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Ram and
Server Performance. |
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How Does Random Access Memory (RAM) Affect Server
Performance?
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RAM Memory is a high speed electronic storage
for instructions and data that is accessed and acted on by the
processor subsystem and certain I/O devices. Memory is generally
governed by the
CPU/chipset combination and, due to its
influence on system performance is designed to meet two key
criteria. The first criterion is memory access speed determined
by the data width, access time, and cycle time; the second
criterion is reliability. |
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Applications are loaded into system memory, and many software
environments utilize different forms of caching in memory to improve
overall performance. The processing subsystem utilizes the system memory
as an external cache and is dependent on the access speed of the memory
when accessing this cache and the available on-die processor cache that
may minimize external calls. The memory bus speed determines the base
speed of memory access. Further improvements in access speed may be
realized by writing data in parallel to different memory addresses
improving overall system performance. Correctly calculating the amount
of memory required for a specific server application is vital as many
operating systems utilize the hard drive subsystem to compensate for
requirements in excess of available memory. The performance penalties
incurred by insufficient memory are extreme considering the vast
difference between disk and memory data access speeds.
The core of the server system is extremely sensitive to data corruption,
and data errors in the memory subsystem can cause a server operating
system or application to hang. Memory with error correcting code (ECC)
is utilized in server systems to correct single-bit memory errors and
detect multiple bit errors found in a memory chip. By reporting errors
to the management subsystem, faulty memory generating single-bit errors
can be corrected, preventing critical server failure. It is therefore
highly recommended that servers use ECC memory. Non-ECC memory is
considered acceptable for network appliances and desktop computers.
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