MobileRead Forums - View Single Post

Mackx · 06-28-2010, 01:48 PM

To protect xournal from memory overflows I try to determine how much memory is free at the moment that a file is opened in xournal. I am using the output of the /proc/meminfo, but it is confusing me. I browsed some time on the internet, and I could only find what the individual field mean, but not how to determine the actual amount of free memory.
The output looks like this (on the emulator):

Code:

MemTotal:       126796 kB
MemFree:         71936 kB
Buffers:          1508 kB
Cached:          29148 kB
SwapCached:          0 kB
Active:          33464 kB
Inactive:        15316 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:             528 kB
Writeback:           0 kB
AnonPages:       18152 kB
Mapped:          11740 kB
Slab:             3408 kB
SReclaimable:     1452 kB
SUnreclaim:       1956 kB
PageTables:        680 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:     63396 kB
Committed_AS:    35876 kB
VmallocTotal:   253952 kB
VmallocUsed:      4596 kB
VmallocChunk:   241660 kB

I know that linux is 'lazy' in releasing memory, so I need to know the free memory and that part that is ready to be freed. The description of Active: and Inactive: tells that it is memory that is ready to be freed. But it sums up to about 120MB which would mean that only 8MB is used after the DR is started.
I think that I make a mistake, but where did I make it?

Thanks,
Marcel.

06-28-2010, 01:48 PM	#1
Mackx Guru Posts: 999 Karma: 19985 Join Date: Dec 2008 Location: Netherlands Device: iRex DR1000S	Available memory on DR To protect xournal from memory overflows I try to determine how much memory is free at the moment that a file is opened in xournal. I am using the output of the /proc/meminfo, but it is confusing me. I browsed some time on the internet, and I could only find what the individual field mean, but not how to determine the actual amount of free memory. The output looks like this (on the emulator): Code: MemTotal: 126796 kB MemFree: 71936 kB Buffers: 1508 kB Cached: 29148 kB SwapCached: 0 kB Active: 33464 kB Inactive: 15316 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 528 kB Writeback: 0 kB AnonPages: 18152 kB Mapped: 11740 kB Slab: 3408 kB SReclaimable: 1452 kB SUnreclaim: 1956 kB PageTables: 680 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 63396 kB Committed_AS: 35876 kB VmallocTotal: 253952 kB VmallocUsed: 4596 kB VmallocChunk: 241660 kB I know that linux is 'lazy' in releasing memory, so I need to know the free memory and that part that is ready to be freed. The description of Active: and Inactive: tells that it is memory that is ready to be freed. But it sums up to about 120MB which would mean that only 8MB is used after the DR is started. I think that I make a mistake, but where did I make it? Thanks, Marcel.