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Forum is becoming UNUSABLE - something must be done!

Posted by dc42 
Re: Forum is becoming UNUSABLE - something must be done!
April 22, 2016 02:05AM
The problem has lessened consideraby since I started this thread. I rarely get the 'Bad Gateway' errors these days, and I doubt that the forums have become less busy. My thanks to those who have made the changes that have improved things.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Forum is becoming UNUSABLE - something must be done!
October 21, 2016 03:26PM
Where is this site hosted?

Maybe move this site to [osuosl.org]
And upgrade/convert to phpBB 3.1 while at it?
Re: Forum is becoming UNUSABLE - something must be done!
January 27, 2018 05:13AM
The problems are back. I am finding the forum v-e-r-y slow and getting frequent 502 Bad Gateway errors.


Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
VDX
Re: Forum is becoming UNUSABLE - something must be done!
January 27, 2018 06:21AM
... I've emailed Adrian but didn't get an answer yet eye rolling smiley


Viktor
Re: Forum is becoming UNUSABLE - something must be done!
January 29, 2018 11:41AM
Hi All. I don't administer the reprap.org server; other kind volunteers do that now that I am retired. I have just e-mailed them and we'll do our best to fix it speedily.
Re: Forum is becoming UNUSABLE - something must be done!
January 31, 2018 04:42AM
It should be better now. I attach the diagnosis and cure from one of the admins.

Best wishes

Adrian

--------------------------------------------------------------------------------------------------------------

I took a look. I noticed very high disk I/O on the /data drive.
Some aggressive web-spiders were crawling the rss feeds and individual posts,
causing them to be re-cached, and bloating the size of the on-disk cache.

The cached files are stored in a directory hierarchy that's based on the
32-character md5 hash of the key, split into 3-character segments, so
each cache hit(or miss) would cause over 13 stat() calls to hit the disk.

I patched the forums/htdocs/includes/cache/file.php code to split the
hash into 3 segments that are 3, 3, and 26 characters long, so that the cache
directory hierarchy is 3 directories deep, instead of 11.

Blocking the worst of the web web-spiders combined with the shallower cache-tree
has brought the disk I/O back down to sane levels, and forums are loading faster.
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