Hello:

I described a problem earlier this month that has been plaguing the site ( http://librepathology.org ) I am running.

The short version is: - I am using the InstantCommons feature of MediaWiki. - Intermittently, the images on the site are disappearing. - Unusual about it is that the images pages that are created when MediaWiki pulls an image from the WikiCommons seem to disappear too. - It resolves shortly after I reboot the server. - It has happened a couple of times in the past few weeks... but not before that.

Context: - It does not have a clear relation to server load, i.e. the images do not disappear only when the loading is high. - It has been my observation that free (physical) memory (shown using the unix command 'top') is still available but low when problems are happening. I do have a swap partition configured.

What I have done: - Upgraded RAM to 2 GB (from 1 GB) - Removed backup files from the server -- so I have ~15% free space. - Tried to block a high bandwidth robot with robots.txt - Looked through log files... no sure where to look though. - I have taken down a citation generator that I installed a few weeks before this all started.

I think the problem lies in the memory management.

The "memory_limit" variable in "php.ini" (/etc/php5/apache2/php.ini) is '128M'. I do have caching enabled in LocalSettings.php ( $wgMainCacheType = CACHE_ACCEL; ) but not otherwise.

I ran the site similarly configured over a year behind a login... without anything like this happening.

At the bottom is output from 'cat /proc/meminfo' taken at time the images were broken.

Any thoughts/suggestions would be appreciated.

Thanks, Michael

---------------------------------- MemTotal: 2012148 kB MemFree: 89368 kB Buffers: 230104 kB Cached: 1098764 kB SwapCached: 120 kB Active: 900608 kB Inactive: 779988 kB Active(anon): 256448 kB Inactive(anon): 128280 kB Active(file): 644160 kB Inactive(file): 651708 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 1113084 kB SwapFree: 1111164 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 351628 kB Mapped: 54936 kB Shmem: 33000 kB Slab: 218796 kB SReclaimable: 208732 kB SUnreclaim: 10064 kB KernelStack: 792 kB PageTables: 8144 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2119156 kB Committed_AS: 783648 kB VmallocTotal: 34359738367 kB VmallocUsed: 9140 kB VmallocChunk: 34359728411 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 40948 kB DirectMap2M: 2007040 kB