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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.


"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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