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git:issues [2018/07/30 09:51] – niziakgit:issues [2023/07/17 16:02] (current) – niziak
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-====== reduce repo size ======+====== Issues ====== 
 + 
 +====== fsck: dangling commit ===== 
 + 
 +List details about dangling commits ([[https://lukescott.co/2019/05/10/git-finding-lost-dangling-commits/|Git – Finding Lost/Dangling Commits]]:
 <code bash> <code bash>
 +git fsck --lost-found | grep "^dangling commit" | sed "s/^dangling commit //g" | xargs git show -s --oneline
 +</code>
 +
 +Cleanup:
 +<code bash>
 +git reflog expire --expire=now --all
 +git gc --prune=now --aggressive
 +git repack -a -d
 +</code>
 +
 +====== Reduce repo size ======
 +
 +
 +It is important to check if git configured with default settings.
 +Especially forcing of creation of multiple smaller packs significantly increases repository size.
 +I.e. changing one 1.2G pack into multiple 256MB packs let, increases size of packs to 4.3GB :(
 +<code bash>
 +git config --global -l
 +git config --system -l
 +</code>
 +
 +Especially take attention for options like:
 +  *  deltaCacheSize = 10m
 +  *  packSizeLimit = 10m
 +  *  windowMemory = 10m
 +
 +
 +Command <code bash>git gc</code> and other cleaning commands requires whole repository to be read into memory. For big repos (like kernel.git) it requires to allocate over 8GB of RAM.
 +Compression of objects is also performed in RAM, then packs are written onto disc.
 +[[https://stackoverflow.com/questions/42175296/git-gc-uses-a-lot-of-memory-even-i-limited-it]]
 +
 +
 +To prevent touching existing packs and exhaust system memory paramter ''auto'' should be used. <code bash>git gc --auto</code>
 +Another possibility is to mark some packs as ''keep'' by creating .keep files. 
 +
 +Remove unreachable objects:
 +<code bash>
 +
 +git count-objects -v
 +git gc  --auto # this is enough to remove loose objects and repack repo
 +git count-objects -v
 +
 +# more instruction
 +git repack -Ad # Remove dangling objects from packfiles
 +git prune # Remove dangling loose objects
 +git gc --aggressive --prune=now --force  || rm -f .git/objects/*/tmp_* && rm -f .git/objects/*/.tmp-*
 +
 git count-objects -v git count-objects -v
-git gc --aggressive --prune 
 </code> </code>
 +
 +
  
 ====== error: pack-objects died of signal 9  ====== ====== error: pack-objects died of signal 9  ======