Testing of different cloning methods

Our objective is to find the least-consuming method in terms of memory and bandwidth resources. We are interested in cloning one specific state of the repository. We are not interested in its history or the possibility to change it from the server where it has been cloned. The first step is done by the script creation_repo.sh which creates an adequate repository to act as a local remote. The testing in itself is done by performance_tests.sh.

Creation of the test repository

The script creation_repo.sh creates a remote/performance_testing repository. NAME creation_repo.sh SYNOPSIS creation_repo.sh [-h] [-s] DESCRIPTION This script creates a ./remote directory in the current directory, then creates a remote/performance_testing git repository. This git repository is filled with randomly generated binary files described in the readme.md. OPTIONS -h prints the help. -s creates a submodule remote/submodule_for_performance_testing and includes it in remote/performance_testing. "

Here is a history of the commits: ### branch main commit sample0 1M created (tag: start) commit sample1 1M created commit sample3 1M created commit sample4 5M created commit sample4 5M deleted [if -s is selected] commit adding submodule_for_performance_testing module ### branch secondary commit sample0 1M created commit sample1 1M created commit sample2 500K created

Which gives the latest state:

branch main

sample0 1M sample1 1M sample3 1M ### branch secondary sample0 1M sample1 1M sample2 500K

If the -s option is selected, submodule_for_performance_testing is created with this history of commits:

branch main

commit first 1M sample created

which gives the latest state:

branch main

sub_sample0

Testing

The script performance_tests.sh measures memory and bandwidth usage for different git commands. It sources the script driglibash-base. It executes creation_repo.sh in order to have an adequate repository to test on. NAME performance_tests.sh SYNOPSIS performance_tests.sh [-a] [-h] [-n number] OPTIONS -a excutes all the tests. -n number executes test number -h prints the help. DESCRIPTION This script allows you to measure memory and bandwidth usage. The first five test different cloning methods. Te following apply changes to the local remote before testing fetching and merging commands. TEST0: classic cloning TEST1: --single-branch cloning TEST2: --depth=1 --no-single-branch cloning TEST3: --depth=1 cloning TEST4: --depth=1 with reflog and gc cloning TEST5: sparse-checking 1M sample0 cloning _________________ TEST6: classic fetching+checking out after addition of a 1M file TEST7: classic fetching+checking out after removal of a 1M file TEST8: classic fetching+checking out after addition then removal of a 1M file

TEST9: --depth=1 fetching+checking out after addition of a 1M file
TEST10: --depth=1 fetching+checking out after removal of a 1M file
TEST11: --depth=1 fetching+checking out after addition then removal of 1M a file

TEST12: --depth=1 fetching+checking out with reflog annd gc after addition of a 1M file
TEST13: --depth=1 fetching+checking out with reflog annd gc after removal of a 1M file
TEST14: --depth=1 fetching+checking out with reflog annd gc after addition then removal of a 1M file

TEST15: --depth=1 fetching+ --reset=hard after addition of a 1M file
TEST16: --depth=1 fetching+ --reset=hard after removal of a 1M file
TEST17:  --depth=1 fetching+ --reset=hard after addition then removal of a 1M file

TEST18: --depth=1 fetching+ --reset=hard and reflog and gc after addition of a 1M file
TEST19: --depth=1 fetching+ --reset=hard and reflog and gc after removal of a 1M file
TEST20: --depth=1 fetching+ --reset=hard and reflog and gc after addition then removal of a 1M file

TEST21: --depth=1 fetching+checking out after addition of a 1M file in submodule
TEST22: --depth=1 fetching+checking out after removal of a 1M file in submodule
TEST23: --depth=1 fetching+checking out after addition then removal of a 1M file in submodule 

TEST24: --depth=1 fetching+merging -X theirs with reflog and gc after addition of a 1M file
TEST25: --depth=1 fetching+merging -X theirs with reflog and gc after removal of a 1M file
TEST26: --depth=1 fetching+merging -X theirs with reflog and gc after addition then removal of a 1M file

TEST27: --depth=1 fetching+merging -s ours with reflog and gc after addition of a 1M file
TEST28: --depth=1 fetching+merging -s ours with reflog and gc after removal of a 1M file
TEST29: --depth=1 fetching+merging -s ours with reflog and gc after addition then removal of a 1M file"