phcomp -- compare files with timer, bypassing operating system cache
--- open source freeware ---
[page last modified 2015-02-11]
phcomp is a command line program that reads a file in large chunks, displaying a timer as the operation proceeds. It is intended to be used with large files to measure the performance of a storage device (eg. a Blu-ray drive).
A second file can be specified to invoke file compare mode; in this case, both files are read and their contents compared up to the size of the smaller file. If a difference is encountered the comparison stops.
File access avoids using/altering the operating system cache -- thus the timing reflects the performance of the underlying device. Also the compare insures what is on the media is truly compared; important, for instance, if working with a questionable/counterfeit flash device.
The Win32 C source is provided; it is freeware, there are no restrictions on
its use, but no guarantee is given. The source has been compiled and tested
with Microsoft Visual C compilers versions 6, 7.1, 9, 10 and 12.
Compares files w/timer. Ver 2.0, 2/11/2015 PaulHoule.com
If second file omitted, first file is read and discarded.
Bypasses operating system cache to produce consistent timings
and a true test of the underlying storage medium.
Usage: phcomp {-opt(s)} file1 {file2|path}
-? This display
-d# Display # chars of file name
-b# Read buffer size (4k min, default 4 meg)
-o# Start file offset
-m# Max file offset (-m for smallest filesize)
Change Log
version 2.0 released 2/11/2015: Shrunk .exe to 4k by removing C stdlib.
Click here to download phcomp20.zip
version 1.9 released 1/20/2015: Allowed -m option to be empty to indicate smallest file size. Fixed bug not returning 0 exitcode on match.
Click here to download phcomp19.zip
version 1.7 released 1/6/2015: Added -d option, fixed -o bug. Allowed 2nd filespec to be a path.
Click here to download phcomp17.zip
version 1.6 released 11/23/2014: Increased default read buffer size, added -o and -m options.
Click here to download phcomp16.zip
version 1.4 released 6/20/2014: Initial Win32 version.
Click here to download phcomp14.zip
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