Tips: Saving local disk space when cloning
Magnus Ihse Bursie
magnus.ihse.bursie at oracle.com
Wed Nov 22 09:15:08 UTC 2017
I'd like to propagate a tips I got from Erik. If you have a recent
enough mercurial, you can save some significant local disk space by
applying Mercurials "aggressive merge" algorithm when cloning. This
brings down the .hg directory from 1.6 GB to 1.1 GB. While disk is cheap
these days, SSD:s on laptops are still quite limited (at least mine
is!), and if you have multiple repos cloned, these gigabytes add up. The
only downside is that the conversion takes quite some time (~1 hour).
To achieve this, use the following command line when cloning:
hg --config=format.generaldelta=1 --config=format.aggressivemergedeltas=1 clone --pull http://hg.openjdk.java.net/jdk/jdk jdk
If you have already made a local clone and want to avoid re-downloading
it, you can make a "lean" clone from your local "fat" clone, and then
remove the fat clone:
hg --config=format.generaldelta=1 --config=format.aggressivemergedeltas=1 clone --pull jdk-fat jdk-lean
If you want a second lean clone, you can just clone that normally ("hg
clone jdk-lean jdk-lean2") and benefit from mercurials hard linking
facilities.
Apparently there were some technical reasons why this could not been
enabled by default on our hg.openjdk.java.net server. :-( But at least
you can apply this for yourself, if disk space is a premium.
/Magnus
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