With a considerable number of webmasters switching to Virtual Private Servers (VPS) from shared hosting these days and preferring them over costlier fully dedicated servers, memory and resource optimization has become a burning issue. Most VPS packages being bought these days, have dedicated memory constraints of 128MB to 256MB. Apache and MySQL are known to be the most memory (resource) intensive applications that tend to crash or slow down a low to mid range VPS often. While OpenVZ or Virtuozzo based VPSs can have a burst memory limit in addition to the dedicated RAM to quench occassional high memory needs, Xen based VPSs cannot use more than the stipulated amount of dedicated RAM, adding to the problem.
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