Editing Compressibility evaluation
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== Evaluation == | == Evaluation == | ||
| − | When a file completes, 3 180Kb blocks [thanks SF],(eMule's block size) are tested from the ¼ ½ ¾ points in the file. If the sum of the compressed size of these blocks equals or exceeds the uncompressed size then 10 more 180Kb blocks are tested from the middle half of the file. If the sum of all of these blocks meets or exceeds the uncompressed size then compression is turned off for that file. If the original test or the second test results in a reduction of less than 3% fast compression is used. Otherwise normal full compression is used. For incomplete files the original list is used with the addition of 7z,gz and lzh. The list is also moved to the partfile constructor where it sets a flag so it is evaluated once, saving CPU cycles. | + | When a file completes, 3 180Kb blocks [thanks SF],(eMule's block size) are tested from the ¼ ½ ¾ points in the file. If the sum of the compressed size of these blocks equals or exceeds the uncompressed size then 10 more 180Kb blocks are tested from the middle half of the file. If the sum of all of these blocks meets or exceeds the uncompressed size then compression is turned off for that file. If the original test or the second test results in a reduction of less than 3% fast compression is used. Otherwise normal full compression is used. For incomplete files the original list is used with the addition of 7z,gz and lzh. The list is also moved to the partfile constructor where it sets a flag so it is evaluated once, saving CPU cycles. Note: From version 1.3e If the SCE code is unable to evaluate a file due to file read errors etc, on three separate occasions it's compressibility will be set as per partfiles to prevent continuous rehashing of a problem file on startup. Important note: As evaluation occurs on completion, after hashing, on first run this code will rehash and evaluate all completed files. This will reset stats for these files. |
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| − | Note: From version 1.3e If the SCE code is unable to evaluate a file due to file read errors etc, on three separate occasions it's compressibility will be set as per partfiles to prevent continuous rehashing of a problem file on startup. Important note: As evaluation occurs on completion, after hashing, on first run this code will rehash and evaluate all completed files. This will reset stats for these files. | + | |
from tk4 mod: [tk4 (http://emuletk4mod.sourceforge.net/TK4_Mod_Readme.htm#SCE)] | from tk4 mod: [tk4 (http://emuletk4mod.sourceforge.net/TK4_Mod_Readme.htm#SCE)] | ||
[[category:features]] | [[category:features]] | ||
