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Greg Burri, 07/30/2009 04:29 PM
Structures¶
Files cache¶
This file contains all the shared files and theirs SHA-1 hashes. This file is saved in user space after an update of the file list, it is completely loaded at the start of Aybabtu. If some paths of some files doesn't match the shared directory they are discarded.
You can see the proto file here : source:/protos/files_cache.proto
Size¶
Here is a size approximation for 50'000 files stored in 1 TB. The overhead of the file format is not taken in account.
Nb of files : 50'0000 Total size : 1 TB Chunk Size : 32 MB Average file per directory : 50 Average filename and dirname length : 50 char Size of a hash : 20B
AverageFileSize = 1*1024^4 / 50'000 = 21MB Sha1Size = floor(AverageFileSize / 32MB) * 20 * 50'000 = 1 * 20 * 50'000 = 977kB FilenameSize = 50'000 * 50 * 2 = 4.8MB (2 bytes per char) DirnameSize = (50'000 / 50) * 50 * 2 = 97kB TotalSize = 977kB + 4.8MB + 97kB = 5.9MB
Configuration file¶
TODO..
Updated by Greg Burri about 15 years ago · 5 revisions