[Re-posting to the list.]
Is there anything in the Apache error_log?
Does it happen when you edit pages, or when you only read pages of your
wiki? Does it happen to specific pages, or not? Does it always happen to
the specific pages, or sometimes it happens, sometimes it doesn't for
the same page?
Have you enabled some recipes? Does the problem still appear when the
recipes are disabled?
Do you have some complex wiki markups like embedded pagelists? Pagelists
are not really designed to be embedded in other pagelists (there is a
global $Cursor variable which may get overwritten and lead to infinite
loops and crashes). If that's the case, there is no easy solution.
Do you have complex page text variables (PTVs) containing other page
text variables, or containing markup expressions, or conditionals? It is
possible that at some point there is an infinite loop which consumes all
the CPU/RAM resources of the server. Recent PmWiki versions try to
detect the embedded PTVs and exit the infinite loops, but there might be
something it fails to detect.
The automatic tasks that PmWiki does from time to time are:
- updating the wiki.d/.pageindex file for faster searches, this might
rarely cause high CPU/RAM usage, if your files reside on a network hard
drive attached to the server;
- retrieving the blocklists from the internet, this might rarely cause
high CPU/RAM usage if your server doesn't have a stable/fast incoming
internet connection
- processing the blocklists: look at the downloaded blocklist pages (in
SiteAdmin/): if they look like HTML, try disabling those blocklists. In
the past blocklist providers have dropped their websites so wikis were
getting content from some cybersquatters which was not adapted for the
blocklist engine.
There may be more cases, but as you can imagine, intermittent errors are
hard to debug.
Petko
On 08.10.2014 19:26, Randy Brown wrote:
For the past few weeks, all the wikis I've tested have developed an
occasional problem: when pmwiki.php is running, the server runs out of
virtual memory and is unable to create a child process. I get an
"Internal Server Error" message. It seems to occur for anywhere from a
few minutes at a time to a few hours, and during that time if I keep
trying I'll get a certain percentage of successful response - it can
range mostly successful to rarely successful.
My web host says that when they accessed one site my account suddenly
went from 0 to 100% virtual memory usage.
The problem occurs even on websites that I haven't changed for months.
When it's happening to one site, it's happening to the others too.
I've tried adjusting in php.ini the max_memory allowed, both up and
down, with no effect.
I get the problem even when I block all IP addresses except for my
own.
The only theory I can think of is that some cron job that PmWiki runs
in background, such as blocklist, is starting to consume tons of
memory for reasons unknown. But I would think that such an issue would
affect lots of websites, not just mine, and I haven't seen this
problem reported before, so it seems unlikely.
Any theories that might help me track down the cause of this?
Randy
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