OS ASSIGNMENT-1
Q1. In a multiprogramming and time-sharing environment, several users share the system simultaneously. This situation can result in various security problems. a. What are two such problems? b. Can we ensure the same degree of security in a time-shared machine as in a dedicated machine? Explain your answer?
Ans1: (a) Stealing or copying a user 's files; writing over another program 's (belonging to another user or to the OS) area in memory; using system resources (CPU, disk space) without proper accounting; causing the printer to mix output by sending data while some other user 's file is printing.
(b)
Probably we cannot assure the same degree of security in a time shared…show more content…
Batch
b. Interactive
c. Time sharing
d. Real time
e. Network
f. Parallel
g. Distributed
h. Clustered
i. Handheld
Ans5:
a. Batch. Jobs with similar needs are batched together and run through the computer as a group by an operator or automatic job sequencer. Performance is increased by attempting to keep CPU and I/O devices busy at all times through buffering, off-line operation, spooling, and multiprogramming. Batch is good for executing large jobs that need little interaction; it can be submitted and picked up later.
b. Interactive. This system is composed of many short transactions where the results of the next transaction may be unpredictable. Response time needs to be short (seconds) since the user submits and waits for the result.
c. Time sharing. This systems uses CPU scheduling and multiprogramming to provide economical interactive use of a system. The CPU switches rapidly from one user to another. Instead of having a job defined by spooled card images, each program reads its next control card from the terminal, and output is normally printed immediately to the screen.
d. Real time. Often used in a dedicated application, this system reads information from sensors and must respond within a fixed amount of time to ensure correct performance.
e. Network. Provides operating system features across a network such as file sharing.
f. SMP. Used in systems where there are multiple CPU's each running the
Q1. In a multiprogramming and time-sharing environment, several users share the system simultaneously. This situation can result in various security problems. a. What are two such problems? b. Can we ensure the same degree of security in a time-shared machine as in a dedicated machine? Explain your answer?
Ans1: (a) Stealing or copying a user 's files; writing over another program 's (belonging to another user or to the OS) area in memory; using system resources (CPU, disk space) without proper accounting; causing the printer to mix output by sending data while some other user 's file is printing.
(b)
Probably we cannot assure the same degree of security in a time shared…show more content…
Batch
b. Interactive
c. Time sharing
d. Real time
e. Network
f. Parallel
g. Distributed
h. Clustered
i. Handheld
Ans5:
a. Batch. Jobs with similar needs are batched together and run through the computer as a group by an operator or automatic job sequencer. Performance is increased by attempting to keep CPU and I/O devices busy at all times through buffering, off-line operation, spooling, and multiprogramming. Batch is good for executing large jobs that need little interaction; it can be submitted and picked up later.
b. Interactive. This system is composed of many short transactions where the results of the next transaction may be unpredictable. Response time needs to be short (seconds) since the user submits and waits for the result.
c. Time sharing. This systems uses CPU scheduling and multiprogramming to provide economical interactive use of a system. The CPU switches rapidly from one user to another. Instead of having a job defined by spooled card images, each program reads its next control card from the terminal, and output is normally printed immediately to the screen.
d. Real time. Often used in a dedicated application, this system reads information from sensors and must respond within a fixed amount of time to ensure correct performance.
e. Network. Provides operating system features across a network such as file sharing.
f. SMP. Used in systems where there are multiple CPU's each running the
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Latest alpha release (2.12.alpha - 04/29/2021)
Mac Os Mojave
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| Windows64 bits Stereo | NA | |||||
| MacOS 64 bits | NA | |||||
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| Sources | gitrepository: https://github.com/cloudcompare/cloudcompare(for compilation instructions, refer to the BUILD.md file) |
Latest stable release (2.11.3 Anoia)
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| Windows64 bits | (MD5:c43dbac7e2768c7d50b5dd47575a0787) | (MD5:700f38cff87b81f868db8d55e04b446e) | (MD5:b435f71433a06b11b9540c43da912fdb) | |||
| Windows64 bits Stereo(support for NVidia 3D Vision and Oculus Rift) | (MD5:53b385a757468e6cd9db1177a1e0d6a2) | (MD5:724ff39a2c8cb44cad5f53fd508de41d) | (MD5:0188dd248093c853da01a0b6cf5269fd) | |||
| MacOS 64 bits | Thanksto Andy Maloney, MacOS appsare available here | |||||
| Linux64 bits | Nowthanks to AlbertoMardegan (and Romain Janvier), there is a 'universal' snap packagefor Linux. On Ubuntu, starting from version 16.04 it's as simple as typing 'snapinstall cloudcompare'. On other distributions, you may need to install snap first (pleaserefer tothe corresponding documentation if necessary). Snaps are published in 3channels: 'stable', 'beta', and'edge'. The 'stable' andthe'beta'channel deliver the latest stable and beta versions of CloudComparewhile 'edge' delivers nightly builds and may eat your laundry. You canswitch at any time between these three channels by launching 'sudo snaprefresh --' in your terminal. | |||||
| Sources | https://github.com/CloudCompare/CloudCompare/releases/tag/v2.11.1(for compilation instructions, refer to the BUILD.md file) |
Additional resources
- Peter Kovesi provides various perceptually efficient colour ramps: https://peterkovesi.com/projects/colourmaps . Youcan download them (there's a link in the table under the 'Download'section) and load them in CloudCompare once (via the Color Scale Manager - see the 'Export / Import'section). CloudCompare will then remember them.
- The official and up-to-date documentation is always the wiki
- See the 'CHANGELOG.md'file and the latest releasenotes for a list of the latest features
Last version compatible with old intel / ATI graphic cards (2.6.3 beta)
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Notes about the archive versions (7zip):
- we now use 7zipand its 7z format (instead of the more standard zip format) as it ismuch more efficient
- simply decompress the files in their default directory andlaunchthe program with CloudCompare.exeor ccViewer.exe
- try not to decompress files onto a previousversion(delete/uninstall it first)
- you may have to manually install the Microsoft Visual C++Redistributable Package 2017
- the qFaro I/O plugin is not available in the archiveversion (you have to usethe installer)
Assignment 1 Mac Os X
Windows 32 bits
For Windows 32 bits, the last supported versions wereCloudCompare 2.6.2 (installer: and archive: ) andccViewer 1.34 (archive: )
Notes about the archive versions (7zip):
- we now use 7zipand its 7z format (instead of the more standard zip format) as it ismuch more efficient
- simply decompress the files in their default directory andlaunchthe program with CloudCompare.exeor ccViewer.exe
- try not to decompress files onto a previousversion(delete/uninstall it first)
- you may have to manually install the Microsoft Visual C++Redistributable Package 2017
- the qFaro I/O plugin is not available in the archiveversion (you have to usethe installer)
Assignment 1 Mac Os X
Windows 32 bits
For Windows 32 bits, the last supported versions wereCloudCompare 2.6.2 (installer: and archive: ) andccViewer 1.34 (archive: )Plugins
See the list of all plugins: https://www.cloudcompare.org/doc/wiki/index.php?title=Plugins.Sketchup plugin
Assignment 1 Mac Os 11
This plugin will let you'paste' points selected with the 'Point picking list' tool of CloudCompare in Sketchup. It hasbeen developed by P. Biani (see his website).Assignment 1 Mac Os Download
Mind thatthedocumentation of this plugin is only in frenchfor now.