[Koha] Please advice how to improve our search issue

[Paul]

At 06:10 PM 4/8/2013 -0700, zoe wrote:
>$ free -m  output
>
>              total       used       free     shared    buffers     cached
>Mem:          1955       1881         73          0         15       1350
>-/+ buffers/cache:        514       1440
>Swap:         2997          2       2995

That looks like a very busy, if not overloaded, server. You need (at least) 
to increase the size of your swap to at least double what it is currently 
set at (either resize partition or add a swapfile.) Here's my sandbox (odd 
memory size comes from proprietorial hardware, but it's close to yours) 
running Koha on Ubuntu, with MemCache:

$ free -m
              total       used       free     shared    buffers     cached
Mem:          2379        463       1916          0         82        178
-/+ buffers/cache:        202       2177
Swap:         3999          0       3999

Best - Paul