From: Nick Dokos <ndokos@gmail.com>
To: emacs-orgmode@gnu.org
Subject: Re: Get =#+RESULTS= without re-evaluating source code block?
Date: Tue, 02 Feb 2021 15:02:08 -0500 [thread overview]
Message-ID: <875z3az1a7.fsf@alphaville.usersys.redhat.com> (raw)
In-Reply-To: m28s87i5i8.fsf@andrew.cmu.edu
John Kitchin <jkitchin@andrew.cmu.edu> writes:
> I discovered that it matters a lot which block you cache. You have to
> cache the long running block. I had put cache on the block with noweb
> expansion, and then the long running block still runs every time. That
> was a surprise to me, since nothing was changing in that block, so I
> thought it would just use the cached result.
>
Just to elaborate a bit: Org mode checks whether to reevaluate a cached block
by checksumming it and seeing if the sum is different from before. That's why
you have to mark the actual block for caching, not its callers.
--
Nick
"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler
next prev parent reply other threads:[~2021-02-02 20:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-27 22:14 Get =#+RESULTS= without re-evaluating source code block? doltes
2021-01-27 22:38 ` tomas
2021-01-27 23:31 ` John Kitchin
2021-01-28 3:26 ` Greg Minshall
2021-02-02 2:10 ` John Kitchin
2021-02-02 20:02 ` Nick Dokos [this message]
2021-01-27 23:33 ` doltes
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