Actions
Persistent data » History » Revision 4
« Previous |
Revision 4/18
(diff)
| Next »
Greg Burri, 07/21/2009 01:33 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.
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 over 15 years ago · 4 revisions