[development] Refresh rather than re-create D6 cache

Tomáš Fülöpp (vacilando.org) tomi at vacilando.org
Mon Oct 18 10:41:21 UTC 2010

Not all caches would *have* to be re-populated at the same time.

Currently, if many or all caches get empty, they need to be re-populated on
request, extending the script execution. On a busier site other requests are
waiting because the first request is still not finished re-populating
caches. Eventually, Apache's maximum number of connections may be reached.

In the scenario I am considering, expired caches would not be emptied, so
they would continue serving (slightly older) data fast, and they would be
refreshed gradually (e.g. one cache per request).


On Mon, Oct 18, 2010 at 12:25, Chris Skene <chris at xtfer.com> wrote:

> What would be the practical difference between emptying and recreating a
> cache, and refreshing it?
> On 18/10/2010, at 9:22 PM, Tomáš Fülöpp (vacilando.org) wrote:
> Hi,
> In D6, after all caches are cleared, or after a lot of them expire and get
> emptied by cron, the server load spikes seriously because all such caches
> need to be re-populated.
> Since this happens more and more on sites I work on, I have been thinking
> about using another approach in my modules, in the sense that caches would
> be *refreshed* rather than cleared and re-populated. Each cache refresh
> would run depending on e.g. a simple variable storing last time stamp of any
> other cache refresh.
> This would assure that a) all cached values would be available at all
> times, b) caches would never be re-calculated all at the (near) same time.
> I am about to write logic for this, but wanted to first check with others
> in the list -- perhaps some of you know or can point to an elegant solution
> that already exists.
> Thanks!
> vacilando
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