 4.0: The percentage of
approximately the last 1000 pages of physical
memory that is in use.
- Windows 2000: The approximate percentage of
total physical memory that is in use.
TotalPhys - Total amount of physical memory (RAM).
AvailPhys - Available physical memory (RAM).
TotalPage - Allocated size of page (swap) file.
AvailPage - Available page file memory.
TotalVirtual - Total physical + maximum page file.
AvailVirtual - Total amount of available memory.
Values returned through the hash can also be specified by setting
them before the function is called.
my %mHash = (TotalPhys => 0);
Win32::MemoryInfo::MemoryStatus(%mHash);
Will return only the total physical memory.
MemoryStatus return values in bytes by default. This can be changed with
the $format parameter. Valid values for $format are:
B - Bytes (default)
KB - Kilobytes
MB - Megabytes
GB - Gigabytes
Determines the processor information of a Win32 computer. Returns a "quick" value or undef on failure. Can also populate %pHash with detailed information on all processors present in the system.
$proc - Contains a numerical representation of the
- processor level for Intel machines. For
- example, a Pentium will return 586.
- For non-Intel Windows NT systems, the
- possible return values are:
- PPC: PowerPC
- MIPS: MIPS architecture
- ALPHA: Alpha architecture
- UNKNOWN: Unknown architecture
%pHash - Optional parameter. Will be filled with
- information about all processors.
Values returned through hash: NumProcessors - The number of processors installed ProcessorN - A hash containing all info for processor N
Each ProcessorN hash contains the values:
Identifier - The identifier string for the processor
- as found in the registry. The computer I'm
- currently using returns the string
- "x86 Family 6 Model 7 Stepping 3"
VendorIdentifier - The vendor name of the processor
MHZ - The speed in MHz of the processor
- Returns -1 if unable to determine.
ProcessorName - The name of the processor, such as
- "Intel Pentium", or "AMD Athlon".
PLEASE read the note about the MHz value in Caveats, below.
No functions are exported.
Installation is simple. Follow these steps:
perl makefile.pl nmake nmake test nmake install
Copy the SystemInfo.html file into whatever directory you keep your documentation in. I haven't figured out yet how to automatically copy it over, sorry.
I've noticed that ActiveState can give an error about not being
able to find perl when processing the makefile.pl file on Win9x.
To get around this, open makefile.pl and add another key/value
pair into WriteMakefile() that looks like this:
'PERL' => 'full/path/to/your/perl.exe',
That should do the trick!
This module can also be used by simply placing it and the included DLL in your /Win32 directory somewhere in @INC.
This module requires
Win32::API module by Aldo Calpini
Win32::TieRegistry Module by Tye McQueen
The information returned by the MemoryStatus function is volatile. There is no guarantee that two sequential calls to this function will return the same information.
On computers with more than 4 GB of memory, the MemoryStatus function can return incorrect information. Windows 2000 reports a value of -1 to indicate an overflow. Earlier versions of Windows NT report a value that is the real amount of memory, modulo 4 GB.
On Intel x86 computers with more than 2 GB and less than 4 GB of memory, the MemoryStatus function will always return 2 GB for TotalPhys. Similarly, if the total available memory is between 2 and 4 GB, AvailPhys will be rounded down to 2 GB.
ProcessorInfo will only reliably return CPU speed for Intel chips, and AMD chips that support the time stamp counter. (This appears to be K6-2, K6-III, all Athlons, and Duron.) The return value for MHz should always be checked in a Win9x environment to verify that it is valid. (Invalid processors, or other errors will return a -1.)
The ProcessorName value returned by ProcessorInfo may sometimes reference more than one processor. For example, the returned value may be ``Intel Pentium or Pentium Overdrive''. There are ways to tell these processors apart programmatically, but I did not take the time to implement the extra code in this release.
The ProcessorInfo function has been only tested in these environments:
Windows 98, Single Pentium II processor
Windows NT 4.0, Single Pentium III processor
Windows XP Pro, Single Athlon processor
All feedback on other configurations is greatly welcomed.
This module has been created and tested on Windows 98 and WinNT 4.0 on ActiveState port of Perl 5.6. It has not been extensively tested on Windows 2000 yet.
0.01 - Initial Release
0.02 - Fixed CPU speed reporting for Win9x. Module now includes a DLL that
performs the Win9x CPU speed determination.
0.03 - Fixed warning "use of uninitialized value" when calling MemoryStatus
with no size argument.
0.04 - Fixed "GetValue" error when calling ProcessorInfo as non-admin user
on WindowsNT
- Fixed documentation bug: "AvailableVirtual" to "AvailVirtual"
0.05 - Fixed bug introduced in 0.03 where $format was ignored in
MemoryStatus. All results were returned in bytes regardless of
$format parameter.
0.06 - Added new entry to processor information hash to display the name
of the processor. WindowsNT and 2K now use the DLL to determine
CPU speed as well.
0.07 - Changed contact information. Recompiled DLL to remove some extraneous calls.
=head1 BUGS
Please report.
This man page documents Win32::SystemInfo version 0.07
April 29, 2002.
Chad Johnston <cjohnston@megatome.com>
Copyright (C) 2002 by Chad Johnston. All rights reserved.
This package is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl(1).
Win32 Win32/Utilities