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OS/2 Help File
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1996-04-13
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8KB
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259 lines
ΓòÉΓòÉΓòÉ 1. About ZipStream Control Panel ΓòÉΓòÉΓòÉ
ZipStream Control Panel
Version 1.20
Copyright (c) Carbon Based Software 1993, 1996
All Rights Reserved
Allows the user to configure ZipStream's background compression system.
ΓòÉΓòÉΓòÉ 2. Defaults ΓòÉΓòÉΓòÉ
The Defaults push button resets all options to their default value.
ΓòÉΓòÉΓòÉ 3. Compression Options ΓòÉΓòÉΓòÉ
Compression options allow you to configure ZipStream's compression system.
ΓòÉΓòÉΓòÉ 3.1. Compress New ΓòÉΓòÉΓòÉ
If checked, ZipStream will compress newly created files.
Having this option not checked is most useful when you wish to manually
compress files with ZSPack to establish your compressed environment and you do
not want any further automatic compression to take place. e.g. You have a Word
Processing program that you compressed with ZSPack, but you do not want any new
files created by the Word Processor to be compressed.
ΓòÉΓòÉΓòÉ 3.2. ReCompress ΓòÉΓòÉΓòÉ
If checked, ZipStream will recompress compressed files that have been updated.
Leaving this option unchecked will cause compressed files that are updated to
be returned to the uncompressed state.
ΓòÉΓòÉΓòÉ 3.3. Compress ReadOnly ΓòÉΓòÉΓòÉ
If checked, ZipStream will compress Read-Only Files.
ΓòÉΓòÉΓòÉ 3.4. Rename Track ΓòÉΓòÉΓòÉ
If checked, ZipStream will track rename operations so that new or updated files
are compressed.
Normally, most Word Processors and similar programs update a file by writing to
a temporary file and then renaming it to the actual file name. ZipStream will,
if this option is checked, track these operations to ensure that new or
modified files that are renamed are automatically compressed.
ΓòÉΓòÉΓòÉ 3.5. Compress Always ΓòÉΓòÉΓòÉ
If checked, ZipStream will compress a file even if no gain is made by the
compression operation.
ΓòÉΓòÉΓòÉ 3.6. DOS Compatible ΓòÉΓòÉΓòÉ
If checked, ZipStream will compress a file using an algorithm that will allow
the file to be decompressed again under DOS in a future version of ZipStream.
Using this mode may reduce the performance and compression efficiency.
The option is currently disabled while design improvements are being
researched.
ΓòÉΓòÉΓòÉ 3.7. High Priority ΓòÉΓòÉΓòÉ
If checked, ZipStream's background compression will operate at a higher
priority. Using this mode may reduce the overall performance of your system,
but will ensure that files are compressed quickly.
By default the background compression system will operate at low or background
priority and will have very little effect on overall system performance.
However, in some situations this may lead to a large number of outstanding
compression operations being queued.
ΓòÉΓòÉΓòÉ 3.8. Warp Factor ΓòÉΓòÉΓòÉ
The Warp Factor is a combination Compression Effort, Compression Algorithm and
Caching method selection.
Currently Warp values of '2', '3', '4', '5', '6' and '7' may be applied.
Warp 2
Warp 2 has the following effects:
1. Use sparse virtualisation.
2. Does not use Grip cache.
3. Asynchronous recompression if modified.
4. Use default compression effort.
5. Use best compression method.
6. Use auto algorithm selection.
Warp 3
Warp 3 has the following effects:
1. Use sparse virtualisation.
2. Files *.exe and *.dll placed in Grip cache for default Grip period.
3. Asynchronous recompression if modified.
4. Use default compression effort.
5. Use best compression method.
6. Use auto algorithm selection.
Warp 4
Warp 4 has the following effects:
1. Use sparse virtualisation.
2. Place in Grip cache for default period.
3. Asynchronous recompression if modified.
4. Use default compression effort.
5. Use best compression method.
6. Use auto algorithm selection.
Warp 5
Warp 5 has the following effects:
1. File fully virtualised on open.
2. Does not use Grip cache.
3. Asynchronous recompression if modified.
4. Use default compression effort.
5. Use best compression method.
6. Use auto algorithm selection.
Warp 6
Warp 6 has the following effects:
1. File fully virtualised on open.
2. Files *.exe and *.dll placed in Grip cache for default Grip period.
3. Asynchronous recompression if modified.
4. Use default compression effort.
5. Use best compression method.
6. Use auto algorithm selection.
Warp 7
Warp 7 has the following effects:
1. File fully virtualised on open.
2. Place in Grip cache for default period.
3. Asynchronous recompression if modified.
4. Use default compression effort.
5. Use best compression method.
6. Use auto algorithm selection.
The higher the warp value selected, generally will result in higher performance
when accessing compressed files. This will also cause larger Swapper file
space requirements.
The default value of Warp 3 will is recommended in most cases.
Warp 2 is recommended for infrequently accessed files or for machines with low
amounts of RAM.
Warp 4, 6, or 7 is recommended for games etc where access to compressed data
must occur at the fastest possible rate.
A Warp setting above 4 requires much more system resources for operation and
therefore should only be selected when needed as performance may actually
decrease in constrained or very active environments.
ΓòÉΓòÉΓòÉ 3.9. Effort ΓòÉΓòÉΓòÉ
The Effort setting allows you to trade compression for speed.
The minimum value of 1 favors speed over compression, while the maximum value
of 9 favors compression over speed. The default value of 3 has been selected to
provide the best balance of speed and compression with a slight favoring
towards speed due to the 'on the fly' nature of ZipStream's operation.
ΓòÉΓòÉΓòÉ 4. Performance Options ΓòÉΓòÉΓòÉ
Performance options allow you to configure ZipStream's options for performance.
They should not be altered without a detailed understanding of ZipStream's
operation.
ΓòÉΓòÉΓòÉ 4.1. Search Cache ΓòÉΓòÉΓòÉ
The Search Cache value is the number of Directory entries ZipStream will store
in persistent memory measured in thousands. More Search Cache normally means
faster operation. The default value of 8 (8192) entries is optimal for the
average system, however, if you have a very large number of files on a
compressed drive you may want to increase this value.
The minimum value is 4 (4096) and the maximum value is 64 (65536). Having a
very large number of Search Cache entries will have the side effect of slowing
system booting.
A reboot is required for this option change to take effect.
ΓòÉΓòÉΓòÉ 4.2. Grip Cache ΓòÉΓòÉΓòÉ
The Grip Cache is a secondary Virtual File Cache that ZipStream uses to
optimise performance.
The size selection is given in MBytes.
Basically, a compressed file that has the Grip cache option will be retained in
the Virtual File Cache memory as uncompressed data for a period of time after
its last access.
The benefit of this is that any subsequent accesses within the Grip time
period, will avoid the decompression delay.
The value selected is only a hint to ZipStream as ZipStream will internally
adjust this value depending on the system configuration.
Currently the default Grip period is 1 (one) minute.
A reboot is required for this option change to take effect.