/[clonezilla-sysresccd]/trunk/www/working/clonezilla.html
ViewVC logotype

Diff of /trunk/www/working/clonezilla.html

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 65 by jyrki, Fri May 28 12:39:48 2010 UTC revision 66 by jyrki, Sat May 29 17:43:55 2010 UTC
# Line 232  Fianlly I should say that <b>Clonezilla Line 232  Fianlly I should say that <b>Clonezilla
232  <!--empty line-->  <!--empty line-->
233  <H4><a name="compression-method"></a>Compression method [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4>  <H4><a name="compression-method"></a>Compression method [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4>
234  <!--empty line-->  <!--empty line-->
235  <p class="newcode"><a name="z_option"></a><font color="Red">-z1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gzip compression (fast with a smaller image)<br>  <p class="newcode"><a name="z_option"></a><font color="Red">-z1p&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use parallel gzip compression (testing), for multicore/CPU<br>
236    -z1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;gzip compression (fast with a smaller image)<br>
237    -z2p&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use parallel bzip2 compression (testing), for multicore/CPU<br>
238  -z2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bzip2 compression (slowest but smallest image)<br>  -z2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bzip2 compression (slowest but smallest image)<br>
239  -z3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lzo compression (faster with image size approx. to that of gzip)(NOTE!!)<br>  -z3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lzo compression (faster with image size approx. to that of gzip)(NOTE!!)<br>
240  -z4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lzma compression (slowest but also small image, faster decompression than bzip2)<br>  -z4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lzma_compression_(slowest_but_also_small_image,_faster_decompression_than_bzip2)<br>
241    -z5p&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use_parallel_xz_compression_(testing),_for_multicore/CPU<br>
242    -z5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;xz_compression_(slowest_but_also_small_image,_faster_decompression_than_bzip2)<br>
243    -z6p&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Use_parallel_lzip_compression_(testing),_for_multicore/CPU<br>
244    -z6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lzip_compression_(slowest_but_also_small_image,_faster_decompression_than_bzip2)<br>
245  -z0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No compression (fastest but largest image size)</font></p>  -z0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No compression (fastest but largest image size)</font></p>
246  <!--empty-line-->  <!--empty-line-->
247  <p>This option chooses the method which is used to compress the image while creating it.</p>  <p>This option chooses the method which is used to compress the image while creating it.</p>
# Line 244  Fianlly I should say that <b>Clonezilla Line 250  Fianlly I should say that <b>Clonezilla
250    
251  <p><b>Gzip</b> and <b>lzop</b> are fast compression methods. <b>Lzop</b> is many times faster than <b>gzip</b>, but creates slightly larger images. <b>Clonezilla Live</b> warns that <b>lzop</b> requires good-quality RAM, but I (the contributor who wrote this chapter) think other compression methods require good RAM too.</p>  <p><b>Gzip</b> and <b>lzop</b> are fast compression methods. <b>Lzop</b> is many times faster than <b>gzip</b>, but creates slightly larger images. <b>Clonezilla Live</b> warns that <b>lzop</b> requires good-quality RAM, but I (the contributor who wrote this chapter) think other compression methods require good RAM too.</p>
252    
253  <p><b>Bzip2</b> and <b>lzma</b> are powerful compression methods. <b>Lzma</b> creates a little smaller images than <b>bzip2</b>, and decompressing lzma-compressed images is faster than decompressing <b>bzip2</b> images. But there is no free lunch: <b>lzma</b> compression method is very slow compared even to <b>bzip2</b>, which isn't fast method either.</p>  <p><b>Bzip2</b>, <b>lzma</b>, <b>xz</b> and <b>lzip</b> are powerful compression methods. <b>Lzma</b> creates a little smaller images than <b>bzip2</b>, and decompressing lzma-compressed images is faster than decompressing <b>bzip2</b> images. But there is no free lunch: <b>lzma</b> compression method is very slow compared even to <b>bzip2</b>, which isn't fast method either.</p>
254    
255    <p><b>Lzma</b> method is becoming obsolete, and both <b>xz</b> and <b>lzip</b> are attempting to become its successor. They are a bit less powerful compression methods than <b>lzma</b>, but much faster. The differences between <b>xz</b> and <b>lzip</b> are virtually non-existent.</p>
256    
257    <p>If you don't use the i486 version of <b>Clonezilla-SysRescCD</b>, parallel <b>gzip</b>, <b>bzip2</b>, <b>xz</b> and <b>lzip</b> compression methods are also available. Parallel compression means that each processor core compresses a different part of the image at a time. Without parallel compression one core compresses everything.</p>
258    
259    <p>The speed impact caused by parallel compression depends on the number of processor cores available. In addition, Hyper-Threading increases the speed by about 30 %. For example, if your processor contains four cores and supports Hyper-Threading, speed with parallel compression is nearly 5,2 times as high as without. However, parallel compression is currently an experimental feature - and it just decreases speed if the processor contains only one core and doesn't support Hyper-Threading.</p>
260    
261    <p>If you don't know if parallel compression increases or decreases the speed on your computer, try it anyway. The negative speed impact it may cause isn't big.</p>
262  <!--empty line-->  <!--empty line-->
263  <H4><a name="splitting"></a>Splitting [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4>  <H4><a name="splitting"></a>Splitting [<a href="#clonezilla-top" title="go to top of the page">^</a>]</H4>
264  <!--empty line-->  <!--empty line-->

Legend:
Removed from v.65  
changed lines
  Added in v.66

webmaster@linux.gr
ViewVC Help
Powered by ViewVC 1.1.26