Quote:
Originally Posted by rajini23
i have a doubt that if i increase the "Ram" to 8GB should i want to increase the "Swap" space also...
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How will the workload change after the ram increase?
If you plan to run the same workload (increasing ram just to make that workload run faster) then the increase in ram decreases the need for swap. (For swap size decisions, doing more work sequentially, because the system is faster, is not a higher workload. Only doing more work simultaneously is a higher workload).
If you plan to increase the workload (run more simultaneously or larger of whatever services or applications are running) when you increase the amount of ram, then that may call for an increase in swap as well.
Quote:
Originally Posted by rajini23
can i able increase RAM 8GB in 32bit
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If your hardware supports 8GB, then a Centos 32bit PAE kernel supports 8GB.
If you have a non PAE kernel in 32 bit Centos, it is easy to switch to a PAE kernel (install the package and reboot). It is much harder to switch to a 64 bit kernel. A 64 bit kernel might be better or worse for your purposes than PAE (better is more likely, but it is hard to predict). 64bit is not likely to be enough better to be worth the extra trouble of switching.