Analysis of the size of the tar.gz file Done on the basis of gonze/7.2.1-training/329 (generated March 21, 2013). ls -l gives 63 598 552 bytes. gunzip + ls -l gives 266 035 200 bytes. gunzip + tar -xvf + du -s gives 537904 (512 bytes blocks = 275 406 848 bytes) gunzip + tar -xvf + tar -cvf + ls -l gives 272 933 376 bytes. gunzip + tar -xvf + tar -cvf + gzip + ls -l gives 65 238 747 bytes. gunzip + tar -xvf + tar -cvf + gzip + gunzip + ls -l gives again 272 933 376 bytes. gunzip + tar -xvf + tar -cvf + gzip + gunzip + tar -xvf + du -s gives again 537904 (512 bytes blocks = 275 406 848 bytes) Analysis of the 275 406 848 byte 7.2.1 directory. (du -s inside the directory) For the total of 537904 blocks one has the major contributions from : 348800 tests (64.8%) 95336 doc (17.7%) 66880 src (12.4%) 9184 gui (1.7%) 8288 fallbacks(1.5%) 3328 config (0.6%) 2168 configure(0.4%) 1752 util (0.3%) 535736 total major (99.6%) Analysis of the tar.gz file (65 238 747 bytes.) Tar then zip the corresponding dirs 35168436 tests (53.9%) 18772061 doc (28.8%) 5935460 src (9.1%) 960298 gui (1.5%) 3645507 fallbacks (5.6%) 219572 config (0.3%) 144465 configure (0.2%) 160029 util (0.2%) 65005828 total major (99.6%) Analysis of older version (du -s inside the directory) Keep only > 5000 ABINITv6.10.3 (December 2011) 93176 doc 7024 fallbacks 8768 gui 54352 src 359912 tests -rw-r--r-- 1 gonze staff 18992974 Apr 15 13:29 doc.tar.gz -rw-r--r-- 1 gonze staff 3485417 Apr 15 13:29 fallbacks.tar.gz -rw-r--r-- 1 gonze staff 876786 Apr 15 13:30 gui.tar.gz -rw-r--r-- 1 gonze staff 4639369 Apr 15 13:30 src.tar.gz -rw-r--r-- 1 gonze staff 44062888 Apr 15 13:30 tests.tar.gz ABINITv6.8.2 -rw-r--r-- 1 gonze staff 8281451 Apr 27 15:50 doc.tar.gz -rw-r--r-- 1 gonze staff 5302902 Apr 27 15:51 src.tar.gz -rw-r--r-- 1 gonze staff 28666233 Apr 27 15:51 tests.tar.gz The increase is due to the ABINIT school on parallelism in Bruyeres-le-Chatel. One should clean the corresponding dirs ... In particular, doc/tutorial/theory_mbt contains many large .svg files . (doc/tutorial/theory_mbt accounts for 4.0MB in the tar.gz file) and tests/Psps_for_tests contains many large pseudopotential files (that account for 13.9 MB in the tar.gz file)