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




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