hi every body i want to check system performance i usually use glance,top,sar and swapinfo but i confused in something so i need explanation about memory issue
first i want check the memory usage i used glance i found this parameter so i need one shows me the differences between these parameters
actually the physical memory 6 giga and the free 4.5 i understand that but need to understand what is the "Active VM: 560mb" and "Total VM : 810mb"
and are these parameters belong to swap
i run
and with glance i found swap space and swap pesudo
also i need to understand the "pseudo-swap" i found this statement in book but don't understand "if we have 1 giga memory and 1 giga swap we can run 1.75 g processes "
ok if we don't have the pseudo-swap how much processe in this situation 1 G ? i am asking
the proplem i face i don't know the tool that tell me the accurate percentage of free memory
1- glance tell you when press "m"
Phys Mem : 6.0gb Free Mem: 4.5gb
2- glance tell you when press "w"
pseudo-swap memory 6.0gb 839mb
so from this statement we can say memory free is 6 - 839 say (1G) so the result is free memory 5 giga i don't know what is the true "4.5" or "5"
3- when use swapinfo -mat
so if we choose the memory + reserve we find the memory total 6 G and the user ( 503 + 839 ) = 1342 G and the free is ( 6 - 1342 ) so the result is 4802 G
so what is the true and acurate i am confused
i hope any one help me to understand what is the prarmeters i must take care about .
many thanks .
Last edited by jim mcnamara; 08-03-2010 at 08:03 AM..
Reason: Remove duplicate sentences
"also I need to understand the "pseudo-swap" i found this statement in book but don't understand "if we have 1 giga memory and 1 giga swap we can run 1.75 g processes "
ok if we don't have the pseudo-swap how much processe in this situation 1 G ? i am asking "
When a process is created, swap is checked too see if there is enough swap space for that process. The swap space is not actually allocated at that moment.
So, if you have 1 GB of RAM and 1 GB of swap space and you want to start a 1,5 GB process on a system that does not have pseudo-swap activated, you will not be able to start that process.
If you have pseudo-swap active, meaning 1 GB of swap space and [up to] 75% of 1 GB RAM results in 1,75 GB "virtual" swap space, you will be able to start that 1.5 GB process.
In HP-UX 11 v1 and v2 pseudo-swap is controlled by this kernel parameter: swapmem_on (1 is on). In 11.3, pseudo-swap is always enabled and swapmem_on parameter is no longer present.
hope it's more clear now the pseudo-swap space concept.
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