also wondering if there is a way I can list Active memory map showing me what is cached?
-regards. On Tue, Sep 22, 2015 at 3:08 PM, Prem Kumar <[email protected]> wrote: > Dear All, > > I have done quite a bit of reading on Active memory reported in > /proc/meminfo and in short says it is never reclaimed unless absolutely > necessary, and it caches the recently used files/pages in memory. Although > I fail to understand the consequences that I face here. > > I have disk-less and swap-less nodes. So all I have to do, is play with > the RAM on the box. Issue that brought me here is investigating why after > running some applications, used memory is never available for use with any > other applications. > > In other words I cannot run any programs that requests memory more than > what is shown as free in the output of free command and MemFree in the > output of the cat /proc/meminfo > For example if I ran any program that requires more than 6GB on the first > node below and more than 1GB on the second node below they fail instantly, > and work fine if within the limist of free. There is nothing else running > on the system other than system processes/services. > > total used free shared buffers cached > Mem: 23 17 6 0 0 9 > -/+ buffers/cache: 8 15 > Swap: 0 0 0 > > total used free shared buffers cached > Mem: 23 22 1 0 0 0 > -/+ buffers/cache: 21 1 > Swap: 0 0 0 > > Since the applications that ran previously are not running any more "even > though they died out of memory because they requested more memory than > available", shouldn't the OS see that any memory used previously as useless > and can it not reclaim that for use with the next job/program on that > machine. > > On every machine that I have run into this problem the out put of > /proc/meminfo shows that Active memory is used up the amount shown in the > free command and limits my further runs. > > This is driving me insane and making me feel stupid knowing that OS is > smart enough to handle this, then what am I missing here to understand? > Please advise. > > Appreciate any insight into this. > > Best Regards, > Prem > > >
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