12-04-2011
250 - I'm guessing it s a little old 7011-250, in which case 5.1 is the absolute limit, if you can fit it into 64 Meg.
I have an old 7012 with 256MB and it installed 5.1 OK but a bit of light command prompt exercise is about all it can do with that little amount of memory...
HTH.
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ppmd(1) utils ppmd(1)
NAME
ppmd - file-to-file compressor
SYNTAX
ppmd [e|d] [switches] filename...|wildcard...
DESCRIPTION
It is written for embedding in user programs mainly and it is not intended for immediate use. I was interested in speed and performance
improvements of abstract PPM model [1-6] only, without tuning it to particular data types, therefore compressor works good enough for
texts, but it is not so good for nonhomogeneous files (executables) and for noisy analog data (sounds, pictures etc.). Program is very mem-
ory consuming, you can choose balance between execution speed and memory economy, on one hand, and compression performance, on another
hand, with the help of model order selection option (-o).
OPTIONS
-d Delete file[s] after processing, default: disabled.
-s Silent mode.
-fName Set output file name to Name.
-mN Use N MB memory - [1,256], default: 10. The PPMII algorithm might need a lot of memory, especially when used on large files and/or
used with large model order. If ppmd needs more memory than you give it, the compression will be worse. The exact effect is depen-
dent on the -r option.
-oN Set model order to N - [2,16], default: 4. Bigger model orders almost surely results in better compression and surely more memory
and CPU usage.
-r{0,1,2}
Methods of restoration of model correctness at memory insufficiency:
'-r0 - restart model from scratch'. This method is not optimal for any type of data sources, but it works fast and efficient in
average, so it is the recommended method (default).
'-r1 - cut off model'. This method is optimal for quasistationary sources when the period of stationarity is much larger than
period between cutoffs. As a rule, it gives better results, but it is slower than other methods and it is unstable against fragmen-
tation of memory heap at high model orders and low memory.
'-r2 - freeze model'. This method is optimal for stationary sources (show me such source when You will find it ;-)). It is fast
and efficient for such sources.
EXAMPLES
To run this program the standard way type:
ppmd e /tmp/myfile
Alternatively you can run it as:
ppmd -e -o 16 /tmp/myfile
AUTHORS
PPMd was written by Dmitry Shkarin <dmitry.shkarin@mtu-net.ru> and Dmitry Subbotin.
SEE ALSO
gzip(1), bzip2(1), lzma(1).
10.1 2011-07-25 ppmd(1)