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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



  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 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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